// ================================================================
// $Id: environ.cpp,v 1.1 2004/02/16 14:45:59 bittner Exp $
//
// environ.cpp
//     Implementation of the environment operations, ie. reading
//     environment file, reading command line parameters etc.
//

//#define _DEBUG_PARAMS

#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fstream>

#include "gzstream.h"
#include "common.h"
#include "Environment.h"
#include "Vector3.h"

  
Environment *environment = NULL;

Environment::~Environment()
{
  int i, j;

  // delete the params structure
  for (i = 0; i < numParams; i++) {
    for (j = 0; j < paramRows; j++)
      if (params[i][j] != NULL)
	delete[] params[i][j];
    if (params[i] != NULL)
      delete[] params[i];
  }

  if (params != NULL)
    delete[] params;
  
  // delete the options structure
  if (options != NULL)
    delete[] options;
  
  if (optionalParams != NULL)
    delete optionalParams;
}

bool
Environment::CheckForSwitch(const int argc,
							char **argv,
							const char swtch) const
{
  for (int i = 1; i < argc; i++)
    if ((argv[i][0] == '-') && (argv[i][1] == swtch))
      return true;
  return false;
}

bool
Environment::CheckType(const char *value,
			const EOptType type) const
{
  char *s, *t, *u;

  switch (type) {
    case optInt: {
      strtol(value, &t, 10);
      if (value + strlen(value) != t)
        return false;
      else
        return true;
    }
    case optFloat: {
      strtod(value, &t);
      if (value + strlen(value) != t)
        return false;
      else
        return true;
    }
    case optBool: {
      if (!strcasecmp(value, "true") ||
          !strcasecmp(value, "false") ||
          !strcasecmp(value, "YES") ||
          !strcasecmp(value, "NO") ||
          !strcmp(value, "+") ||
          !strcmp(value, "-") ||
          !strcasecmp(value, "ON") ||
          !strcasecmp(value, "OFF"))
        return true;
      return false;
    }
    case optVector:{
      strtod(value, &s);
      if (*s == ' ' || *s == '\t') {
        while (*s == ' ' || *s == '\t')
          s++;
        if (*s != ',')
          s--;
      }
      if ((*s != ',' && *s != ' ' && *s != '\t') || value == s)
        return false;
      t = s;
      strtod(s + 1, &u);
      if (*u == ' ' || *u == '\t') {
        while (*u == ' ' || *u == '\t')
          u++;
        if (*u != ',')
          u--;
      }
      if ((*u != ',' && *s != ' ' && *s != '\t') || t == u)
        return false;
      t = u;
      strtod(u + 1, &s);
      if (t == s || value + strlen(value) != s)
        return false;
      return true;
    }
    case optString: {
      return true;
    }
    default: {
      Debug << "Internal error: Unknown type of option.\n" << flush;
      exit(1);
    }
  }
  return false;
}

void
Environment::ReadCmdlineParams(const int argc,
							   char **argv,
							   const char *optParams)
{
  int i;

  // Make sure we are called for the first time
  if (optionalParams != NULL)
    return;

  numParams = (int)strlen(optParams) + 1;
  optionalParams = new char[numParams];
  strcpy(optionalParams, optParams);

  // First, count all non-optional parameters on the command line
  for (i = 1; i < argc; i++)
    if (argv[i][0] != '-')
      paramRows++;

  // if there is no non-optional parameter add a default one...
  if (paramRows == 0)
    paramRows = 1;
  
  // allocate and initialize the table for parameters
  params = new char **[numParams];
  for (i = 0; i < numParams; i++) {
    params[i] = new char *[paramRows];
    for (int j = 0; j < paramRows; j++)
      params[i][j] = NULL;
  }
  // Now read all non-optional and optional parameters into the table
  curRow = -1;
  for (i = 1; i < argc; i++) {
    if (argv[i][0] != '-') {
      // non-optional parameter encountered
      curRow++;
      params[0][curRow] = new char[strlen(argv[i]) + 1];
      strcpy(params[0][curRow], argv[i]);
    }
    else {
      // option encountered
      char *t = strchr(optionalParams, argv[i][1]);
      if (t != NULL) {
        // this option is optional parameter
        int index = t - optionalParams + 1;
        if (curRow < 0) {
          // it's a global parameter
          for (int j = 0; j < paramRows; j++) {
            params[index][j] = new char[strlen(argv[i] + 2) + 1];
            strcpy(params[index][j], argv[i] + 2);
          }
        }
        else {
          // it's a scene parameter
          if (params[index][curRow] != NULL) {
            delete[] params[index][curRow];
          }
          params[index][curRow] = new char[strlen(argv[i] + 2) + 1];
          strcpy(params[index][curRow], argv[i] + 2);
        }
      }
    }
  }
  curRow = 0;

#ifdef _DEBUG_PARAMS
  // write out the parameter table
  cerr << "Parameter table for " << numParams << " columns and "
       << paramRows << " rows:\n";
  for (int j = 0; j < paramRows; j++) {
    for (i = 0; i < numParams; i++) {
      if (params[i][j] != NULL)
        cerr << params[i][j];
      else
        cerr << "NULL";
      cerr << "\t";
    }
    cerr << "\n";
  }
  cerr << "Params done.\n" << flush;
#endif // _DEBUG_PARAMS
}

bool
Environment::GetParam(const char name,
		       const int index,
		       char *value) const
{
  int column;

  if (index >= paramRows || index < 0)
    return false;
  if (name == ' ')
    column = 0;
  else {
    char *t = strchr(optionalParams, name);

    if (t == NULL)
      return false;
    column = t - optionalParams + 1;
  }

  if (params[column][index] == NULL)
    return false;
  //  value = new char[strlen(params[column][index]) + 1];
  strcpy(value, params[column][index]);
  return true;
}

void
Environment::RegisterOption(const char *name,
			     const EOptType type,
			     const char *abbrev,
			     const char *defValue)
{
  int i;

  // make sure this option was not yet registered
  for (i = 0; i < numOptions; i++)
    if (!strcmp(name, options[i].name)) {
      Debug << "Error: Option " << name << " registered twice.\n";
      exit(1);
    }
  // make sure we have enough room in memory
  if (numOptions >= maxOptions) {
    Debug << "Error: Too many options. Try enlarge the maxOptions "
	  << "definition.\n";
    exit(1);
  }

  // make sure the abbreviation doesn't start with 'D'
  if (abbrev != NULL && (abbrev[0] == 'D' )) {
    Debug << "Internal error: reserved switch " << abbrev
         << " used as an abbreviation.\n";
    exit(1);
  }
  // new option
  options[numOptions].type = type;
  options[numOptions].name = strdup(name);
  // assign abbreviation, if requested
  if (abbrev != NULL) {
    options[numOptions].abbrev = strdup(abbrev);
  }
  // assign default value, if requested
  if (defValue != NULL) {
    options[numOptions].defaultValue = strdup(defValue);
    if (!CheckType(defValue, type)) {
      Debug << "Internal error: Inconsistent type and default value in option "
           << name << ".\n";
      exit(1);
    }
  }
  // new option registered
  numOptions++;
}

bool
Environment::OptionPresent(const char *name) const
{
  bool found = false;
  int i;

  for (i = 0; i < numOptions; i++)
    if (!strcmp(options[i].name, name)) {
      found = true;
      break;
    }
  if (!found) {
    Debug << "Internal error: Option " << name << " not registered.\n" << flush;
    exit(1);
  }
  if (options[i].value != NULL || options[i].defaultValue != NULL)
    return true;
  else
    return false;
}

int
Environment::FindOption(const char *name,
			const bool isFatal) const
{
  int i;
  bool found = false;
  // is this option registered ?
  for (i = 0; i < numOptions; i++)
    if (!strcmp(options[i].name, name)) {
      found = true;
      break;
    }
  if (!found) {
    // no registration found
    Debug << "Internal error: Required option " << name
	  << " not registered.\n" << flush;
    exit(1);
  }
  if (options[i].value == NULL && options[i].defaultValue == NULL)
    // this option was not initialised to some value
    if (isFatal) {
      Debug << "Error: Required option " << name << " not found.\n" << flush;
      exit(1);
    }
    else {
      Debug << "Error: Required option " << name << " not found.\n" << flush;
      return -1;
    }
  return i;
}

bool
Environment::GetIntValue(const char *name,
			 int &value,
			 const bool isFatal) const
{
  int i = FindOption(name, isFatal);

  if (i<0)
    return false;

  if (options[i].value != NULL) {
    // option was explicitly specified
    value = strtol(options[i].value, NULL, 10);
  } else {
    // option was not read, so use the default
    value = strtol(options[i].defaultValue, NULL, 10);
  }

  return true;
}

bool
Environment::GetDoubleValue(const char *name,
			    double &value,
			    const bool isFatal) const
{
  int i = FindOption(name, isFatal);

  if (i<0)
    return false;

  if (options[i].value != NULL) {
    // option was explicitly specified
    value = strtod(options[i].value, NULL);
  } else {
    // option was not read, so use the default
    value = strtod(options[i].defaultValue, NULL);
  }
  return true;
}

bool
Environment::GetRealValue(const char *name,
			  Real &value,
			  const bool isFatal) const
{
  int i = FindOption(name, isFatal);
  
  if (i<0)
    return false;

  if (options[i].value != NULL) {
    // option was explicitly specified
    value = (Real)strtod(options[i].value, NULL);
  } else {
    // option was not read, so use the default
    value = (Real)strtod(options[i].defaultValue, NULL);
  }
  return true;
}

bool
Environment::GetFloatValue(const char *name,
			   float &value,
			   const bool isFatal) const
{
  int i = FindOption(name, isFatal);

  if (i<0)
    return false;

  if (options[i].value != NULL) {
    // option was explicitly specified
    value = (float)strtod(options[i].value, NULL);
  } else {
    // option was not read, so use the default
    value = (float)strtod(options[i].defaultValue, NULL);
  }
  return true;
}

bool
Environment::GetBool(const char *name,
		     const bool isFatal) const
{
  bool ret;
  if (GetBoolValue(name, ret, isFatal))
    return ret;
  else
    return false;
}

bool
Environment::ParseBool(const char *name) const
{

  bool value = true;
  
  if (!strcasecmp(name, "false") ||
      !strcasecmp(name, "NO") ||
      !strcmp(name, "-") ||
      !strcasecmp(name, "OFF"))
    value = false;
  
  return value;
}

void
Environment::ParseVector(const char *name, Vector3 &v) const
{
  // option was not read, so use the default
  char *s, *t;
  
  v.x = (Real)strtod(name, &s);
  v.y = (Real)strtod(s + 1, &t);
  v.z = (Real)strtod(t + 1, NULL);

}

bool
Environment::GetBoolValue(const char *name,
			   bool &value,
			   const bool isFatal) const
{
  int i = FindOption(name, isFatal);

  if (i<0)
    return false;

  
  if (options[i].value != NULL) 
    value = ParseBool(options[i].value);
  else
    value = ParseBool(options[i].defaultValue);

  return true;
}

bool
Environment::GetVectorValue(const char *name,
			    Vector3 &v,
			    const bool isFatal) const
{
  int i = FindOption(name, isFatal);
  if (i<0)
    return false;

  if (options[i].value != NULL) 

    
  if (options[i].value != NULL) {
    ParseVector(options[i].value, v);
  }
  else {
    ParseVector(options[i].defaultValue, v);
  }
  return true;
}

bool
Environment::GetStringValue(const char *name,
			    char *value,
			    const bool isFatal) const
{
  int i = FindOption(name, isFatal);

  if (i<0)
    return false;

  
  if (options[i].value != NULL) {
    // option was not read, so use the default
    strcpy(value, options[i].value);
  }
  else {
    // option was explicitly specified
    strcpy(value, options[i].defaultValue);
  }
  return true;
}

void
Environment::SetInt(const char *name, const int value)
{

  int i = FindOption(name);
  if (i<0)
    return;

  if (options[i].type == optInt) {
    delete options[i].value;
    options[i].value = new char[16];
    sprintf(options[i].value, "%.15d", value);
  }
  else {
    Debug << "Internal error: Trying to set non-integer option " << name
	  << " to integral value.\n" << flush;
    exit(1);
  }
}

void
Environment::SetFloat(const char *name, const Real value)
{
  int i = FindOption(name);
  if (i<0)
    return;

  if (options[i].type == optFloat) {
    delete options[i].value;
    options[i].value = new char[25];
    sprintf(options[i].value, "%.15e", value);
  }
  else {
    Debug << "Internal error: Trying to set non-Real option " << name
	  << " to Real value.\n" << flush;
    exit(1);
  }
}

void
Environment::SetBool(const char *name, const bool value)
{
  int i = FindOption(name);
  if (i<0)
    return;

  if (options[i].type == optBool) {
    delete options[i].value;
    options[i].value = new char[6];
    if (value)
      sprintf(options[i].value, "true");
    else
      sprintf(options[i].value, "false");
  }
  else {
    Debug << "Internal error: Trying to set non-bool option " << name
	  << " to boolean value.\n" << flush;
    exit(1);
  }
}

void
Environment::SetVector(const char *name,
		       const Vector3 &v)
{
  int i = FindOption(name);
  if (i<0)
    return;

  if (options[i].type == optVector) {
    delete options[i].value;
    options[i].value = new char[128];
    sprintf(options[i].value, "%.15e,%.15e,%.15e", v.x, v.y, v.z);
  }
  else {
    Debug << "Internal error: Trying to set non-vector option " << name
	  << " to vector value.\n" << flush;
    exit(1);
  }
}

void
Environment::SetString(const char *name, const char *value)
{
  int i = FindOption(name);
  if (i<0)
    return;

  if (options[i].type == optString) {
    delete options[i].value;
    options[i].value = strdup(value);
  }
  else {
    Debug << "Internal error: Trying to set non-string option " << name
	  << " to string value.\n" << flush;
    exit(1);
  }
}

void
Environment::ParseCmdline(const int argc,
						  char **argv,
						  const int index)
{
  int curIndex = -1;

  for (int i = 1; i < argc; i++) {
    // if this parameter is non-optional, skip it and increment the counter
    if (argv[i][0] != '-') {
      curIndex++;
      continue;
    }
    // make sure to skip all non-optional parameters
    char *t = strchr(optionalParams, argv[i][1]);
    if (t != NULL)
      continue;

    // if we are in the scope of the current parameter, parse it
    if (curIndex == -1 || curIndex == index) {
      if (argv[i][1] == 'D') {
        // it's a full name definition
        bool found = false;
        int j;

        char *t = strchr(argv[i] + 2, '=');
        if (t == NULL) {
          Debug << "Error: Missing '=' in option. "
		<< "Syntax is -D<name>=<value>.\n" << flush;
          exit(1);
        }
        for (j = 0; j < numOptions; j++)
          if (!strncmp(options[j].name, argv[i] + 2, t - argv[i] - 2) &&
              (unsigned)(t - argv[i] - 2) == strlen(options[j].name)) {
            found = true;
            break;
          }
        if (!found) {
          Debug << "Warning: Unregistered option " << argv[i] << ".\n" << flush;
	  //  exit(1);
        }
	if (found) {
	  if (!CheckType(t + 1, options[j].type)) {
	    Debug << "Error: invalid type of value " << t + 1 << " in option "
		  << options[j].name << ".\n";
	    exit(1);
	  }
	  if (options[j].value != NULL)
	    delete options[j].value;
	  options[j].value = strdup(t + 1);
	}
      }
      else {
        // it's an abbreviation
        bool found = false;
        int j;
	
        for (j = 0; j < numOptions; j++)
          if (options[j].abbrev != NULL &&
              !strncmp(options[j].abbrev, argv[i] + 1, strlen(options[j].abbrev))) {
            found = true;
            break;
          }
        if (!found) {
          Debug << "Warning: Unregistered option " << argv[i] << ".\n" << flush;
	  //          exit(1);
        }
	if (found) {
	  if (!CheckType(argv[i] + 1 + strlen(options[j].abbrev), options[j].type)) {
	    Debug << "Error: invalid type of value "
		  << argv[i] + 1 + strlen(options[j].abbrev) << "in option "
		  << options[j].name << ".\n";
	    exit(1);
	  }
	  if (options[j].value != NULL)
	    delete options[j].value;
	  options[j].value = strdup(argv[i] + 1 + strlen(options[j].abbrev));
	}
      }
    }
  }
#ifdef _DEBUG_PARAMS
  // write out the options table
  cerr << "Options table for " << numOptions << " options:\n";
  for (int j = 0; j < numOptions; j++) {
    cerr << options[j];
    cerr << "\n";
  }
  cerr << "Options done.\n" << flush;
#endif // _DEBUG_PARAMS
}


char *
Environment::ParseString(char *buffer, char *string) const
{
  char *s = buffer;
  char *t = string + strlen(string);

  // skip leading whitespaces
  while (*s == ' ' || *s == '\t')
    s++;
  if (*s == '\0')
    return NULL;
  while ((*s >= 'a' && *s <= 'z') ||
         (*s >= 'A' && *s <= 'Z') ||
         (*s >= '0' && *s <= '9') ||
         *s == '_')
    *t++ = *s++;
  *t = '\0';
  // skip trailing whitespaces
  while (*s == ' ' || *s == '\t')
    s++;
  return s;
}

const char code[] = "JIDHipewhfdhyd74387hHO&{WK:DOKQEIDKJPQ*H#@USX:#FWCQ*EJMQAHPQP(@G#RD";

void
Environment::DecodeString(char *buff, int max)
{
  buff[max] = 0;
  char *p = buff;
  const char *cp = code; 
  for (; *p; p++) {
    if (*p != '\n')
      *p = *p ^ *cp;
    ++cp;
    if (*cp == 0)
      cp = code;
  }
}

void
Environment::CodeString(char *buff, int max)
{
  buff[max] = 0;
  char *p = buff;
  const char *cp = code; 
  for (; *p; p++) {
    if (*p != '\n')
      *p = *p ^ *cp;
    ++cp;
    if (*cp == 0)
      cp = code;
  }
}

void
Environment::SaveCodedFile(char *filenameText,
			    char *filenameCoded)
{
  ifstream envStream(filenameText);
  
  // some error had occured
  if (envStream.fail()) {
    cerr << "Error: Can't open file " << filenameText << " for reading (err. "
         << envStream.rdstate() << ").\n";
    return;
  }
  char buff[256];
  envStream.getline(buff, 255);
  buff[8] = 0;
  if (strcmp(buff, "CGX_CF10") == 0)
    return;

  ofstream cStream(filenameCoded);
  cStream<<"CGX_CF10";
  
  // main loop
  for (;;) {
    // read in one line
    envStream.getline(buff, 255);
    if (!envStream)
      break;
    CodeString(buff, 255);
    cStream<<buff;
  }
  
}

bool
Environment::ReadEnvFile(const char *envFilename)
{
  char buff[MaxStringLength], name[MaxStringLength];
  char *s, *t;
  int i, line = 0;
  bool found;
  igzstream envStream(envFilename);

  // some error had occured
  if (envStream.fail()) {
    cerr << "Error: Can't open file " << envFilename << " for reading (err. "
         << envStream.rdstate() << ").\n";
    return false;
  }
  
  name[0] = '\0';

//    bool coded;
//    envStream.getline(buff, 255);
//    buff[8] = 0;
//    if (strcmp(buff, "CGX_CF10") == 0) 
//      coded = true;
//    else {
//      coded = false;
//      envStream.Rewind();
//    }
  
  // main loop
  for (;;) {
    // read in one line
    envStream.getline(buff, 255);
    
    if (!envStream)
      break;

//      if (coded)
//        DecodeString(buff, 255);

    line++;
    // get rid of comments
    s = strchr(buff, '#');
    if (s != NULL)
      *s = '\0';

    // get one identifier
    s = ParseString(buff, name);
    // parse line
    while (s != NULL) {
      // it's a group name - make the full name
      if (*s == '{') {
        strcat(name, ".");
        s++;
        s = ParseString(s, name);
        continue;
      }
      // end of group
      if (*s == '}') {
        if (strlen(name) == 0) {
          cerr << "Error: unpaired } in " << envFilename << " (line "
               << line << ").\n";
          envStream.close();
          return false;
        }
        name[strlen(name) - 1] = '\0';
        t = strrchr(name, '.');
        if (t == NULL)
          name[0] = '\0';
        else
          *(t + 1) = '\0';
        s++;
        s = ParseString(s, name);
        continue;
      }
      // find variable name in the table
      found = false;
      for (i = 0; i < numOptions; i++)
        if (!strcmp(name, options[i].name)) {
          found = true;
          break;
        }
      if (!found) {
        cerr << "Warning: unknown option " << name << " in environment file "
             << envFilename << " (line " << line << ").\n";
      } else
	switch (options[i].type) {
        case optInt: {
          strtol(s, &t, 10);
          if (t == s || (*t != ' ' && *t != '\t' &&
                         *t != '\0' && *t != '}')) {
            cerr << "Error: Mismatch in int variable " << name << " in "
                 << "environment file " << envFilename << " (line "
                 << line << ").\n";
            envStream.close();
            return false;
          }
          if (options[i].value != NULL)
            delete options[i].value;
          options[i].value = new char[t - s + 1];
          strncpy(options[i].value, s, t - s);
          options[i].value[t - s] = '\0';
          s = t;
          break;
        }
        case optFloat: {
          strtod(s, &t);
          if (t == s || (*t != ' ' && *t != '\t' &&
                         *t != '\0' && *t != '}')) {
            cerr << "Error: Mismatch in Real variable " << name << " in "
                 << "environment file " << envFilename << " (line "
                 << line << ").\n";
            envStream.close();
            return false;
          }
          if (options[i].value != NULL)
            delete options[i].value;
          options[i].value = new char[t - s + 1];
          strncpy(options[i].value, s, t - s);
          options[i].value[t - s] = '\0';
          s = t;
          break;
        }
        case optBool: {
          t = s;
          while ((*t >= 'a' && *t <= 'z') ||
                 (*t >= 'A' && *t <= 'Z') ||
                 *t == '+' || *t == '-')
            t++;
          if (((!strncasecmp(s, "true", t - s)  && t - s == 4) ||
               (!strncasecmp(s, "false", t - s) && t - s == 5) ||
               (!strncasecmp(s, "YES", t -s)    && t - s == 3) ||
               (!strncasecmp(s, "NO", t - s)    && t - s == 2) ||
               (!strncasecmp(s, "ON", t - s)    && t - s == 2) ||
               (!strncasecmp(s, "OFF", t - s)   && t - s == 3) ||
               (t - s == 1 && (*s == '+' || *s == '-'))) &&
              (*t == ' ' || *t == '\t' || *t == '\0' || *t == '}')) {
            if (options[i].value != NULL)
              delete options[i].value;
            options[i].value = new char[t - s + 1];
            strncpy(options[i].value, s, t - s);
            options[i].value[t - s] = '\0';
            s = t;
          }
          else {
            cerr << "Error: Mismatch in bool variable " << name << " in "
                 << "environment file " << envFilename << " (line "
                 << line << ").\n";
            envStream.close();
            return false;
          }
          break;
        }
        case optVector:{
          strtod(s, &t);
          if (*t == ' ' || *t == '\t') {
            while (*t == ' ' || *t == '\t')
              t++;
            if (*t != ',')
              t--;
          }
          if (t == s || (*t != ' ' && *t != '\t' && *t != ',')) {
            cerr << "Error: Mismatch in vector variable " << name << " in "
                 << "environment file " << envFilename << " (line "
                 << line << ").\n";
            envStream.close();
            return false;
          }
          char *u;
          strtod(t, &u);
          t = u;
          if (*t == ' ' || *t == '\t') {
            while (*t == ' ' || *t == '\t')
              t++;
            if (*t != ',')
              t--;
          }
          if (t == s || (*t != ' ' && *t != '\t' && *t != ',')) {
            cerr << "Error: Mismatch in vector variable " << name << " in "
                 << "environment file " << envFilename << " (line "
                 << line << ").\n";
            envStream.close();
            return false;
          }
          strtod(t, &u);
          t = u;
          if (t == s || (*t != ' ' && *t != '\t' &&
                         *t != '\0' && *t != '}')) {
            cerr << "Error: Mismatch in vector variable " << name << " in "
                 << "environment file " << envFilename << " (line "
                 << line << ").\n";
            envStream.close();
            return false;
          }
          if (options[i].value != NULL)
            delete options[i].value;
          options[i].value = new char[t - s + 1];
          strncpy(options[i].value, s, t - s);
          options[i].value[t - s] = '\0';
          s = t;
          break;
        }
        case optString: {
          if (options[i].value != NULL)
            delete options[i].value;
          options[i].value = new char[strlen(s) + 1];
          strcpy(options[i].value, s);
          s += strlen(s);
          break;
        }
        default: {
          Debug << "Internal error: Unknown type of option.\n" << flush;
          exit(1);
        }
      }
      // prepare the variable name for next pass
      t = strrchr(name, '.');
      if (t == NULL)
        name[0] = '\0';
      else
        *(t + 1) = '\0';
      // get next identifier
      s = ParseString(s, name);
    }
  }
  envStream.close();
  return true;
}

void
Environment::PrintUsage(ostream &s) const
{
  // Print out all environment variable names
  s << "Registered options:\n";
  for (int j = 0; j < numOptions; j++)
    s << options[j] << "\n";
  s << flush;
}


Environment::Environment()
{
  optionalParams = NULL;
  paramRows = 0;
  numParams = 0;
  params = NULL;
  maxOptions = 500;

  
// this is maximal nuber of options.
  numOptions = 0;

  options = new COption[maxOptions];

  if (options == NULL ) {
    Debug << "Error: Memory allocation failed.\n";
    exit(1);
  }
  
  // register all basic options

  RegisterOption("Limits.threshold", optFloat, NULL, "0.01");
  RegisterOption("Limits.small", optFloat, NULL, "1e-6");
  RegisterOption("Limits.infinity", optFloat, NULL, "1e6");


  RegisterOption("Scene.filename",
				 optString,
				 "scene_filename=",
				 "atlanta2.x3d");

  RegisterOption("Unigraphics.meshGrouping",
				 optInt,
				 "unigraphics_mesh_grouping=",
				 "0");
  

  RegisterOption("KdTree.Termination.minCost",
				 optInt,
				 "kd_term_min_cost=",
				 "10");
  
  RegisterOption("KdTree.Termination.maxDepth",
				 optInt,
				 "kd_term_max_depth=",
				 "20");

  RegisterOption("KdTree.Termination.maxCostRatio",
				 optFloat,
				 "kd_term_max_cost_ratio=",
				 "1.5");

  RegisterOption("KdTree.Termination.ct_div_ci",
				 optFloat,
				 "kd_term_ct_div_ci=",
				 "1.0");

  RegisterOption("KdTree.splitMethod",
				 optString,
				 "kd_split_method=",
				 "spatialMedian");

  RegisterOption("KdTree.splitBorder",
		 optFloat,
		 "kd_split_border=",
		 "0.1");

  RegisterOption("KdTree.sahUseFaces",
		 optBool,
		 "kd_sah_use_faces=",
		 "true");


  RegisterOption("MeshKdTree.Termination.minCost",
		 optInt,
		 "kd_term_min_cost=",
		 "10");
  
  RegisterOption("MeshKdTree.Termination.maxDepth",
		 optInt,
		 "kd_term_max_depth=",
		 "20");

  RegisterOption("MeshKdTree.Termination.maxCostRatio",
		 optFloat,
		 "kd_term_max_cost_ratio=",
		 "1.5");

  RegisterOption("MeshKdTree.Termination.ct_div_ci",
		 optFloat,
		 "kd_term_ct_div_ci=",
		 "1.0");

  RegisterOption("MeshKdTree.splitMethod",
		 optString,
		 "kd_split_method=",
		 "spatialMedian");

  RegisterOption("MeshKdTree.splitBorder",
		 optFloat,
		 "kd_split_border=",
		 "0.1");

  RegisterOption("SamplingPreprocessor.totalSamples",
		 optInt,
		 "total_samples=",
		 "1000000");

  RegisterOption("SamplingPreprocessor.samplesPerPass",
		 optInt,
		 "samples_per_pass=",
		 "10");

  RegisterOption("VssPreprocessor.initialSamples",
				 optInt,
				 "initial_samples=",
				 "100000");
  
  RegisterOption("VssPreprocessor.testBeamSampling", optBool, "beam_sampling", "false");

  RegisterOption("VssPreprocessor.vssSamples",
				 optInt,
				 "vss_samples=",
				 "1000000");
	
  RegisterOption("VssPreprocessor.vssSamplesPerPass",
				 optInt,
				 "vss_samples_per_pass=",
				 "1000");
  
  RegisterOption("VssPreprocessor.samplesPerPass",
				 optInt,
				 "samples_per_pass=",
				 "100000");



  RegisterOption("VssPreprocessor.useImportanceSampling",
				 optBool,
				 "vss_use_importance=",
				 "true");

   RegisterOption("VssPreprocessor.loadInitialSamples",
	  optBool,
	  "-vss_load_loadInitialSamples=",
	  "false");

   RegisterOption("VssPreprocessor.storeInitialSamples",
	  optBool,
	  "-vss_store_storedInitialSamples=",
	  "false");
   

    RegisterOption("VssPreprocessor.useViewSpaceBox",
	  optBool,
	  "-vss_use_viewspace_box=",
	  "false");
   

  /************************************************************************************/
  /*                         View cells related options                               */
  /************************************************************************************/


	RegisterOption("ViewCells.type",
			optString,
			"view_cells_type",
			"bspTree");

	RegisterOption("ViewCells.active",
					optInt,
					"1000");

	RegisterOption("ViewCells.Construction.samples",
					optInt,
					"view_cells_construction_samples=",
					"5000000");

	RegisterOption("ViewCells.Construction.samplesPerPass",
					optInt,
					"view_cells_construction_samples_per_pass=",
					"500000");

	RegisterOption("ViewCells.PostProcess.samples",
					optInt,
					"view_cells_postprocess_samples=",
					"200000");

	RegisterOption("ViewCells.Visualization.samples",
					optInt,
					"view_cells_visualization_samples=",
					"20000");

	RegisterOption("ViewCells.loadFromFile",
					optBool,
					"view_cells_load_from_file",
					"false");

	RegisterOption("ViewCells.PostProcess.refine",
					optBool,
					"view_cells_refine",
					"false");


	RegisterOption("ViewCells.PostProcess.compress",
					optBool,
					"view_cells_compress",
					"false");

	RegisterOption("ViewCells.exportToFile",
					optBool,
					"view_cells_export_to_file",
					"false");

	RegisterOption("ViewCells.maxViewCells",
			optInt,
			"view_cells_max_view_cells=",
			"0");

	RegisterOption("ViewCells.maxPvsRatio",
					optFloat,
					"view_cells_max_pvs_ratio=",
					"0.1");

	RegisterOption("ViewCells.filename",
			optString,
			"view_cells_filename=",
			"atlanta_viewcells_large.x3d");

	RegisterOption("ViewCells.height",
			optFloat,
			"view_cells_height=",
			"5.0");

	RegisterOption("ViewCells.Visualization.colorCode",
		optString,
		"-view_cells_visualization_color_code",
		"PVS");

	RegisterOption("ViewCells.Visualization.exportRays",
		optBool,
		"-view_cells_delayed_construction",
		"false");

	

	RegisterOption("ViewCells.Visualization.exportGeometry",
		optBool,
		"-view_cells_visualization_export_geometry",
		"false");

	RegisterOption("ViewCells.pruneEmptyViewCells",
		optBool,
		"-view_cells_prune_empty_view_cells",
		"false");

	RegisterOption("ViewCells.processOnlyValidViewCells",
		optBool,
		"-view_cells_process_only_valid_view_cells",
		"false");
	
	
	RegisterOption("ViewCells.PostProcess.maxCostRatio",
			optFloat,
			"-view_cells_post_process_max_cost_ratio=",
			"0.9");

	
	RegisterOption("ViewCells.PostProcess.renderCostWeight",
			optFloat,
			"-view_cells_post_process_render_cost_weight",
			"0.5");

	
	RegisterOption("ViewCells.PostProcess.avgCostMaxDeviation",
			optFloat,
			"-vsp_bsp_avgcost_max_deviations",
			"0.5");

	RegisterOption("ViewCells.PostProcess.maxMergesPerPass", 
		optInt, 
		"vsp_bsp_term_max_merges_per_pass=", 
		"500");

	RegisterOption("ViewCells.PostProcess.minViewCells", 
		optInt, 
		"vsp_bsp_term_post_process_min_view_cells=", 
		"1000");

	RegisterOption("ViewCells.PostProcess.useRaysForMerge", 
		optBool,
		"view_cells_post_process_use_rays_for_merge=", 
		"false");
	
	RegisterOption("ViewCells.PostProcess.merge", 
		optBool,
		"view_cells_post_merge=", 
		"true");

	RegisterOption("ViewCells.Visualization.exportMergedViewCells",
		optBool, 
		"view_cells_viz_export_merged_viewcells=", 
		"false");

	RegisterOption("ViewCells.maxStaticMemory", 
		optFloat, 
		"view_cells_max_static_mem=", 
		"8.0");

	RegisterOption("ViewCells.Visualization.useCuttingPlane",
		optBool, 
		"view_cells_viz_use_cutting_plane=", 
		"false");

	
	RegisterOption("ViewCells.Visualization.cuttingPlaneAxis",
		optInt, 
		"view_cells_viz_cutting_plane_axis=", 
		"0");


	/************************************************************************************/
	/*                         Render simulation related options                        */
	/************************************************************************************/


	RegisterOption("Simulation.objRenderCost",
			optFloat,
			"simulation_obj_render_cost",
			"1.0");

	RegisterOption("Simulation.vcOverhead",
			optFloat,
			"simulation_vc_overhead",
			"0.05");

	RegisterOption("Simulation.moveSpeed",
			optFloat,
			"simulation_moveSpeed",
			"1.0");




	/************************************************************************************/
	/*                         Bsp tree related options                                 */
	/************************************************************************************/


	RegisterOption("BspTree.Construction.input",
		optString,
		"bsp_construction_input=",
		"fromViewCells");

	RegisterOption("BspTree.Construction.samples",
		optInt,
		"bsp_construction_samples=",
		"100000");

	RegisterOption("BspTree.Construction.epsilon",
		optFloat,
		"bsp_construction_side_tolerance=",
		"0.002");

	RegisterOption("BspTree.Termination.minPolygons",
			optInt,
			"bsp_term_min_polygons=",
			"5");

	RegisterOption("BspTree.Termination.minPvs",
			optInt,
			"bsp_term_min_pvs=",
			"20");

	RegisterOption("BspTree.Termination.minProbability",
			optFloat,
			"bsp_term_min_probability=",
			"0.001");

	RegisterOption("BspTree.Termination.maxRayContribution",
			optFloat,
			"bsp_term_ray_contribution=",
			"0.005");

	RegisterOption("BspTree.Termination.minAccRayLenght",
			optFloat,
			"bsp_term_min_acc_ray_length=",
			"50");

	RegisterOption("BspTree.Termination.minRays",
			optInt,
			"bsp_term_min_rays=",
			"-1");

	RegisterOption("BspTree.Termination.ct_div_ci",
			optFloat,
			"bsp_term_ct_div_ci=",
			"0.0");

	RegisterOption("BspTree.Termination.maxDepth",
			optInt,
			"bsp_term_max_depth=",
			"100");

	RegisterOption("BspTree.Termination.maxCostRatio",
			optFloat,
			"bsp_term_axis_aligned_max_cost_ratio=",
			"1.5");

	RegisterOption("BspTree.Termination.AxisAligned.ct_div_ci",
			optFloat,
			"bsp_term_axis_aligned_ct_div_ci=",
			"0.5");

	RegisterOption("BspTree.AxisAligned.splitBorder",
			optFloat,
			"bsp__axis_aligned_split_border=",
			"0.1");

	RegisterOption("BspTree.Termination.AxisAligned.minPolys",
			optInt,
			"bsp_term_axis_aligned_max_polygons=",
			"50");

	RegisterOption("BspTree.Termination.AxisAligned.minObjects",
			optInt,
			"bsp_term_min_objects=",
			"3");

	RegisterOption("BspTree.Termination.AxisAligned.minRays",
			optInt,
			"bsp_term_axis_aligned_min_rays=",
			"-1");

	RegisterOption("BspTree.splitPlaneStrategy",
			optString,
			"bsp_split_method=",
			"leastSplits");

	RegisterOption("BspTree.maxPolyCandidates",
		optInt,
		"bsp_max_poly_candidates=",
		"20");

	RegisterOption("BspTree.maxRayCandidates",
		optInt,
		"bsp_max_plane_candidates=",
		"20");

	RegisterOption("BspTree.maxTests",
		optInt,
		"bsp_max_tests=",
		"5000");

	RegisterOption("BspTree.Termination.maxViewCells",
		optInt,
		"bsp_max_view_cells=",
		"5000");

	RegisterOption("BspTree.Visualization.exportSplits",
		optBool,
		"bsp_visualization.export_splits",
		"false");

	RegisterOption("BspTree.Factor.verticalSplits", optFloat, "bsp_factor_vertical=", "1.0");
	RegisterOption("BspTree.Factor.largestPolyArea", optFloat, "bsp_factor_largest_poly=", "1.0");
	RegisterOption("BspTree.Factor.blockedRays", optFloat, "bsp_factor_blocked=", "1.0");
	RegisterOption("BspTree.Factor.leastSplits", optFloat, "bsp_factor_least_splits=", "1.0");
	RegisterOption("BspTree.Factor.balancedPolys", optFloat, "bsp_factor_balanced_polys=", "1.0");
	RegisterOption("BspTree.Factor.balancedViewCells", optFloat, "bsp_factor_balanced_view_cells=", "1.0");
	RegisterOption("BspTree.Factor.leastRaySplits", optFloat, "bsp_factor_least_ray_splits=", "1.0");
	RegisterOption("BspTree.Factor.balancedRays", optFloat, "bsp_factor_balanced_rays=", "1.0");
	RegisterOption("BspTree.Factor.pvs", optFloat, "bsp_factor_pvs=", "1.0");

	/************************************************************************************/
	/*                         Preprocessor related options                             */
	/************************************************************************************/

	RegisterOption("Preprocessor.type",
					optString,
					"preprocessor=",
					"sampling");

	RegisterOption("Preprocessor.samplesFilename",
					optString,
					"-preprocessor_samples_filename=",
					"rays.out");

	RegisterOption("Preprocessor.useGlRenderer",
					optBool,
					"useGlRenderer",
					"false");

	RegisterOption("Preprocessor.pvsRenderErrorSamples",
				   optInt,
				   "pvsRenderErrorSamples=",
				   "10000");

	RegisterOption("Preprocessor.useGlDebugger",
					optBool,
					"useGlDebugger",
					"false");

	RegisterOption("Preprocessor.detectEmptyViewSpace",
				   optBool,
				   "detectEmptyViewSpace",
				   "false");
	

	/**************************************************************************************/
	/*                  View space partition KD tree related options                      */
	/**************************************************************************************/

	RegisterOption("VspKdTree.Construction.samples",
					optInt,
					"vsp_kd_construction_samples=",
					"100000");

	RegisterOption("VspKdTree.Termination.maxDepth", 
		optInt, 
		"vsp_term_maxdepth=", "30");

	RegisterOption("VspKdTree.Termination.minPvs", 
		optInt, 
		"vsp_minpvs=", 
		"1");

	RegisterOption("VspKdTree.Termination.minRays", 
		optInt, 
		"vsp_term_minrays=", 
		"10");

	RegisterOption("VspKdTree.Termination.minSize", 
		optFloat, 
		"vsp_term_minsize=", 
		"0.001");

	RegisterOption("VspKdTree.Termination.maxCostRatio", 
		optFloat, 
		"vsp_term_maxcost=",
		"0.95");

	RegisterOption("VspKdTree.Termination.maxRayContribution", 
		optFloat, 
		"vsp_term_max_ray_contrib=", 
		"0.5");

	RegisterOption("VspKdTree.epsilon", 
		optFloat, 
		"kd_eps=", 
		"1e-6");

	RegisterOption("VspKdTree.ct_div_ci", 
		optFloat, 
		"vsp_ctdivci=", "1.0");

	RegisterOption("VspKdTree.splitType", 
		optString, 
		"split=", 
		"queries");

	RegisterOption("VspKdTree.splitAxis", 
		optString, 
		"split=", 
		"drivingAxis");

	RegisterOption("VspKdTree.splitUseOnlyDrivingAxis", 
		optBool, 
		"vsp_kd_splitdriving=", 
		"false");

	RegisterOption("VspKdTree.numberOfEndPointDomains", 
		optInt, 
		"endpoints=", 
		"10000");

	RegisterOption("VspKdTree.maxTotalMemory", 
		optFloat, 
		"vsp_max_total_mem=", 
		"60.0");

	RegisterOption("VspKdTree.maxStaticMemory", 
		optFloat, 
		"vsp_max_static_mem=", 
		"8.0");

	RegisterOption("VspKdTree.queryType", 
		optString, 
		"qtype=", 
		"static");

	RegisterOption("VspKdTree.queryPosWeight", 
		optFloat, 
		"vsp_kd_qposweight=", 
		"0.0");

	RegisterOption("VspKdTree.accessTimeThreshold", 
		optInt, 
		"vsp_kd_accesstime=", 
		"1000");

	RegisterOption("VspKdTree.minCollapseDepth", 
		optInt, 
		"vsp_kd_min_colldepth=", 
		"4");

	RegisterOption("VspKdTree.PostProcess.maxCostRatio",
			optFloat,
			"vsp_kd_post_process_max_cost_ratio=",
			"0.9");

	RegisterOption("VspKdTree.PostProcess.minViewCells", 
		optInt, 
		"vsp_kd_term_post_process_min_view_cells=", 
		"1000");

	RegisterOption("VspKdTree.Termination.maxViewCells", 
		optInt, 
		"vsp_kd_term_post_process_min_view_cells=", 
		"300");

	RegisterOption("VspKdTree.PostProcess.maxPvsSize", 
		optInt, 
		"vsp_kd_term_post_process_max_pvs_size=", 
		"100");

	RegisterOption("VspKdTree.Termination.missTolerance",
			optInt,
			"-vsp_kd_term_miss_tolerance=",
			"4");

	/************************************************************************************/
	/*                   VSS Preprocessor cells related options                         */
	/************************************************************************************/

	RegisterOption("VssTree.maxDepth", optInt, "kd_depth=", "12");
	RegisterOption("VssTree.minPvs", optInt, "kd_minpvs=", "1");
	RegisterOption("VssTree.minRays", optInt, "kd_minrays=", "10");
	RegisterOption("VssTree.maxCostRatio", optFloat, "maxcost=", "0.95");
	RegisterOption("VssTree.maxRayContribution", optFloat, "maxraycontrib=", "0.5");

	RegisterOption("VssTree.epsilon", optFloat, "kd_eps=", "1e-6");
	RegisterOption("VssTree.ct_div_ci", optFloat, "kd_ctdivci=", "1.0");
	RegisterOption("VssTree.randomize", optBool, "randomize", "false");
	RegisterOption("VssTree.splitType", optString, "split=", "queries");
	RegisterOption("VssTree.splitUseOnlyDrivingAxis", optBool, "splitdriving=", "false");
	RegisterOption("VssTree.useRss", optBool, "rss=", "false");
	RegisterOption("VssTree.numberOfEndPointDomains", optInt, "endpoints=", "10000");

	RegisterOption("VssTree.minSize", optFloat, "minsize=", "0.001");

	RegisterOption("VssTree.maxTotalMemory", optFloat, "mem=", "60.0");
	RegisterOption("VssTree.maxStaticMemory", optFloat, "statmem=", "8.0");

	RegisterOption("VssTree.queryType", optString, "qtype=", "static");

	
	
	RegisterOption("VssTree.queryPosWeight", optFloat, "qposweight=", "0.0");
	RegisterOption("VssTree.useRefDirSplits", optBool, "refdir", "false");
	RegisterOption("VssTree.refDirAngle", optFloat, "refangle=", "10");
	RegisterOption("VssTree.refDirBoxMaxSize", optFloat, "refboxsize=", "0.1");
	RegisterOption("VssTree.accessTimeThreshold", optInt, "accesstime=", "1000");
	RegisterOption("VssTree.minCollapseDepth", optInt, "colldepth=", "4");

	RegisterOption("VssTree.interleaveDirSplits", optBool, "interleavedirsplits", "true");
	RegisterOption("VssTree.dirSplitDepth", optInt, "dirsplidepth=", "10");


	RegisterOption("RssPreprocessor.initialSamples",
									optInt,
									"initial_samples=",
									"100000");

	RegisterOption("RssPreprocessor.vssSamples",
					optInt,
					"rss_vss_samples=",
					"1000000");

	RegisterOption("RssPreprocessor.vssSamplesPerPass",
					optInt,
					"rss_vss_samples_per_pass=",
					"1000");

	RegisterOption("RssPreprocessor.samplesPerPass",
					optInt,
					"rss_samples_per_pass=",
					"100000");

	RegisterOption("RssPreprocessor.useImportanceSampling",
					optBool,
					"rss_use_importance",
					"true");

	RegisterOption("RssPreprocessor.objectBasedSampling",
					optBool,
					"rss_object_based_sampling",
					"true");

	RegisterOption("RssPreprocessor.directionalSampling",
					optBool,
					"rss_directional_sampling",
					"false");

	RegisterOption("RssTree.maxDepth", optInt, "kd_depth=", "12");
	RegisterOption("RssTree.minPvs", optInt, "kd_minpvs=", "1");
	RegisterOption("RssTree.minRays", optInt, "kd_minrays=", "10");
	RegisterOption("RssTree.maxCostRatio", optFloat, "maxcost=", "0.95");
	RegisterOption("RssTree.maxRayContribution", optFloat, "maxraycontrib=", "0.5");

	RegisterOption("RssTree.epsilon", optFloat, "kd_eps=", "1e-6");
	RegisterOption("RssTree.ct_div_ci", optFloat, "kd_ctdivci=", "1.0");
	RegisterOption("RssTree.randomize", optBool, "randomize", "false");
	RegisterOption("RssTree.splitType", optString, "split=", "queries");
	RegisterOption("RssTree.splitUseOnlyDrivingAxis", optBool, "splitdriving=", "false");

	RegisterOption("RssTree.numberOfEndPointDomains", optInt, "endpoints=", "10000");

	RegisterOption("RssTree.minSize", optFloat, "minsize=", "0.001");

	RegisterOption("RssTree.maxTotalMemory", optFloat, "mem=", "60.0");
	RegisterOption("RssTree.maxStaticMemory", optFloat, "statmem=", "8.0");

	RegisterOption("RssTree.queryType", optString, "qtype=", "static");

	RegisterOption("RssTree.queryPosWeight", optFloat, "qposweight=", "0.0");
	RegisterOption("RssTree.useRefDirSplits", optBool, "refdir", "false");
	RegisterOption("RssTree.refDirAngle", optFloat, "refangle=", "10");
	RegisterOption("RssTree.refDirBoxMaxSize", optFloat, "refboxsize=", "0.1");
	RegisterOption("RssTree.accessTimeThreshold", optInt, "accesstime=", "1000");
	RegisterOption("RssTree.minCollapseDepth", optInt, "colldepth=", "4");

	RegisterOption("RssTree.interleaveDirSplits", optBool, "interleavedirsplits", "true");
	RegisterOption("RssTree.dirSplitDepth", optInt, "dirsplidepth=", "10");
	RegisterOption("RssTree.importanceBasedCost", optBool, "importance_based_cost", "true");
	RegisterOption("RssTree.maxRays", optInt, "rss_max_rays=", "2000000");

	RegisterOption("RssTree.perObjectTree", optBool, "rss_per_object_tree", "false");

	RegisterOption("RssPreprocessor.Export.pvs", optBool, "rss_export_pvs", "false");
	RegisterOption("RssPreprocessor.Export.rssTree", optBool, "rss_export_rss_tree", "false");
	RegisterOption("RssPreprocessor.Export.rays", optBool, "rss_export_rays", "false");
	RegisterOption("RssPreprocessor.Export.numRays", optInt, "rss_export_num_rays=", "5000");
	RegisterOption("RssPreprocessor.useViewcells", optBool, "rss_use_viewcells", "false");
	RegisterOption("RssPreprocessor.updateSubdivision",
				   optBool,
				   "rss_update_subdivision",
				   "false");


/************************************************************************************/
/*               View space partition BSP tree related options                      */
/************************************************************************************/


	RegisterOption("RssPreprocessor.loadInitialSamples",
					optBool,
					"vss_load_loadInitialSamples=",
					"false");

	RegisterOption("RssPreprocessor.storeInitialSamples",
					optBool,
					"vss_store_storeInitialSamples=",
					"false");


/************************************************************************************/
/*               View space partition BSP tree related options                      */
/************************************************************************************/


	RegisterOption("VspBspTree.Termination.minPolygons",
					optInt,
					"vsp_bsp_term_min_polygons=",
					"5");

	RegisterOption("VspBspTree.Termination.minPvs",
					optInt,
					"vsp_bsp_term_min_pvs=",
					"20");
	RegisterOption("VspBspTree.Termination.minProbability",
					optFloat,
					"vsp_bsp_term_min_probability=",
					"0.001");

	RegisterOption("VspBspTree.Termination.maxRayContribution",
					optFloat,
					"vsp_bsp_term_ray_contribution=",
					"0.005");

	RegisterOption("VspBspTree.Termination.minAccRayLenght",
					optFloat,
					"vsp_bsp_term_min_acc_ray_length=",
					"50");

	RegisterOption("VspBspTree.Termination.minRays",
					optInt,
					"vsp_bsp_term_min_rays=",
					"-1");

	RegisterOption("VspBspTree.Termination.ct_div_ci",
					optFloat,
					"vsp_bsp_term_ct_div_ci=",
					"0.0");

	RegisterOption("VspBspTree.Termination.maxDepth",
					optInt,
					"vsp_bsp_term_max_depth=",
					"100");

	RegisterOption("VspBspTree.Termination.AxisAligned.maxCostRatio",
		optFloat,
		"-vsp_bsp_term_axis_aligned_max_cost_ratio=",
		"1.5");

	RegisterOption("VspBspTree.Termination.maxViewCells",
		optInt,
		"-vsp_bsp_term_max_view_cells=",
		"1000");

	RegisterOption("VspBspTree.Termination.maxCostRatio",
		optFloat,
		"-vsp_bsp_term_max_cost_ratio=",
		"1.5");

	RegisterOption("VspBspTree.Termination.missTolerance",
					optInt,
					"vsp_bsp_term_miss_tolerance=",
					"4");
	RegisterOption("VspBspTree.splitPlaneStrategy",
					optString,
					"vsp_bsp_split_method=",
					"leastSplits");

	RegisterOption("VspBspTree.maxPolyCandidates",
					optInt,
					"vsp_bsp_max_poly_candidates=",
					"20");
	RegisterOption("VspBspTree.maxRayCandidates",
					optInt,
					"vsp_bsp_max_plane_candidates=",
					"20");

	RegisterOption("VspBspTree.maxTests",
					optInt,
					"vsp_bsp_max_tests=",
					"5000");

	RegisterOption("VspBspTree.Construction.samples",
					optInt,
					"bsp_construction_samples=",
					"100000");

	RegisterOption("VspBspTree.Construction.epsilon",
					optFloat,
					"vsp_bsp_construction_side_tolerance=",
					"0.002");

	RegisterOption("VspBspTree.Visualization.exportSplits",
					optBool,
					"vsp_bsp_visualization.export_splits",
					"false");

	RegisterOption("VspBspTree.splitUseOnlyDrivingAxis", 
					optBool, 
					"vsp_bsp_splitdriving=", 
					"false");

	RegisterOption("VspBspTree.Termination.AxisAligned.minRays",
			optInt,
			"bsp_term_axis_aligned_min_rays=",
			"100");
	
	RegisterOption("VspBspTree.Termination.AxisAligned.maxRayContribution",
			optFloat,
			"bsp_term_axis_aligned_min_rays=",
			"0.1");

	RegisterOption("VspBspTree.Factor.leastRaySplits", optFloat, "-vsp_bsp_factor_least_ray_splits=", "1.0");
	RegisterOption("VspBspTree.Factor.balancedRays", optFloat, "-vsp_bsp_factor_balanced_rays=", "1.0");
	RegisterOption("VspBspTree.Factor.pvs", optFloat, "-vsp_bsp_factor_pvs=", "1.0");


	RegisterOption("VspBspTree.Construction.renderCostWeight",
			optFloat,
			"-vsp_bsp_post_process_render_cost_weight",
			"0.5");


	RegisterOption("VspBspTree.Construction.randomize", 
		optBool, 
		"vsp_bsp_construction_randomize=", 
		"false");

	
	RegisterOption("VspBspTree.maxTotalMemory", 
		optFloat, 
		"vsp_bsp_max_total_mem=", 
		"60.0");

	RegisterOption("VspBspTree.maxStaticMemory", 
		optFloat, 
		"vsp_bsp_max_static_mem=", 
		"8.0");

	
	

	//////////////////////////////////////////////////////////////////////////////////
}

void
Environment::SetStaticOptions()
{
  
  // get Global option values
  GetRealValue("Limits.threshold", Limits::Threshold);
  GetRealValue("Limits.small", Limits::Small);
  GetRealValue("Limits.infinity", Limits::Infinity);


}

void
Environment::Parse(const int argc, char **argv, bool useExePath)
{
  
  // Read the names of the scene, environment and output files
  ReadCmdlineParams(argc, argv, "");

  char *envFilename = new char[128];

  char filename[64];

  // Get the environment file name
  if (!GetParam(' ', 0, filename)) {
    // user didn't specified environment file explicitly, so
    strcpy(filename, "default.env");
  }
  
  if (useExePath) {
    char *path = GetPath(argv[0]);
    if (*path != 0)
      sprintf(envFilename, "%s/%s", path, filename);
    else
      strcpy(envFilename, filename);
    
    delete path;
  }
  else
    strcpy(envFilename, filename);

  
  // Now it's time to read in environment file.
  if (!ReadEnvFile(envFilename)) {
    // error - bad input file name specified ?
    cerr<<"Error parsing environment file "<<envFilename<<endl;
  }
  delete envFilename;

  // Parse the command line; options given on the command line subsume
  // stuff specified in the input environment file.
  ParseCmdline(argc, argv, 0);

  SetStaticOptions();

  // Check for request for help
  if (CheckForSwitch(argc, argv, '?')) {
    PrintUsage(cout);
    exit(0);
  }

}