1 | #ifndef __VSS_RAY_H
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2 | #define __VSS_RAY_H
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3 |
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4 | #include <vector>
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5 | using namespace std;
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6 | #include "Vector3.h"
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7 | #include "Ray.h"
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8 |
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9 | class AxisAlignedBox3;
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10 | class Intersectable;
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11 |
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12 | class VssRay {
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13 | public:
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14 | // various flags
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15 | enum {
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16 | FPosDirX = 1, // the direction of ray in X-axis is positive
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17 | FPosDirY = 2, // the direction of ray in Y-axis is positive
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18 | FPosDirZ = 4 // the direction of ray in Z-axis is positive
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19 | };
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20 |
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21 | static int mailID;
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22 | int mMailbox;
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23 |
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24 | // side of the ray - used for the ray classification
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25 | // char mSide;
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26 |
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27 | // computed t
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28 | float mT;
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29 |
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30 | // inverse of the ray size
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31 | float mInvSize;
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32 |
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33 | // counter of references to this ray
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34 | short mRefCount;
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35 |
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36 | // various flags
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37 | char mFlags;
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38 |
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39 | Vector3 mOrigin;
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40 | Vector3 mTermination;
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41 |
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42 | /// Termination object for the ray
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43 | /// only the termination object is actually used
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44 | Intersectable *mOriginObject;
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45 | Intersectable *mTerminationObject;
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46 |
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47 | //////////////////////////////
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48 | VssRay(const Vector3 &origin,
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49 | const Vector3 &termination,
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50 | Intersectable *originObject,
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51 | Intersectable *terminationObject):
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52 | mMailbox(-1),
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53 | mOrigin(origin),
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54 | mTermination(termination),
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55 | mOriginObject(originObject),
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56 | mTerminationObject(terminationObject),
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57 | mRefCount(0),
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58 | mFlags(0)
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59 | {
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60 | Precompute();
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61 | }
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62 |
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63 | VssRay(const Ray &ray):
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64 | mOrigin(ray.GetLoc()),
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65 | mOriginObject(ray.sourceObject.mObject),
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66 | mRefCount(0),
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67 | mFlags(0),
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68 | mMailbox(-1)
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69 | {
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70 | if (!ray.intersections.empty())
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71 | {
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72 | mTermination = ray.intersections[0].mT;
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73 | mTerminationObject = ray.intersections[0].mObject;
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74 | }
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75 | else
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76 | {
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77 | mTermination = Limits::Infinity;
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78 | mTerminationObject = NULL;
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79 | }
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80 | }
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81 |
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82 | void Precompute() {
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83 | mFlags = 0;
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84 | Vector3 dir = GetDir();
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85 |
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86 | #define BIDIRECTIONAL_RAY 0
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87 | #if BIDIRECTIONAL_RAY
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88 | if (dir.y < 0) {
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89 | // swap objects and poits
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90 | swap(mOriginObject, mTerminationObject);
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91 | swap(mOrigin, mTermination);
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92 | dir = -dir;
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93 | }
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94 | #endif
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95 | if (dir.x > 0.0f) mFlags |= FPosDirX;
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96 | if (dir.y > 0.0f) mFlags |= FPosDirY;
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97 | if (dir.z > 0.0f) mFlags |= FPosDirZ;
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98 |
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99 | mInvSize = 1.0f/Magnitude(GetDir());
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100 | }
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101 |
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102 | void Mail() { mMailbox = mailID; }
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103 | static void NewMail() { mailID++; }
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104 | bool Mailed() const { return mMailbox == mailID; }
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105 |
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106 | bool Mailed(const int mail) {
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107 | return mMailbox >= mailID + mail;
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108 | }
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109 |
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110 | int HitCount() const {
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111 | #if BIDIRECTIONAL_RAY
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112 | if (mOriginObject && mTerminationObject)
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113 | return 2;
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114 | if (mOriginObject || mTerminationObject)
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115 | return 1;
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116 | return 0;
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117 | #else
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118 | return (mTerminationObject) ? 1 : 0;
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119 | #endif
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120 | }
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121 |
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122 | Vector3 GetOrigin() const { return mOrigin; }
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123 | Vector3 GetTermination() const { return mTermination; }
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124 | Vector3 GetDir() const { return mTermination - mOrigin; }
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125 | // Vector3 GetNormalizedDir() const { return Normalize(termination - mOrigin); }
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126 | Vector3 GetNormalizedDir() const { return (mTermination - mOrigin)*mInvSize; }
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127 |
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128 | float GetDirParametrization(const int axis) const;
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129 |
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130 | float GetInvSize() const { return mInvSize; }
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131 | float GetOrigin(const int axis) const { return mOrigin[axis]; }
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132 | float GetTermination(const int axis) const { return mTermination[axis]; }
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133 | float GetDir(const int axis) const { return mTermination[axis] - mOrigin[axis]; }
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134 | float GetNormalizedDir(const int axis) const {
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135 | return (mTermination[axis] - mOrigin[axis])*mInvSize;
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136 | }
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137 |
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138 | bool
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139 | ComputeMinMaxT(const AxisAlignedBox3 &box,
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140 | float &tmin,
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141 | float &tmax) const;
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142 |
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143 | bool
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144 | Intersects(const AxisAlignedBox3 &box,
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145 | float &tmin,
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146 | float &tmax) const;
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147 |
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148 | bool
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149 | IntersectsSphere(const Vector3 ¢er,
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150 | const float sqrRadius,
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151 | Vector3 &point,
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152 | float &t) const;
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153 |
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154 | void
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155 | Translate(const Vector3 &translation) {
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156 | mOrigin += translation;
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157 | mTermination += translation;
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158 | }
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159 |
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160 | bool HasPosDir(const int axis) const { return mFlags & (1<<axis); }
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161 |
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162 | char Flags() const { return mFlags;}
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163 | void SetFlags(char orFlag) { mFlags |= orFlag;}
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164 |
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165 | bool IsActive() const { return mRefCount>0; }
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166 |
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167 | // reference counting for leaf nodes
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168 | int RefCount() const { return mRefCount; }
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169 | int Ref() { return mRefCount++; }
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170 |
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171 | void ScheduleForRemoval() { if (mRefCount>0) mRefCount = -mRefCount; }
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172 | bool ScheduledForRemoval() const { return mRefCount<0; }
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173 | void Unref() {
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174 | if (mRefCount > 0)
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175 | mRefCount--;
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176 | else
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177 | if (mRefCount < 0)
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178 | mRefCount++;
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179 | else {
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180 | cerr<<"Trying to unref already deleted ray!"<<endl;
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181 | exit(1);
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182 | }
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183 | }
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184 | };
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185 |
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186 |
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187 |
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188 | typedef vector<VssRay *> VssRayContainer;
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189 |
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190 |
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191 |
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192 | #endif
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