source: trunk/VUT/OcclusionCullingSceneManager/TestCullingTerrain/TerrainContentGenerator.cpp @ 55

/**
    \file 
        TerrainContentGenerator.cpp
    \brief
        Creates content for the terrain,
*/
#include "TerrainContentGenerator.h"

//-----------------------------------------------------------------------
TerrainContentGenerator::TerrainContentGenerator( SceneManager *sm, RayQueryExecutor *rayQueryEx )
{
        mSceneMgr = sm;
        mRayQueryExecutor = rayQueryEx;

        mMinTranslation = Vector3(-70.0f, -70.0f, 0.0f);
        mMaxTranslation = Vector3(70.0f, 70.0f, 600.0f);

        mMinAngle = 0;
        mMaxAngle = 360;

        mCount = 0;
}
//-----------------------------------------------------------------------
void TerrainContentGenerator::generateScene( int numObjects )
{
        srand (time (0));
        
        Vector3 rotationRatio;
        Vector3 translationRatio;

        for(int i=0; i < numObjects; i++)
        {
                rotationRatio.x = rand() / (float) RAND_MAX;
                rotationRatio.y = rand() / (float) RAND_MAX;
                rotationRatio.z = rand() / (float) RAND_MAX;

                translationRatio.x = rand() / (float) RAND_MAX;
                translationRatio.y = rand() / (float) RAND_MAX;
                translationRatio.z = rand() / (float) RAND_MAX;

                generateSceneObject(translationRatio, rotationRatio, i, "sphere.mesh");
        }
}
//-----------------------------------------------------------------------
void TerrainContentGenerator::generateSceneObject(const Vector3 &translationRatio, 
                                         const Vector3 &rotationRatio, const int idx, const String& entName)
{
        // Setup the ray scene query
        Real rotation = mMinAngle + rotationRatio.x * (mMaxAngle - mMinAngle);
        Vector3 translation = mMinTranslation + translationRatio * (mMaxTranslation - mMinTranslation);

        translation.y = 5000;
    
        Vector3 queryResult;

        if(mRayQueryExecutor->executeRayQuery(&queryResult, translation, Vector3::NEGATIVE_UNIT_Y))
        {
                char name[16];
                sprintf( name, "%s%d", entName.c_str(), mCount++);

                Entity *ent = mSceneMgr->createEntity(name, entName);
                SceneNode *currentObject = mSceneMgr->getRootSceneNode( )->createChildSceneNode( String(name) + "Node", queryResult);
                currentObject->attachObject(ent);
                currentObject->setScale(0.1f, 0.1f, 0.1f);
        }
}
//-----------------------------------------------------------------------
RayQueryExecutor::RayQueryExecutor( SceneManager *sm )
{
        mRaySceneQuery = sm->createRayQuery(Ray());
}
//-----------------------------------------------------------------------
RayQueryExecutor::~RayQueryExecutor()
{
        delete mRaySceneQuery;
}
//-----------------------------------------------------------------------
bool RayQueryExecutor::executeRayQuery( Vector3 *result, const Vector3 &pos, const Vector3 &dir )
{
        Ray ray(pos, dir);
    mRaySceneQuery->setRay(ray);

    // Perform the scene query
    RaySceneQueryResult &queryResult = mRaySceneQuery->execute();
    RaySceneQueryResult::iterator it = queryResult.begin( );

        if (it != queryResult.end() && it->worldFragment)
        {
                SceneQuery::WorldFragment* wf = it->worldFragment;

                *result = wf->singleIntersection; 
                return true;
        }

        return false;
}