source: trunk/VUT/Ogre/src/OgreTerrainContentGenerator.cpp @ 111

#include "OgreTerrainContentGenerator.h"

#define MAX_HEIGHT 5000 // maximal possible height

namespace Ogre {

/*************************************************/
/*         RayQueryExecutor implementation       */
/*************************************************/

//-----------------------------------------------------------------------
RayQueryExecutor::RayQueryExecutor(SceneManager *sm)
{
        mRaySceneQuery = sm->createRayQuery(Ray());
}
//-----------------------------------------------------------------------
RayQueryExecutor::~RayQueryExecutor()
{
        delete mRaySceneQuery;
}
//-----------------------------------------------------------------------
bool RayQueryExecutor::executeRayQuery(Vector3 *result, const Vector3 &pos, 
                                                                           const Vector3 &dir)
{
        return executeRayQuery(result, Ray(pos, dir));
}
//-----------------------------------------------------------------------
bool RayQueryExecutor::executeRayQuery(Vector3 *result, const Ray &ray)
{
    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;
}

/*******************************************************/
/*     TerrainContentGenerator implementation          */
/*******************************************************/

//-----------------------------------------------------------------------
TerrainContentGenerator::TerrainContentGenerator(SceneManager *sm):
SceneContentGenerator(sm), mOffset(0)
{
        mMinPos = Vector3(0.0f, MAX_HEIGHT, 0.0f);
        mMaxPos = Vector3(3000.0f, MAX_HEIGHT, 3000.0f);

        mMinAngle = Vector3(0.0f, 0.0f, 0.0f);
        mMaxAngle = Vector3(360.0f, 0.0f, 0.0f);

        mRayQueryExecutor = new RayQueryExecutor(sm);
}
//-----------------------------------------------------------------------
TerrainContentGenerator::~TerrainContentGenerator()
{
        delete mRayQueryExecutor;
}
//-----------------------------------------------------------------------
SceneNode *TerrainContentGenerator::GenerateSceneObject(const Vector3 &position, 
                                         const Vector3 &rotation, const String& objName)
{
        Vector3 queryResult;
        // set y to max height so we are sure to be over terrain
        Vector3 pos(position.x, MAX_HEIGHT, position.z);

        if (mRayQueryExecutor->executeRayQuery(&queryResult, position, Vector3::NEGATIVE_UNIT_Y))
        {
                // reject if height is too high
                if (queryResult.y < mMaxPos.y)
                {
                        // add offset so object is over terrain
                        queryResult.y += mOffset;

                        return SceneContentGenerator::GenerateSceneObject(queryResult, rotation, objName);
                }
        }
        
        return NULL;
}
//-----------------------------------------------------------------------
RayQueryExecutor *TerrainContentGenerator::GetRayQueryExecutor()
{
        return mRayQueryExecutor;
}
//-----------------------------------------------------------------------
void TerrainContentGenerator::SetOffset(Real offset)
{
        mOffset = offset;
}

} // namespace Ogre