/*! Calculates \a matWorldToLight and \a matEyeToLight for a directional light
\a dirL and inverse viewing matrix \a matEyeToWorld.
*/
void ShaderShadowMapEngine::calcDirectionalLightMatrices(
Matrixr &matWorldToLight,
Matrixr &matEyeToLight,
const DirectionalLight *dirL,
const Matrixr &matEyeToWorld)
{
if(dirL->getBeacon() != NULL)
dirL->getBeacon()->getToWorld(matWorldToLight);
Quaternion rotLightDir (Vec3r(0.f, 0.f, 1.f), dirL->getDirection());
Matrixr matLightDir;
matLightDir.setRotate(rotLightDir);
matWorldToLight.mult (matLightDir);
matWorldToLight.invert( );
matEyeToLight = matWorldToLight;
matEyeToLight.mult(matEyeToWorld);
}
/*! Calculates \a matWorldToLight and \a matEyeToLight for a spot light
\a spotL and inverse viewing matrix \a matEyeToWorld.
*/
void ShaderShadowMapEngine::calcSpotLightMatrices(
Matrixr &matWorldToLight,
Matrixr &matEyeToLight,
const SpotLight *spotL,
const Matrixr &matEyeToWorld)
{
if(spotL->getBeacon() != NULL)
spotL->getBeacon()->getToWorld(matWorldToLight);
Matrixr matLightPos;
matLightPos.setTranslate(spotL->getPosition());
Matrixr matLightDir;
Quaternion rotLightDir(Vec3r(0.f, 0.f, 1.f), -spotL->getDirection());
matLightDir.setRotate(rotLightDir);
matWorldToLight.mult (matLightPos);
matWorldToLight.mult (matLightDir);
matWorldToLight.invert( );
matEyeToLight = matWorldToLight;
matEyeToLight.mult(matEyeToWorld);
}