Method calcLightMatrices

Engine/source/lighting/shadowMap/lightShadowMap.cpp:162–243

}

void LightShadowMap::calcLightMatrices( MatrixF &outLightMatrix, const Frustum &viewFrustum )
{
   // Create light matrix, set projection

   switch ( mLight->getType() )
   {
   case LightInfo::Vector :
      {
         const ShadowMapParams *p = mLight->getExtended<ShadowMapParams>();

         // Calculate the bonding box of the shadowed area 
         // we're interested in... this is the shadow box 
         // transformed by the frustum transform.
         Box3F viewBB( -p->shadowDistance, -p->shadowDistance, -p->shadowDistance,
                        p->shadowDistance, p->shadowDistance, p->shadowDistance );
         viewFrustum.getTransform().mul( viewBB );

         // Calculate a light "projection" matrix.
         MatrixF lightMatrix = MathUtils::createOrientFromDir(mLight->getDirection());
         outLightMatrix = lightMatrix;
         static MatrixF rotMat(EulerF( (M_PI_F / 2.0f), 0.0f, 0.0f));
         lightMatrix.mul( rotMat );

         // This is the box in lightspace
         Box3F lightViewBB(viewBB);
         lightMatrix.mul(lightViewBB);

         // Now, let's position our light based on the lightViewBB
         Point3F newLightPos(viewBB.getCenter());
         F32 sceneDepth = lightViewBB.maxExtents.z - lightViewBB.minExtents.z;
         newLightPos += mLight->getDirection() * ((-sceneDepth / 2.0f)-1.0f);         // -1 for the nearplane
         outLightMatrix.setPosition(newLightPos);

         // Update light info
         mLight->setRange( sceneDepth );
         mLight->setPosition( newLightPos );

         // Set our ortho projection
         F32 width = (lightViewBB.maxExtents.x - lightViewBB.minExtents.x) / 2.0f;
         F32 height = (lightViewBB.maxExtents.y - lightViewBB.minExtents.y) / 2.0f;

         width = getMax(width, height);

         GFX->setOrtho(-width, width, -width, width, 1.0f, sceneDepth, true);


         // TODO: Width * 2... really isn't that pixels being used as
         // meters?  Is a real physical metric of scene depth better?         
         //SceneManager::setVisibleDistance(width * 2.0f);

#if 0
         DebugDrawer::get()->drawFrustum(viewFrustum, ColorF(1.0f, 0.0f, 0.0f));
         DebugDrawer::get()->drawBox(viewBB.minExtents, viewBB.maxExtents, ColorF(0.0f, 1.0f, 0.0f));
         DebugDrawer::get()->drawBox(lightViewBB.minExtents, lightViewBB.maxExtents, ColorF(0.0f, 0.0f, 1.0f));
         DebugDrawer::get()->drawBox(newLightPos - Point3F(1,1,1), newLightPos + Point3F(1,1,1), ColorF(1,1,0));
         DebugDrawer::get()->drawLine(newLightPos, newLightPos + mLight.mDirection*3.0f, ColorF(0,1,1));

         Point3F a(newLightPos);