{
modelMatrix.push();
// Render the ground plane.
{
modelMatrix.push();
glUseProgram( whiteDiffuseColor.theProgram );
glUniformMatrix4( whiteDiffuseColor.modelToCameraMatrixUnif, false,
modelMatrix.top().fillAndFlipBuffer( mat4Buffer ) );
Mat3 normMatrix = new Mat3( modelMatrix.top() );