class LightingModel { start( /*input, stack, builder*/ ) { } finish( /*input, stack, builder*/ ) { } direct( /*input, stack, builder*/ ) { } directRectArea( /*input, stack, builder*/ ) {} indirect( /*input, stack, builder*/ ) { } ambientOcclusion( /*input, stack, builder*/ ) { } } export default LightingModel;