id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
21	Volumetric light	gongminmin	gongminmin	post process实现volumetric light效果，参考GPU Gems 3第13章：http://http.developer.nvidia.com/GPUGems3/gpugems3_ch13.html	task	new	major		Core-Rendering system