关键词

[TOC2]

关键词

DYNAMICLIGHTMAP_ON

• 当物体的GI来源为LightMap

  

• 同时在Lighting中开启Realtime Global Illumination

  

• 此时Generate Lighting后, 该关键词才会激活

• 考虑到移动端的性能, 暂时去掉该功能, 以简化PBR基础着色器.

环境光BRDF优化

half3 EnvBRDFApprox( half3 SpecularColor, half Roughness, half NoV )
{
	const half4 c0 = { -1, -0.0275, -0.572, 0.022 };
	const half4 c1 = { 1, 0.0425, 1.04, -0.04 };
	half4 r = Roughness * c0 + c1;
	half a004 = min( r.x * r.x, exp2( -9.28 * NoV ) ) * r.x + r.y;
	half2 AB = half2( -1.04, 1.04 ) * a004 + r.zw;
	return SpecularColor * AB.x + AB.y;
}

Tag

Shader Tags（标签） - 知乎 (zhihu.com)

Physically Based Shading on Mobile - Unreal Engine