unity3d中实现Hemisphere Lighting

来源：互联网发布：张学友陈奕迅知乎编辑：程序博客网时间：2024/06/05 05:13

参考资料：http://www.yaldex.com/open-gl/ch12lev1sec1.html

效果图：

代码：

Shader "Custom/Hemisphere_Lighting" {Properties {    _MainTex ("Texture", 2D) = "white" {}_SkyColor("Sky Color",Color)=(1,1,1,1)_GroundColor("Ground Color",Color)=(0,0,0,1)}SubShader {    Pass {CGPROGRAM#pragma vertex vert#pragma fragment frag#include "UnityCG.cginc"float4 _SkyColor;float4 _GroundColor;sampler2D _MainTex;struct v2f {float4  pos : SV_POSITION;float2  uv : TEXCOORD0;fixed4 color : COLOR0;};float4 _MainTex_ST;v2f vert (appdata_base v){v2f o;o.pos = mul (UNITY_MATRIX_MVP, v.vertex);o.uv = TRANSFORM_TEX (v.texcoord, _MainTex);fixed3 tnorm=mul(fixed4(v.normal,1),UNITY_MATRIX_MVP);float costheta = dot(tnorm, fixed3(0,1,0));float a = 0.5 + 0.5 * costheta;o.color=_SkyColor*a+(1-a)*_GroundColor;return o;}half4 frag (v2f i) : COLOR{half4 texcol = tex2D (_MainTex, i.uv);texcol.r*=i.color.r;texcol.g*=i.color.g;texcol.b*=i.color.b;return texcol;}ENDCG    }}Fallback "VertexLit"}