Lambert 光照模型

 1 Shader "JQM/Lambert"
 2 {
 3     Properties
 4     {
 5         _Color("Color", color) = (1.0,1.0,1.0,1.0)
 6     }
 7     SubShader{
 8         Pass{
 9             
10             Tags { "LightMode" = "ForwardBase"}
11 
12             CGPROGRAM
13             #pragma vertex vert
14             #pragma fragment frag
15 
16             //使用自定义变量
17             uniform float4 _Color;
18 
19             //使用Unity定义的变量
20             uniform float4 _LightColor0;
21 
22             struct vertexInput{
23                 float4 vertex:POSITION;
24                 float3 normal:NORMAL;
25             };
26 
27             struct vertexOutput{
28                 float4 pos:SV_POSITION;
29                 float4 col:COLOR;
30             };
31 
32             //顶点程序
33             vertexOutput vert(vertexInput v)
34             {
35                 vertexOutput o;
36                 
37                 float3 normalDirection = normalize( mul(float4(v.normal,0.0),_World2Object)).xyz;
38                 float3 lightDirection;
39                 float atten = 1.0;
40 
41                 lightDirection = normalize(_WorldSpaceLightPos0.xyz);
42                 
43                 float3 diffuseReflection = atten * _LightColor0.xyz *  max(0.0, dot(normalDirection,lightDirection));
44                 float3 lightFinal = diffuseReflection + UNITY_LIGHTMODEL_AMBIENT.xyz;
45 
46                 o.col = float4(lightFinal*_Color.rgb,1.0);
47                 o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
48                 return o;
49             }
50 
51             //片段程序
52             float4 frag(vertexOutput i):COLOR
53             {
54                 return i.col;
55             }
56 
57             ENDCG
58         }
59     }
60     
61 }