逐片元-兰伯特光照模型

Shader "QStudyShader/Per_Fragment_LambertLaw"
{
    
    Properties{
    

    }
    SubShader{
    
        Pass{
    
            Tags{
     "LightModel" = "ForwardBase"}
            CGPROGRAM
            #include "Lighting.cginc"
            #pragma vertex Vertex
            #pragma fragment Fragment
            struct a2v {
    
                float4 vertex : POSITION;
                float3 normal : NORMAL;
            };
            struct v2f {
    
                float4 pos : SV_POSITION;
                float3 worldNormal : TEXCOORD0;
            };
            v2f Vertex(a2v v) {
    
                v2f o;
                o.pos = UnityObjectToClipPos(v.vertex);
                o.worldNormal = UnityObjectToWorldNormal(v.normal);
                return o;
            }
            fixed4 Fragment(v2f i) :SV_TARGET{
    
                fixed3 worldNormal = normalize(i.worldNormal);
                fixed3 worldLightDir = normalize(_WorldSpaceLightPos0.xyz);
                fixed3 diffuse = _LightColor0.xyz * max(0, dot(worldNormal,worldLightDir));
                fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz;
                return fixed4(diffuse + ambient, 1.0);
            }
            ENDCG
        }
    }
}