lambertDiffuse_vertex.shader

Shader "LX/lambertDiffuse_vertex"
{
    Properties
    {
        _Diffuse("Diffuse",Color)=(1,1,1,1)
    }
    SubShader
    {
        Pass
        {
            Tags
            {
                "LightMode"="ForwardBase"
            }
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "Lighting.cginc"

            fixed4 _Diffuse;

            struct a2v
            {
                float4 position : POSITION;
                float3 normal : NORMAL;
            };

            struct v2f
            {
                float4 pos : SV_POSITION;
                fixed3 color:COLOR;
            };


            v2f vert(a2v vertData)
            {
                v2f o;
                o.pos = UnityObjectToClipPos(vertData.position);
                //获取在unity编辑器中定义的环境光
                fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz;
                //把顶点法线变换到世界坐标系下
                fixed3 worldNormal = normalize(mul(unity_ObjectToWorld, vertData.normal));
                //获取光照方向
                fixed3 worldLight = normalize(_WorldSpaceLightPos0.xyz);
                fixed3 diffuse =_LightColor0.rgb * _Diffuse.rgb * saturate(dot(worldNormal, worldLight));

                o.color = diffuse + ambient;
                return o;
            }

            fixed4 frag(v2f i) : SV_Target
            {
                return fixed4(i.color, 1);
            }
            ENDCG
        }
    }
}