unity shader实现较完整光照效果

// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'Shader "Unlit/lightFull"{ Properties { _MainTex ("Texture", 2D) = "white" {} } SubShader { Tags { "RenderType"="Opaque" } LOD 100 Pass { Tags{"LightMode" = "ForwardBase"} CGPROGRAM #pragma vertex vert #pragma fragment frag // make fog work #pragma multi_compile_fwdbase  #include "UnityCG.cginc" #include "Lighting.cginc" #include "AutoLight.cginc" struct appdata { float4 vertex : POSITION; float2 uv : TEXCOORD0; float3 normal : NORMAL; }; struct v2f { float2 uv : TEXCOORD0; float4 pos : POSITION; float4 pos_world : TEXCOORD1; float3 normal:TEXCOORD2; SHADOW_COORDS(3) }; sampler2D _MainTex; float4 _MainTex_ST;  v2f vert (appdata v) { v2f o; o.pos_world = mul(UNITY_MATRIX_M, v.vertex); o.normal = v.normal; o.pos = UnityObjectToClipPos(v.vertex); o.uv = TRANSFORM_TEX(v.uv, _MainTex); TRANSFER_SHADOW(o); return o; }  fixed4 frag (v2f i) : SV_Target { // sample the texture fixed4 col = tex2D(_MainTex, i.uv); float4 lightColor = _LightColor0; float3 lightDir = WorldSpaceLightDir(i.pos_world); UNITY_LIGHT_ATTENUATION(atten, i, i.pos_world.xyz); return col * lightColor * saturate(dot(lightDir, i.normal)) * atten; } ENDCG } pass { Tags{"LightMode" = "ForwardAdd"} Blend One One CGPROGRAM #pragma vertex vert #pragma fragment frag #pragma multi_compile_fwdadd_fullshadows  #include "UnityCG.cginc" #include "Lighting.cginc" #include "AutoLight.cginc" struct v2f { float4 pos : POSITION; float4 vertex : TEXCOORD0; float3 normal : NORMAL; SHADOW_COORDS(2) }; v2f vert(appdata_full data) { v2f v; v.pos = UnityObjectToClipPos(data.vertex); v.vertex = mul(UNITY_MATRIX_M, data.vertex); v.normal = data.normal; TRANSFER_SHADOW(v); return v; } float4 frag(v2f v) :SV_Target { float3 lightColor = _LightColor0;#ifdef USING_DIRECTIONAL_LIGHT float3 lightDir = _WorldSpaceLightPos0;#else float3 lightDir = _WorldSpaceLightPos0 - v.vertex;#endif UNITY_LIGHT_ATTENUATION(atten, v, v.vertex.xyz); float3 color = lightColor * saturate(dot(lightDir, v.normal) * atten); return float4(color, 1); } ENDCG } } Fallback "Specular"}