tandard

Shader有很多缺点所以我们把他转化为顶点片元着色器3、整理只保留主平行光的Shader效果4、精简后的最终代码

一、在Unity中按一下步骤准备

{}[NoScaleOffset]_MetallicTex(Metallic(R)

Smoothness(G)

{}[Normal]_NormalTex(NormalTex,2D)

bump

1.0}SubShader{Tags{RenderTypeOpaque}LOD

200//

multi_compile_instancing#pragma

_MainTex;float4

COLOR;UNITY_VERTEX_INPUT_INSTANCE_ID};//

vertex-to-fragment

TEXCOORD6;UNITY_FOG_COORDS(7)UNITY_SHADOW_COORDS(8)};//

vertex

UnityObjectToClipPos(v.vertex);o.uv.xy

_MainTex);float3

UnityObjectToWorldNormal(v.normal);//世界空间下的切线half3

worldTangent

UnityObjectToWorldDir(v.tangent);//切线方向half

tangentSign

unity_WorldTransformParams.w;//世界空间下的副切线half3

worldBinormal

!UNITY_SAMPLE_FULL_SH_PER_PIXELo.sh

0;//

unity_4LightPosZ0,unity_LightColor[0].rgb,

unity_LightColor[3].rgb,unity_4LightAtten0,

worldPos,

o.sh);#endifUNITY_TRANSFER_LIGHTING(o,

v.texcoord1.xy);UNITY_TRANSFER_FOG(o,

o.pos);

SV_Target{UNITY_EXTRACT_FOG(i);float3

worldPos

normalize(UnityWorldSpaceViewDir(worldPos));SurfaceOutputStandard

o;UNITY_INITIALIZE_OUTPUT(SurfaceOutputStandard,

o);fixed4

UnpackNormal(tex2D(_NormalTex,i.uv));half3

worldNormal

half3(dot(i.tSpace0,normalTex),dot(i.tSpace1,normalTex),dot(i.tSpace2,normalTex));o.Normal

worldNormal;//

factorUNITY_LIGHT_ATTENUATION(atten,

worldPos)//

gi;UNITY_INITIALIZE_OUTPUT(UnityGI,

0;gi.light.color

giInput;UNITY_INITIALIZE_OUTPUT(UnityGIInput,

atten;#if

defined(DYNAMICLIGHTMAP_ON)giInput.lightmapUV

IN.lmap;#elsegiInput.lightmapUV

0.0;#endif#if

!UNITY_SAMPLE_FULL_SH_PER_PIXELgiInput.ambient

unity_SpecCube0_HDR;giInput.probeHDR[1]

defined(UNITY_SPECCUBE_BLENDING)

defined(UNITY_SPECCUBE_BOX_PROJECTION)giInput.boxMin[0]

holds

UNITY_SPECCUBE_BOX_PROJECTIONgiInput.boxMax[0]

unity_SpecCube0_BoxMax;giInput.probePosition[0]

unity_SpecCube0_ProbePosition;giInput.boxMax[1]

unity_SpecCube1_BoxMax;giInput.boxMin[1]

unity_SpecCube1_BoxMin;giInput.probePosition[1]

unity_SpecCube1_ProbePosition;#endifLightingStandard_GI(o,

giInput,

gi);UNITY_APPLY_FOG(_unity_fogCoord,

c);