unity地形shader
unity中默认使用Hidden/TerrainEngine/Splatmap/Lightmap-FirstPass,这个shader进行地形贴图的渲染.
如果想替换下,可以建立shader,名字为Hidden/TerrainEngine/Splatmap/Lightmap-FirstPass.这样unity渲染时就会使用使用新的shader.
内置的shader,可以从unity官网下载.
下面提供一个例子:
Shader "Hidden/TerrainEngine/Splatmap/Lightmap-FirstPass" {Properties {_Control ("Control (RGBA)", 2D) = "red" {}_Splat3 ("Layer 3 (A)", 2D) = "white" {}_Splat2 ("Layer 2 (B)", 2D) = "white" {}_Splat1 ("Layer 1 (G)", 2D) = "white" {}_Splat0 ("Layer 0 (R)", 2D) = "white" {}// used in fallback on old cards_MainTex ("BaseMap (RGB)", 2D) = "white" {}_Color ("Main Color", Color) = (1,1,1,1)}SubShader {Tags {"SplatCount" = "4""Queue" = "Geometry-100""RenderType" = "Opaque"}CGPROGRAM#pragma surface surf Lambertstruct Input {float2 uv_Control : TEXCOORD0;float2 uv_Splat0 : TEXCOORD1;float2 uv_Splat1 : TEXCOORD2;float2 uv_Splat2 : TEXCOORD3;float2 uv_Splat3 : TEXCOORD4;};sampler2D _Control;sampler2D _Splat0,_Splat1,_Splat2,_Splat3;void surf (Input IN, inout SurfaceOutput o) {fixed4 splat_control = tex2D (_Control, IN.uv_Control);fixed3 col;float _Part = -0.25;float _Amount = 4;col = splat_control.r * tex2D (_Splat0, IN.uv_Splat0).rgb * (tex2D(_Splat0,IN.uv_Splat0 * _Part).rgb * _Amount);col += splat_control.g * tex2D (_Splat1, IN.uv_Splat1).rgb * (tex2D(_Splat1,IN.uv_Splat1 * _Part).rgb * _Amount);col += splat_control.b * tex2D (_Splat2, IN.uv_Splat2).rgb * (tex2D(_Splat3,IN.uv_Splat2 * _Part).rgb * _Amount);;col += splat_control.a * tex2D (_Splat3, IN.uv_Splat3).rgb * (tex2D(_Splat2,IN.uv_Splat3 * _Part).rgb * _Amount);;o.Albedo = col;o.Alpha = 0.0;}ENDCG }// Fallback to DiffuseFallback "Diffuse"}