原标题：干货 | UnityShader Demo01之冰块材质

原理——使用法线贴图扭曲透明颜色贴图的uv值。

代码如下：

Shader"PengLu/normal/iceTrans" {

Properties {

_Color ("Main Color", Color) = (1,1,1,1)

_MainTex ("BaseTex ", 2D) = "white" {}

_BumpMap ("Normalmap", 2D) = "bump" {}

_BumpAmt ("Distortion", range (0,2)) = 0.1

}

SubShader {

Tags { "Queue"="Transparent""RenderType"="Opaque" }

ZWrite off

CGPROGRAM

#pragma surface surfLambert nolightmap nodirlightmap alpha:blend

sampler2D _BumpMap;

sampler2D _MainTex;

float4 _Color;

float _BumpAmt;

struct Input {

float2 uv_MainTex;

float2 uv_BumpMap;

};

void surf (Input IN,inout SurfaceOutput o) {

fixed3 nor = UnpackNormal (tex2D(_BumpMap, IN.uv_BumpMap));

fixed4 trans =tex2D(_MainTex,IN.uv_MainTex+nor.xy*_BumpAmt)*_Color;

o.Albedo = trans.rgb;

o.Alpha =trans.a;

o.Emission = trans;

}

ENDCG

}

FallBack"Transparent/VertexLit"

}

surface版本 shader代码：

Shader "PengLu/Custom/iceRefrationSurf" {

Properties {

_Color ("Main Color", Color) = (1,1,1,1)

_MainTex ("BaseTex", 2D) = "white" {}

_BumpMap ("Normalmap", 2D) = "bump" {}

_BumpAmt ("Distortion", range (0,1)) = 0.12

}

SubShader {

Tags { "Queue"="Transparent" "RenderType"="Opaque" }

ZWrite off

Lighting off

GrabPass {

Name "BASE"

Tags { "LightMode" = "Always" }

}

CGPROGRAM

#pragma surface surf Lambert nolightmap nodirlightmap

#pragma target 3.0

#pragma debug

float4 _Color;

sampler2D _MainTex;

sampler2D _BumpMap;

sampler2D _GrabTexture;

float _BumpAmt;

struct Input {

float2 uv_MainTex;

float2 uv_BumpMap;

float4 screenPos;

};void surf (Input IN, inout SurfaceOutput o) {

fixed3 nor = UnpackNormal (tex2D(_BumpMap, IN.uv_BumpMap));

fixed4 col = tex2D(_MainTex,IN.uv_MainTex);

float4 screenUV2 = IN.screenPos;

screenUV2.xy = screenUV2.xy / screenUV2.w;

screenUV2.xy += nor.xy * _BumpAmt;

fixed4 trans = tex2D(_GrabTexture,screenUV2.xy)*_Color;

trans*=col;

o.Albedo = trans.rgb;

o.Emission = trans.rgb;}

ENDCG

}

FallBack "Transparent/VertexLit"

}

surface版本目前还有问题，在编辑视图里面结果是对的，但是再camera显示不正确。暂时能力不够没找到方法修改。

责任编辑：