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unity中自带的shader里有Cutout类型的shader，今天发现这种类型很诡异，先
贴几种自带的：
// Unlit alpha-cutout shader.
// – no lighting
// – no lightmap support
// – no per-material color
Shader “Unlit/Transparent Cutout” {
Properties {
_MainTex (“Base (RGB) Trans (A)”, 2D) = “white” {}
_Cutoff (“Alpha cutoff”, Range(0,1)) = 0.5
}
SubShader {
Tags {“Queue”=”AlphaTest” “IgnoreProjector”=”True” “RenderType”=”TransparentCutout”}
LOD 100
Lighting Off
Pass {
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include “UnityCG.cginc”
struct appdata_t {
float4 vertex : POSITION;
float2 texcoord : TEXCOORD0;
};
struct v2f {
float4 vertex : SV_POSITION;
half2 texcoord : TEXCOORD0;
};
sampler2D _MainTex;
float4 _MainTex_ST;
fixed _Cutoff;
v2f vert (appdata_t v)
{
v2f o;
o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);
return o;
}
fixed4 frag (v2f i) : COLOR
{
fixed4 col = tex2D(_MainTex, i.texcoord);
clip(col.a – _Cutoff);
return col;
}
ENDCG
}
}
}
Shader “Transparent/Cutout/Diffuse” {
Properties {
_Color (“Main Color”, Color) = (1,1,1,1)
_MainTex (“Base (RGB) Trans (A)”, 2D) = “white” {}
_Cutoff (“Alpha cutoff”, Range(0,1)) = 0.5
}
SubShader {
Tags {“Queue”=”AlphaTest” “IgnoreProjector”=”True” “RenderType”=”TransparentCutout”}
LOD 200
CGPROGRAM
#pragma surface surf Lambert alphatest:_Cutoff
sampler2D _MainTex;
fixed4 _Color;
struct Input {
float2 uv_MainTex;
};
void surf (Input IN, inout SurfaceOutput o) {
fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
o.Albedo = c.rgb;
o.Alpha = c.a;
}
ENDCG
}
Fallback “Transparent/Cutout/VertexLit”
}
Shader “Transparent/Diffuse” {
Properties {
_Color (“Main Color”, Color) = (1,1,1,1)
_MainTex (“Base (RGB) Trans (A)”, 2D) = “white” {}
}
SubShader {
Tags {“Queue”=”Transparent” “IgnoreProjector”=”True” “RenderType”=”Transparent”}
LOD 200
CGPROGRAM
#pragma surface surf Lambert alpha
sampler2D _MainTex;
fixed4 _Color;
struct Input {
float2 uv_MainTex;
};
void surf (Input IN, inout SurfaceOutput o) {
fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
o.Albedo = c.rgb;
o.Alpha = c.a;
}
ENDCG
}
Fallback “Transparent/VertexLit”
}
我现在做的某个项目，模型需要用transparent/diffuse的效果，但是有的建筑窗户是贴图，贴图中的边缘导入时alpha是0，
我综合上述代码写了个shader，能再电脑上的unity的Android平台上运行，但是在手机上会死机。。Android手机只能同时支持
lightmap，Alphatest，ZTest 中的两种。
Shader “Custom/TranDifExt” {
Properties {
_Color (“Main Color”, Color) = (1,1,1,1)
_MainTex (“Base (RGB) Trans (A)”, 2D) = “white” {}
_Cutoff (“Alpha cutoff”, Range(0,1)) = 0.5
}
SubShader {
Tags {“Queue”=”AlphaTest” “IgnoreProjector”=”True” “RenderType”=”TransparentCutout”}
LOD 200
CGPROGRAM
//#pragma surface surf Lambert alpha
#pragma surface surf Lambert
#include “UnityCG.cginc”
sampler2D _MainTex;
fixed4 _Color;
fixed _Cutoff;
struct Input {
float2 uv_MainTex;
};
void surf (Input IN, inout SurfaceOutput o) {
fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
o.Albedo = c.rgb;
o.Alpha = c.a;
clip(o.Alpha-_Cutoff);
}
ENDCG
}
Fallback “VertexLit”
}
然后又被同伙找了个shader：”Transparent/Cutout/VertexLit”，可以在手机Android上执行，同时有lightmap，Alphatest，ZTest 三种（不死机）
Shader “Transparent/Cutout/VertexLit” {
Properties {
_Color (“Main Color”, Color) = (1,1,1,1)
_SpecColor (“Spec Color”, Color) = (1,1,1,0)
_Emission (“Emissive Color”, Color) = (0,0,0,0)
_Shininess (“Shininess”, Range (0.1, 1)) = 0.7
_MainTex (“Base (RGB) Trans (A)”, 2D) = “white” {}
_Cutoff (“Alpha cutoff”, Range(0,1)) = 0.5
}
SubShader {
Tags {“Queue”=”AlphaTest” “IgnoreProjector”=”True” “RenderType”=”TransparentCutout”}
LOD 100
// Non-lightmapped
Pass {
Tags { “LightMode” = “Vertex” }
Alphatest Greater [_Cutoff]
AlphaToMask True
ColorMask RGB
Material {
Diffuse [_Color]
Ambient [_Color]
Shininess [_Shininess]
Specular [_SpecColor]
Emission [_Emission]
}
Lighting On
SeparateSpecular On
SetTexture [_MainTex] {
Combine texture * primary DOUBLE, texture * primary
}
}
// Lightmapped, encoded as dLDR
Pass {
Tags { “LightMode” = “VertexLM” }
Alphatest Greater [_Cutoff]
AlphaToMask True
ColorMask RGB
BindChannels {
Bind “Vertex”, vertex
Bind “normal”, normal
Bind “texcoord1”, texcoord0 // lightmap uses 2nd uv
Bind “texcoord”, texcoord1 // main uses 1st uv
}
SetTexture [unity_Lightmap] {
matrix [unity_LightmapMatrix]
constantColor [_Color]
combine texture * constant
}
SetTexture [_MainTex] {
combine texture * previous DOUBLE, texture * primary
}
}
// Lightmapped, encoded as RGBM
Pass {
Tags { “LightMode” = “VertexLMRGBM” }
Alphatest Greater [_Cutoff]
AlphaToMask True
ColorMask RGB
BindChannels {
Bind “Vertex”, vertex
Bind “normal”, normal
Bind “texcoord1”, texcoord0 // lightmap uses 2nd uv
Bind “texcoord1”, texcoord1 // unused
Bind “texcoord”, texcoord2 // main uses 1st uv
}
SetTexture [unity_Lightmap] {
matrix [unity_LightmapMatrix]
combine texture * texture alpha DOUBLE
}
SetTexture [unity_Lightmap] {
constantColor [_Color]
combine previous * constant
}
SetTexture [_MainTex] {
combine texture * previous QUAD, texture * primary
}
}
// Pass to render object as a shadow caster
Pass {
Name “Caster”
Tags { “LightMode” = “ShadowCaster” }
Offset 1, 1
Fog {Mode Off}
ZWrite On ZTest LEqual Cull Off
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile_shadowcaster
#include “UnityCG.cginc”
struct v2f {
V2F_SHADOW_CASTER;
float2 uv : TEXCOORD1;
};
uniform float4 _MainTex_ST;
v2f vert( appdata_base v )
{
v2f o;
TRANSFER_SHADOW_CASTER(o)
o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
return o;
}
uniform sampler2D _MainTex;
uniform fixed _Cutoff;
uniform fixed4 _Color;
float4 frag( v2f i ) : COLOR
{
fixed4 texcol = tex2D( _MainTex, i.uv );
clip( texcol.a*_Color.a – _Cutoff );
SHADOW_CASTER_FRAGMENT(i)
}
ENDCG
}
// Pass to render object as a shadow collector
Pass {
Name “ShadowCollector”
Tags { “LightMode” = “ShadowCollector” }
Fog {Mode Off}
ZWrite On ZTest LEqual
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile_shadowcollector
#define SHADOW_COLLECTOR_PASS
#include “UnityCG.cginc”
struct v2f {
V2F_SHADOW_COLLECTOR;
float2 uv : TEXCOORD5;
};
uniform float4 _MainTex_ST;
v2f vert (appdata_base v)
{
v2f o;
TRANSFER_SHADOW_COLLECTOR(o)
o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
return o;
}
uniform sampler2D _MainTex;
uniform fixed _Cutoff;
uniform fixed4 _Color;
fixed4 frag (v2f i) : COLOR
{
fixed4 texcol = tex2D( _MainTex, i.uv );
clip( texcol.a*_Color.a – _Cutoff );
SHADOW_COLLECTOR_FRAGMENT(i)
}
ENDCG
}
}
}
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