我对着色器编程毫无头绪,但现在我需要给我想要使用的着色器添加透明度。实际上,我想让我的精灵淡入和淡出,但这并不包含在我正在使用的着色器中。
着色器:
Shader "Sprites/ClipArea2Sides"
{
Properties
{
_MainTex ("Base (RGB), Alpha (A)", 2D) = "white" {}
_Length ("Length", Range(0.0, 1.0)) = 1.0
_Width ("Width", Range(0.0, 1.0)) = 1.0
}
SubShader
{
LOD 200
Tags
{
"Queue" = "Transparent"
"IgnoreProjector" = "True"
"RenderType" = "Transparent"
}
Pass
{
Cull Off
Lighting Off
ZWrite Off
Offset -1, -1
Fog { Mode Off }
ColorMask RGB
Blend SrcAlpha OneMinusSrcAlpha
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
sampler2D _MainTex;
float4 _MainTex_ST;
float _Length;
float _Width;
struct appdata_t
{
float4 vertex : POSITION;
float2 texcoord : TEXCOORD0;
};
struct v2f
{
float4 vertex : POSITION;
float2 texcoord : TEXCOORD0;
};
v2f vert (appdata_t v)
{
v2f o;
o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
o.texcoord = v.texcoord;
return o;
}
half4 frag (v2f IN) : COLOR
{
if ((IN.texcoord.x<0) || (IN.texcoord.x>_Width) || (IN.texcoord.y<0) || (IN.texcoord.y>_Length))
{
half4 colorTransparent = half4(0,0,0,0) ;
return colorTransparent ;
}
else
return tex2D(_MainTex, IN.texcoord) ;
}
ENDCG
}
}
}
像这样的着色器:http://wiki.unity3d.com/index.php/UnlitAlphaWithFade
因为性能问题,我需要优化移动设备上的alpha值。
回答:
非常感谢Anas iqbal。
这是一个带有剪辑区域和颜色调整的着色器:
Shader "Sprites/TestShader"
{
Properties
{
_Color ("Color Tint", Color) = (1,1,1,1)
_MainTex ("Base (RGB), Alpha (A)", 2D) = "white" {}
_Length ("Length", Range(0.0, 1.0)) = 1.0
_Width ("Width", Range(0.0, 1.0)) = 1.0
}
SubShader
{
LOD 200
Tags
{
"Queue" = "Transparent"
"IgnoreProjector" = "True"
"RenderType" = "Transparent"
}
Pass
{
Cull Off
Lighting Off
ZWrite Off
Offset -1, -1
Fog { Mode Off }
ColorMask RGB
Blend SrcAlpha OneMinusSrcAlpha
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
sampler2D _MainTex;
float4 _MainTex_ST;
float _Length;
float _Width;
half4 _Color;
struct appdata_t
{
float4 vertex : POSITION;
float2 texcoord : TEXCOORD0;
};
struct v2f
{
float4 vertex : POSITION;
float2 texcoord : TEXCOORD0;
half4 color : COLOR;
};
v2f vert (appdata_t v)
{
v2f o;
o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
o.texcoord = v.texcoord;
o.color = _Color;
return o;
}
half4 frag (v2f IN) : COLOR
{
if ((IN.texcoord.x<0) || (IN.texcoord.x>_Width) || (IN.texcoord.y<0) || (IN.texcoord.y>_Length))
{
half4 colorTransparent = half4(0,0,0,0) ;
return colorTransparent;
}
else
{
half4 tex = tex2D(_MainTex, IN.texcoord);
tex.a = IN.color.a;
return tex;
}
}
ENDCG
}
}
}
return colorTransparent
和return tex2D(_MainTex, IN.texcoord)
,我想在我的脚本中编辑材质的alpha通道。 - ATHellboyreturn colorTransparent;
将返回没有 alpha(透明/无颜色)的黑色。而return tex2D(_MainTex, IN.texcoord)
将返回纹理的颜色。因此,如果您想调整纹理的 alpha 值,则可以执行half4 tex = tex2D(_MainTex, IN.texcoord); tex.a = IN.color.a; return tex;
这将把纹理的 alpha 值更改为您设置的颜色的 alpha 值。 - Anas iqbal