6天前
我已经用shader实现了正片叠底的效果，但是柔光的脚本一丢进去就报错。
Shader "Custom/SceneMultiplyBlend"
{
Properties
{
_MultiplyTex ("正片叠底图层", 2D) = "white" {}
_MultiplyOpacity ("正片叠底不透明度", Range(0,1)) = 1.0
_MultiplyStrength ("正片叠底强度", Range(0,2)) = 1.0
_MultiplyScale ("正片叠底缩放", Range(0.1,2)) = 1
_MultiplyOffset ("正片叠底位置", Vector) = (0,0,0,0)
}
SubShader
{
Tags { "RenderType"="Transparent" "Queue"="Overlay" "IgnoreProjector"="True" }
Blend DstColor Zero
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
float4 color : COLOR;
};
struct v2f
{
float2 uv : TEXCOORD0;
float4 vertex : SV_POSITION;
float4 color : COLOR;
};
sampler2D _MultiplyTex;
float4 _MultiplyTex_ST;
float _MultiplyOpacity;
float _MultiplyStrength;
float _MultiplyScale;
float4 _MultiplyOffset;
v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv = TRANSFORM_TEX(v.uv, _MultiplyTex);
o.color = v.color;
return o;
}
fixed4 frag (v2f i) : SV_Target
{
float2 multiplyUV = (i.uv - 0.5) * _MultiplyScale + 0.5 + _MultiplyOffset.xy;
multiplyUV = saturate(multiplyUV);
fixed4 multiplyColor = tex2D(_MultiplyTex, multiplyUV);
fixed4 finalColor = fixed4(1, 1, 1, 1);
finalColor.rgb = lerp(finalColor.rgb, multiplyColor.rgb * _MultiplyStrength, multiplyColor.a * _MultiplyOpacity);
return finalColor * i.color;
}
ENDCG
}
}
}
我想在unity中模仿ps一样的效果
这个是柔光的脚本
Shader "Custom/SceneSoftLightBlend"
{
Properties
{
_MainTex ("主纹理", 2D) = "white" {}
_BlendTex ("柔光纹理", 2D) = "white" {}
_BlendAmount ("柔光强度", Range(0,1)) = 1
_Opacity ("不透明度", Range(0,1)) = 1
}
SubShader
{
Tags
{
"Queue" = "Transparent"
"RenderType" = "Transparent"
"PreviewType" = "Plane"
"CanUseSpriteAtlas" = "True"
}
Cull Off
Lighting Off
ZWrite Off
Blend One OneMinusSrcAlpha
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct appdata_t
{
float4 vertex : POSITION;
float4 color : COLOR;
float2 texcoord : TEXCOORD0;
};
struct v2f
{
float4 vertex : SV_POSITION;
fixed4 color : COLOR;
float2 texcoord : TEXCOORD0;
};
sampler2D _MainTex;
sampler2D _BlendTex;
float4 _MainTex_ST;
float4 _BlendTex_ST;
fixed _BlendAmount;
fixed _Opacity;
// 柔光混合函数
fixed3 SoftLight(fixed3 base, fixed3 blend)
{
fixed3 result;
UNITY_UNROLL
for(int i = 0; i < 3; i++)
{
if(blend[i] <= 0.5)
{
result[i] = base[i] - (1 - 2 * blend[i]) * base[i] * (1 - base[i]);
}
else
{
fixed D = (base[i] <= 0.25) ?
((16 * base[i] - 12) * base[i] + 4) * base[i] :
sqrt(base[i]);
result[i] = base[i] + (2 * blend[i] - 1) * (D - base[i]);
}
}
return result;
}
v2f vert(appdata_t IN)
{
v2f OUT;
OUT.vertex = UnityObjectToClipPos(IN.vertex);
OUT.texcoord = TRANSFORM_TEX(IN.texcoord, _MainTex);
OUT.color = IN.color;
return OUT;
}
fixed4 frag(v2f IN) : SV_Target
{
// 采样纹理
fixed4 mainColor = tex2D(_MainTex, IN.texcoord) * IN.color;
fixed4 blendColor = tex2D(_BlendTex, IN.texcoord);
// 应用柔光混合
fixed3 softLightColor = SoftLight(mainColor.rgb, blendColor.rgb);
// 在原始颜色和柔光结果之间插值
fixed3 finalColor = lerp(mainColor.rgb, softLightColor, _BlendAmount * blendColor.a);
// 处理透明度
fixed alpha = mainColor.a * _Opacity;
// 预乘alpha
finalColor *= alpha;
return fixed4(finalColor, alpha);
}
ENDCG
}
}
}
写不出来，这个柔光不能用的，进去以后底是白的，应该是希望一张图进去就能和背景计算，就像在ps里改图层效果变成柔光一样，问ai改了也还是这样。
不知道怎么用shader把一张图和它的背景图计算。
