shader修改

Assets/Shaders/VFX.shader

@@ -38,6 +38,7 @@ Properties {
     [UIMaskChannel] _DissolveChannel("通道", Float) = 3
     _Dissolve ("溶解进度", Range(0, 1.01)) = 0
     _DissolveWidth ("溶解宽度", Range(0, 1)) = 0
+    [CustomDataChannel] _DissolveCustomChannel ("自定义数据通道", Float) = 0
     // 默认黑色 = 不叠加任何颜色，保证新参数不影响原有溶解效果
     [HDR]_DissolveEdgeColor ("溶解边缘颜色", Color) = (0, 0, 0, 1)
     _DissolveEdgeSharpness ("边缘锐度 (越大越细)", Range(0.001, 8)) = 2
@@ -130,6 +131,7 @@ Category {
                 float _DissolveChannel;
                 fixed _Dissolve;
                 fixed _DissolveWidth;
+                float _DissolveCustomChannel;
                 fixed4 _DissolveEdgeColor;
                 fixed _DissolveEdgeSharpness;
                 fixed4 _DissolveHighlightColor;
@@ -144,6 +146,15 @@ Category {
                 return dot(c, w);
             }
 
+            // 通用模块：按通道号取粒子自定义数据（供"自定义数据通道"下拉框使用）
+            // channel: 0 = null（返回 0），1~4 = Custom1.xyzw，5~8 = Custom2.xyzw
+            inline float CustomDataChannelValue(float4 custom1, float4 custom2, float channel)
+            {
+                float4 w1 = 1.0 - saturate(abs(channel - float4(1.0, 2.0, 3.0, 4.0)));
+                float4 w2 = 1.0 - saturate(abs(channel - float4(5.0, 6.0, 7.0, 8.0)));
+                return dot(custom1, w1) + dot(custom2, w2);
+            }
+
             #if _USEUIMASKCLIP_ON
                 fixed4 _ClipRect;
             #endif
@@ -156,7 +167,10 @@ Category {
             struct appdata_t {
                 float4 vertex : POSITION;
                 fixed4 color : COLOR;
-                fixed4 texcoord : TEXCOORD0;
+                // 顶点流约定（渲染器 → 自定义顶点流，按此顺序）：UV, Custom1.xyzw, Custom2.xyzw
+                float4 texcoord : TEXCOORD0;    // UV.xy + Custom1.xy
+                float4 texcoord1 : TEXCOORD1;   // Custom1.zw + Custom2.xy
+                float4 texcoord2 : TEXCOORD2;   // Custom2.zw
                 UNITY_VERTEX_INPUT_INSTANCE_ID
             };
 
@@ -165,6 +179,9 @@ Category {
                 fixed4 color : COLOR;
                 fixed4 texcoord : TEXCOORD0;
 
+                float4 customData : TEXCOORD1;    // Custom1.xyzw
+                float4 customData2 : TEXCOORD6;   // Custom2.xyzw
+
                 #if _USEMASK_ON
                     fixed2 texcoordMask : TEXCOORD2;
                 #endif
@@ -202,6 +219,10 @@ Category {
                 o.texcoord.xy = TRANSFORM_TEX(v.texcoord,_MainTex);
                 o.texcoord.zw = v.texcoord.zw;
 
+                // 把打包在各 texcoord 里的粒子自定义数据还原成 Custom1.xyzw / Custom2.xyzw
+                o.customData  = float4(v.texcoord.z,  v.texcoord.w,  v.texcoord1.x, v.texcoord1.y);
+                o.customData2 = float4(v.texcoord1.z, v.texcoord1.w, v.texcoord2.x, v.texcoord2.y);
+
                 #if _USEMASK_ON
                     o.texcoordMask = TRANSFORM_TEX(v.texcoord,_Mask);
                 #endif
@@ -250,7 +271,11 @@ Category {
                 #endif
 
                 #if _USEDISSOLVE_ON
-                    fixed DissolveWithParticle =(_Dissolve*(1-i.texcoord.z)*(1+_DissolveWidth)-_DissolveWidth) ;
+                    // 溶解进度 = 滑条 × 选中的自定义数据通道；通道 = null 时完全用滑条（保持原行为）
+                    fixed customProgress = CustomDataChannelValue(i.customData, i.customData2, _DissolveCustomChannel);
+                    fixed useCustom = step(0.5, _DissolveCustomChannel);
+                    fixed dissolveProgress = _Dissolve * lerp(1.0, customProgress, useCustom);
+                    fixed DissolveWithParticle =(dissolveProgress*(1+_DissolveWidth)-_DissolveWidth) ;
                     fixed dissolveMap = UIMaskSampleChannel(_DissolveTex, i.texcoordDissolve, _DissolveChannel);
                     fixed dissolveAlpha = saturate(smoothstep( DissolveWithParticle, (DissolveWithParticle+_DissolveWidth), dissolveMap));
                     col.a *= dissolveAlpha;