Add opacity import

Assets/vfx-graph-gs/SplatData.cs

@@ -74,7 +74,7 @@ namespace SplatVfx
                 // _cachedBuffers.scale.SetData(ScaleArray);
                 // _cachedBuffers.rotation.SetData(RotationArray);
                 // _cachedBuffers.color.SetData(ColorArray);
-                // _cachedBuffers.opacity.SetData(OpacityArray);
+                _cachedBuffers.opacity.SetData(OpacityArray);
                 // _cachedBuffers.sh.SetData(SHArray);
             }
             return _cachedBuffers;

Assets/vfx-graph-gs/SplatDataBinder.cs

@@ -30,6 +30,10 @@ namespace SplatVfx
         //   { get => (string)_colorBufferProperty;
         //     set => _colorBufferProperty = value; }
 
+        public string OpacityBufferProperty
+          { get => (string)_opacityBufferProperty;
+            set => _opacityBufferProperty = value; }
+
         // [VFXPropertyBinding("System.UInt32"), SerializeField]
         // ExposedProperty _splatCountProperty = "SplatCount";
 
@@ -42,6 +46,9 @@ namespace SplatVfx
         // [VFXPropertyBinding("UnityEngine.GraphicsBuffer"), SerializeField]
         // ExposedProperty _colorBufferProperty = "ColorBuffer";
 
+        [VFXPropertyBinding("UnityEngine.GraphicsBuffer"), SerializeField]
+        ExposedProperty _opacityBufferProperty = "OpacityBuffer";
+
         public override bool IsValid(VisualEffect component)
           => SplatData != null &&
              //  component.HasUInt(_splatCountProperty) &&
@@ -55,6 +62,7 @@ namespace SplatVfx
             component.SetGraphicsBuffer(_positionBufferProperty, SplatData.PositionBuffer);
             // component.SetGraphicsBuffer(_axisBufferProperty, SplatData.AxisBuffer);
             // component.SetGraphicsBuffer(_colorBufferProperty, SplatData.ColorBuffer);
+            component.SetGraphicsBuffer(_opacityBufferProperty, SplatData.OpacityBuffer);
         }
 
         // public override string ToString()

Assets/vfx-graph-gs/SplatImporter.cs

@@ -28,6 +28,7 @@ using Unity.Collections;
         5. Use a struct for header_info
         6. Write handler for data other than 32 bit float
         7. Pass around Span<byte> instead of byte[] for memory safety
+        8. Implement opacity clamping in the VFX Graph
 *******************************************************************************/
 
 namespace SplatVfx.Editor
@@ -178,6 +179,11 @@ namespace SplatVfx.Editor
                         case "z":
                             splatData.PositionArray[i].z = val;
 
+                            break;
+
+                        case "opacity":
+                            splatData.OpacityArray[i] = 255 / (1 + math.exp(-val));
+
                             break;
                     }
                 }

Assets/vfx-graph-gs/SplatVFX.vfx

@@ -68,10 +68,10 @@ MonoBehaviour:
   categories: []
   uiBounds:
     serializedVersion: 2
-    x: 283
+    x: 282
     y: -492
-    width: 871
+    width: 872
-    height: 1065
+    height: 1139
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@@ -93,6 +93,9 @@ MonoBehaviour:
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@@ -114,6 +117,21 @@ MonoBehaviour:
     max: Infinity
     enumValues: []
     descendantCount: 0
+  - name: OpacityBuffer
+    path: 
+    tooltip: 
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+    spaceable: 0
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+    max: Infinity
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+    descendantCount: 0
   m_ImportDependencies: []
   m_GraphVersion: 19
   m_ResourceVersion: 1
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