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Author: PaulDemeulenaere

Assets/Editor/VFXCustomOutputMesh.cs

@@ -17,6 +17,8 @@ protected override IEnumerable<VFXPropertyWithValue> inputProperties
             {
                 foreach (var inputProperty in base.inputProperties)
                     yield return inputProperty;
+
+                //This yield return will automatically add a slot in this output.
                 yield return new VFXPropertyWithValue(new VFXProperty(typeof(float), "customDeformation"));
             }
         }
@@ -30,6 +32,7 @@ protected override IEnumerable<VFXNamedExpression> CollectGPUExpressions(IEnumer
             {
                 if (slot.name == "customDeformation")
                 {
+                    //It makes this value readable on GPU thanks to "${VFXLoadParameter:{customDeformation}}" in template.
                     yield return slot;
                     break;
                 }

Assets/Editor/VFXCustomOutputMesh.template

@@ -1,6 +1,7 @@
 {
     SubShader
     {
+        //N.B: This Assets include is only considered thanks to a hack in VFXCodeGenerator.cs(L314)
         ${VFXInclude("Assets/Editor/VFXCustomParticleHeader.template")}
         ${VFXIncludeRP("Templates/ParticleMeshesLit/PassSelection.template")}
         ${VFXIncludeRP("Templates/ParticleMeshesLit/PassDepth.template"),IS_OPAQUE_PARTICLE}