Fix strips outputs, spawnIndex and default metallic value

Author: julienf-unity

com.unity.render-pipelines.high-definition/Editor/VFXGraph/Outputs/VFXAbstractParticleHDRPLitOutput.cs

@@ -105,7 +105,7 @@ public class HDRPLitInputProperties
         public class StandardProperties
         {
             [Range(0, 1), Tooltip("Controls the scale factor for the particle’s metallicity.")]
-            public float metallic = 0.5f;
+            public float metallic = 0.0f;
         }
 
         public class SpecularColorProperties

com.unity.visualeffectgraph/CHANGELOG.md

@@ -10,6 +10,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Don't show the blocks window when context cant have blocks
 - Avoid NullReferenceException when VisualEffectAsset is null if VFXPropertyBinder [Case 1219061](https://issuetracker.unity3d.com/product/unity/issues/guid/1219061/)
 - Missing Reset function in VFXPropertyBinder [Case 1219063](https://issuetracker.unity3d.com/product/unity/issues/guid/1219063/)
+- Fix issue with strips outputs that could cause too many vertices to be renderered
+- SpawnIndex attribute returns correct value in update and outputs contexts
 
 ## [7.5.0] - 2020-06-08
 

com.unity.visualeffectgraph/Editor/Data/VFXData.cs

@@ -394,7 +394,9 @@ private void ComputeLayer()
 
         protected bool HasImplicitInit(VFXAttribute attrib)
         {
-            return (attrib.Equals(VFXAttribute.Seed) || attrib.Equals(VFXAttribute.ParticleId));
+            return attrib.Equals(VFXAttribute.Seed)
+                || attrib.Equals(VFXAttribute.ParticleId)
+                || attrib.Equals(VFXAttribute.SpawnIndex);
         }
 
         private void ProcessAttributes()

com.unity.visualeffectgraph/Editor/Models/Contexts/Implementations/VFXAbstractParticleOutput.cs

@@ -461,6 +461,8 @@ public override IEnumerable<VFXMapping> additionalMappings
                 yield return new VFXMapping("sortPriority", sortPriority);
                 if (HasIndirectDraw())
                     yield return new VFXMapping("indirectDraw", 1);
+                if (HasStrips(false))
+                    yield return new VFXMapping("strips", 1);
             }
         }
     }