Added step and clip material for blitting the particles

Assets/Metaballs/Shaders/Shader Graphs_StepAndClip.mat

@@ -0,0 +1,48 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!21 &2100000
+Material:
+  serializedVersion: 6
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_Name: Shader Graphs_StepAndClip
+  m_Shader: {fileID: -6465566751694194690, guid: f68ffba8030502749b8eb867430ed4a1, type: 3}
+  m_ShaderKeywords: 
+  m_LightmapFlags: 4
+  m_EnableInstancingVariants: 0
+  m_DoubleSidedGI: 0
+  m_CustomRenderQueue: -1
+  stringTagMap: {}
+  disabledShaderPasses: []
+  m_SavedProperties:
+    serializedVersion: 3
+    m_TexEnvs:
+    - _MainTex:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - unity_Lightmaps:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - unity_LightmapsInd:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - unity_ShadowMasks:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    m_Floats:
+    - Vector1_0a49465ed8764116bcddbe17a19921e4: 0
+    - Vector1_c0765b0f9fbd45cc93f29b42dc9c50dd: 0
+    - Vector1_dc4dddd7e6c04cb0b10ba5b78324fa22: 0
+    - _AlphaStep: 0.44
+    - _AlphaStep2: 1
+    - _Clip: 0.33
+    - _ColorStep: 0.13
+    - _ColorStep2: 0.88
+    m_Colors: []
+  m_BuildTextureStacks: []

Assets/Metaballs/Shaders/Shader Graphs_StepAndClip.mat.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 95391282e3f31ef4dada9756b388d99d
+NativeFormatImporter:
+  externalObjects: {}
+  mainObjectFileID: 2100000
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Metaballs/Shaders/StepAndClip.shadergraph.meta

@@ -0,0 +1,10 @@
+fileFormatVersion: 2
+guid: f68ffba8030502749b8eb867430ed4a1
+ScriptedImporter:
+  internalIDToNameTable: []
+  externalObjects: {}
+  serializedVersion: 2
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
+  script: {fileID: 11500000, guid: 625f186215c104763be7675aa2d941aa, type: 3}

Assets/Settings/CustomForwardRendererData.asset

@@ -96,7 +96,7 @@ MonoBehaviour:
   m_Name: RenderMetaballsScreenSpace
   m_EditorClassIdentifier: 
   m_Active: 1
-  blitMaterial: {fileID: 2100000, guid: ba62d2f9845041e498edc0cfd32a8813, type: 2}
+  blitMaterial: {fileID: 2100000, guid: 95391282e3f31ef4dada9756b388d99d, type: 2}
   renderObjectsSettings:
     passTag: RenderMetaballsScreenSpace
     Event: 400