Leaves

Assets/Scenes/SampleScene.unity

@@ -152,11 +152,12 @@ MonoBehaviour:
   m_EditorClassIdentifier: 
   depth: 8
   mesh: {fileID: 10207, guid: 0000000000000000e000000000000000, type: 0}
+  leafMesh: {fileID: 10202, guid: 0000000000000000e000000000000000, type: 0}
   material: {fileID: 2100000, guid: 8f3914ac4291e664ba60ae208ae66460, type: 2}
   gradientA:
     serializedVersion: 2
-    key0: {r: 1, g: 1, b: 1, a: 1}
-    key1: {r: 1, g: 0, b: 0, a: 1}
+    key0: {r: 1, g: 1, b: 1, a: 0.3137255}
+    key1: {r: 1, g: 0, b: 0, a: 0.3529412}
     key2: {r: 0, g: 0, b: 0, a: 0}
     key3: {r: 0, g: 0, b: 0, a: 0}
     key4: {r: 0, g: 0, b: 0, a: 0}
@@ -184,8 +185,8 @@ MonoBehaviour:
     m_NumAlphaKeys: 2
   gradientB:
     serializedVersion: 2
-    key0: {r: 0, g: 0, b: 1, a: 1}
-    key1: {r: 1, g: 1, b: 1, a: 1}
+    key0: {r: 0, g: 0, b: 1, a: 0.54901963}
+    key1: {r: 1, g: 1, b: 1, a: 0.627451}
     key2: {r: 1, g: 1, b: 0, a: 0}
     key3: {r: 0, g: 0, b: 0, a: 0}
     key4: {r: 0, g: 0, b: 0, a: 0}
@@ -211,6 +212,8 @@ MonoBehaviour:
     m_Mode: 0
     m_NumColorKeys: 3
     m_NumAlphaKeys: 2
+  leafColorA: {r: 0.45882356, g: 0.97647065, b: 0.29803923, a: 0.49803922}
+  leafColorB: {r: 0.21568629, g: 0.4901961, b: 0.13333334, a: 0.9019608}
 --- !u!4 &197491476
 Transform:
   m_ObjectHideFlags: 0

Assets/Script/Fractal.cs

@@ -53,12 +53,15 @@ public class Fractal : MonoBehaviour
 
     NativeArray<float3x4>[] matrices;
 
-    [SerializeField, Range(2, 8)]
+    [SerializeField, Range(3, 8)]
     int depth = 4;
 
     [SerializeField]
     Mesh mesh = default;
 
+    [SerializeField]
+    Mesh leafMesh = default;
+    
     [SerializeField]
     Material material = default;
 
@@ -68,6 +71,12 @@ public class Fractal : MonoBehaviour
     [SerializeField]
     Gradient gradientB = default;
 
+    [SerializeField]
+    Color leafColorA = default;
+
+    [SerializeField]
+    Color leafColorB = default;
+
     static float3[] directions =
     {
         up(), right(), left(), forward(), back()
@@ -112,7 +121,7 @@ public class Fractal : MonoBehaviour
             parts[i] = new NativeArray<FractalPart>(length, Allocator.Persistent);
             matrices[i] = new NativeArray<float3x4>(length, Allocator.Persistent);
             matricesBuffers[i] = new ComputeBuffer(length, stride);
-            sequenceNumbers[i] = new Vector4(Random.value, Random.value);
+            sequenceNumbers[i] = new Vector4(Random.value, Random.value, Random.value, Random.value);
         }
         
         parts[0][0] = CreatePart(0);
@@ -188,8 +197,25 @@ public class Fractal : MonoBehaviour
         jobHandle.Complete();
 
         var bounds = new Bounds(rootPart.worldPosition, float3(3f * objectScale));
+        int leafIndex = matricesBuffers.Length - 1;
         for (int i = 0; i < matricesBuffers.Length; i++)
         {
+            Mesh instanceMesh;
+            Color colorA, colorB;
+            if (i == leafIndex)
+            {
+                colorA = leafColorA;
+                colorB = leafColorB;
+                instanceMesh = leafMesh;
+            }
+            else
+            {
+                colorA = gradientA.Evaluate(i / (matricesBuffers.Length - 2f));
+                colorB = gradientB.Evaluate(i / (matricesBuffers.Length - 2f));
+                instanceMesh = mesh;
+            }
+            propertyBlock.SetColor(colorAId, colorA);
+            propertyBlock.SetColor(colorBId, colorB);
             ComputeBuffer buffer = matricesBuffers[i];
             buffer.SetData(matrices[i]);
             float gradientInterpolator = i / (matricesBuffers.Length - 1f);
@@ -197,7 +223,7 @@ public class Fractal : MonoBehaviour
             propertyBlock.SetColor(colorBId, gradientB.Evaluate(gradientInterpolator));
             propertyBlock.SetBuffer(matricesId, buffer);
             propertyBlock.SetVector(sequenceNumbersId, sequenceNumbers[i]);
-            Graphics.DrawMeshInstancedProcedural(mesh, 0, material, bounds, buffer.count, propertyBlock);
+            Graphics.DrawMeshInstancedProcedural(instanceMesh, 0, material, bounds, buffer.count, propertyBlock);
         }
     }
 }

Assets/Script/PartGPU.hlsl

@@ -4,14 +4,20 @@
 
 float4 _ColorA, _ColorB;
 
-float2 _SequenceNumbers;
+float4 _SequenceNumbers;
 
 float4 GetFractalColor () {
 	#if defined(UNITY_PROCEDURAL_INSTANCING_ENABLED)
-		return lerp(
-			_ColorA, _ColorB,
+		float4 color;
+		color.rgb = lerp(
+			_ColorA.rgb, _ColorB.rgb,
 			frac(unity_InstanceID * _SequenceNumbers.x + _SequenceNumbers.y)
 		);
+		color.a = lerp(
+			_ColorA.a, _ColorB.a,
+			frac(unity_InstanceID * _SequenceNumbers.z + _SequenceNumbers.w)
+		);
+		return color;
 	#else
 		return _ColorA;
 	#endif