Fix: Enable Z-Write for Depth Occlusion & Fix Divide-by-Zero in Composite Shader

package/Runtime/GaussianSplatRenderer.cs

@@ -93,12 +93,12 @@ public bool GatherSplatsForCamera(Camera cam)
                 var orderA = a.Item1.m_RenderOrder;
                 var orderB = b.Item1.m_RenderOrder;
                 if (orderA != orderB)
-                    return orderB.CompareTo(orderA);
+                    return orderA.CompareTo(orderB);
                 var trA = a.Item1.transform;
                 var trB = b.Item1.transform;
                 var posA = camTr.InverseTransformPoint(trA.position);
                 var posB = camTr.InverseTransformPoint(trB.position);
-                return posA.z.CompareTo(posB.z);
+                return posB.z.CompareTo(posA.z);
             });
 
             return true;

package/Runtime/GpuSorting.cs

@@ -120,7 +120,7 @@ public GpuSorting(ComputeShader cs)
 
             cs.EnableKeyword(m_keyUintKeyword);
             cs.EnableKeyword(m_payloadUintKeyword);
-            cs.EnableKeyword(m_ascendKeyword);
+            cs.DisableKeyword(m_ascendKeyword);
             cs.EnableKeyword(m_sortPairKeyword);
             if (SystemInfo.graphicsDeviceType == UnityEngine.Rendering.GraphicsDeviceType.Vulkan)
                 cs.EnableKeyword(m_vulkanKeyword);

package/Shaders/GaussianComposite.shader

@@ -35,7 +35,10 @@ Texture2D _GaussianSplatRT;
 half4 frag (v2f i) : SV_Target
 {
     half4 col = _GaussianSplatRT.Load(int3(i.vertex.xy, 0));
-    return float4(GammaToLinearSpace(col.rgb/col.a),col.a);
+    if(col.a>0)
+        return float4(GammaToLinearSpace(col.rgb/col.a),col.a);
+    else
+        return float4(GammaToLinearSpace(col.rgb),col.a);
 }
 ENDCG
         }

package/Shaders/RenderGaussianSplats.shader

@@ -7,8 +7,8 @@ Shader "Gaussian Splatting/Render Splats"
 
         Pass
         {
-            ZWrite Off
-            Blend OneMinusDstAlpha One
+            ZWrite On
+            Blend One OneMinusSrcAlpha
             Cull Off
 
 CGPROGRAM