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-guid: cb5a5730510d4e149b46695b20885be2
-folderAsset: yes
-DefaultImporter:
-  externalObjects: {}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 

Assets/vfx-graph-gs/Scripts/Editor/SplatImporter.cs

@@ -319,11 +319,9 @@ namespace SplatVfx.Editor
                     color = 0.5f + color * SH_C0;
                     splatDataNative.color[elemIx] = color;
 
-                    for (int j = 0; j < 15; j++)
+                    for (int j = 0; j < 45; j++)
                     {
-                        splatDataNative.sh[elemIx * 45 + j * 3] = chunkBytes.ReinterpretLoad<float>(start + headerData.ElementByteOffsets[(int)DataEnum.f_rest_0 + j]);
+                        splatDataNative.sh[elemIx * 45 + j] = chunkBytes.ReinterpretLoad<float>(start + headerData.ElementByteOffsets[(int)DataEnum.f_rest_0 + j]);
-                        splatDataNative.sh[elemIx * 45 + j * 3 + 1] = chunkBytes.ReinterpretLoad<float>(start + headerData.ElementByteOffsets[(int)DataEnum.f_rest_0 + 15 + j]);
-                        splatDataNative.sh[elemIx * 45 + j * 3 + 2] = chunkBytes.ReinterpretLoad<float>(start + headerData.ElementByteOffsets[(int)DataEnum.f_rest_0 + 30 + j]);
                     }
 
                     float opacity = chunkBytes.ReinterpretLoad<float>(start + headerData.ElementByteOffsets[(int)DataEnum.opacity]);

Assets/vfx-graph-gs/VFX/Gaussian.shadergraph.meta

@@ -1,18 +0,0 @@
-fileFormatVersion: 2
-guid: f0801febb2a50a54ba1429eca4d4c0a1
-ScriptedImporter:
-  internalIDToNameTable: []
-  externalObjects: {}
-  serializedVersion: 2
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
-  script: {fileID: 11500000, guid: 625f186215c104763be7675aa2d941aa, type: 3}
-  useAsTemplate: 0
-  exposeTemplateAsShader: 0
-  template:
-    name: 
-    category: 
-    description: 
-    icon: {instanceID: 0}
-    thumbnail: {instanceID: 0}

Assets/vfx-graph-gs/VFX/GetMajorAxes.hlsl

@@ -1,54 +0,0 @@
-#define EPSILON 0.0004f
-
-float CrossProduct(float2 A, float2 B)
-{
-    return A.x * B.y - A.y * B.x;
-}
-
-float SweepArea(float2 A, float2 B)
-{
-    return abs(CrossProduct(A, B));
-}
-
-float4x4 GetMajorAxes(float4x4 Axes, float4x4 AxesProjections)
-{
-    float4x4 result = (float4x4)0;
-
-    float2 x_proj = AxesProjections[0].xy;
-    float2 y_proj = AxesProjections[1].xy;
-    float2 z_proj = AxesProjections[2].xy;
-
-    float3 x_axes = Axes[0].xyz;
-    float3 y_axes = Axes[1].xyz;
-    float3 z_axes = Axes[2].xyz;
-
-    float xy_area = SweepArea(x_proj, y_proj);
-    float xz_area = SweepArea(x_proj, z_proj);
-    float yz_area = SweepArea(y_proj, z_proj);
-
-    // Compute selection weights using step
-    float xy_is_max = step(xz_area, xy_area) * step(yz_area, xy_area);
-    float xz_is_max = step(yz_area, xz_area) * (1.0 - xy_is_max);
-    float yz_is_max = 1.0 - xy_is_max - xz_is_max;
-
-    // Select axis0
-    float3 axis0 = 
-        xy_is_max * x_axes +
-        xz_is_max * x_axes +
-        yz_is_max * y_axes;
-
-    // Select axis1
-    float3 axis1 = 
-        xy_is_max * y_axes +
-        xz_is_max * z_axes +
-        yz_is_max * z_axes;
-
-    // Normalize and scale if length is below threshold
-    float len0 = length(axis0);
-    float len1 = length(axis1);
-    
-    result[0].xyz = normalize(axis0) * max(len0, EPSILON);
-    result[1].xyz = normalize(axis1) * max(len1, EPSILON);
-
-    return result;
-}

Assets/vfx-graph-gs/VFXGraphHLSL/CalculateSH.hlsl

@@ -1,5 +1,3 @@
-#define sh(i) SHBuffer[Index * 45 + (i - 1)]
-
 /// Index: The splat's index
 /// Degrees: The degrees of spherical harmonics to calculate
 /// DirClr: A 4x4 matrix with the first row containing a vector from the splat position to the camera, and the second row containing its base color
@@ -29,49 +27,47 @@ float3 CalculateSHColor(uint Index, uint Degrees, float4x4 DirClr, StructuredBuf
 
 	float3 sh[16];
 
-	// INTERLEAVED RGB when loaded as StructuredBuffer<float>
 	// for (int i = 1; i < 16; i++)
 	// {
 	// 	sh[i].x = SHBuffer[Index * 45 + (i - 1) * 3];
 	// 	sh[i].y = SHBuffer[Index * 45 + (i - 1) * 3 + 1];
 	// 	sh[i].z = SHBuffer[Index * 45 + (i - 1) * 3 + 2];
 	// }
-	// CONTINUOUS CHANNELS when loaded as StructuredBuffer<float>
+	for (int i = 1; i < 16; i++)
-	// for (int i = 1; i < 16; i++)
+	{
-	// {
+		sh[i].x = SHBuffer[Index * 45 + (i - 1)];
-	// 	sh[i].x = SHBuffer[Index * 45 + (i - 1)];
+		sh[i].y = SHBuffer[Index * 45 + 15 + (i - 1)]; 
-	// 	sh[i].y = SHBuffer[Index * 45 + 15 + (i - 1)]; 
+		sh[i].z = SHBuffer[Index * 45 + 30 + (i - 1)];
-	// 	sh[i].z = SHBuffer[Index * 45 + 30 + (i - 1)];
+	}
-	// }
 
     if (Degrees > 0)
 	{
 		float x = dir.x;
 		float y = dir.y;
 		float z = dir.z;
-		result = result - SH_C1 * y * sh(1) + SH_C1 * z * sh(2) - SH_C1 * x * sh(3);
+		result = result - SH_C1 * y * sh[1] + SH_C1 * z * sh[2] - SH_C1 * x * sh[3];
 
 		if (Degrees > 1)
 		{
 			float xx = x * x, yy = y * y, zz = z * z;
 			float xy = x * y, yz = y * z, xz = x * z;
 			result = result +
-				SH_C2[0] * xy * sh(4) +
+				SH_C2[0] * xy * sh[4] +
-				SH_C2[1] * yz * sh(5) +
+				SH_C2[1] * yz * sh[5] +
-				SH_C2[2] * (2.0f * zz - xx - yy) * sh(6) +
+				SH_C2[2] * (2.0f * zz - xx - yy) * sh[6] +
-				SH_C2[3] * xz * sh(7) +
+				SH_C2[3] * xz * sh[7] +
-				SH_C2[4] * (xx - yy) * sh(8);
+				SH_C2[4] * (xx - yy) * sh[8];
 
 			if (Degrees > 2)
 			{
 				result = result +
-					SH_C3[0] * y * (3.0f * xx - yy) * sh(9) +
+					SH_C3[0] * y * (3.0f * xx - yy) * sh[9] +
-					SH_C3[1] * xy * z * sh(10) +
+					SH_C3[1] * xy * z * sh[10] +
-					SH_C3[2] * y * (4.0f * zz - xx - yy) * sh(11) +
+					SH_C3[2] * y * (4.0f * zz - xx - yy) * sh[11] +
-					SH_C3[3] * z * (2.0f * zz - 3.0f * xx - 3.0f * yy) * sh(12) +
+					SH_C3[3] * z * (2.0f * zz - 3.0f * xx - 3.0f * yy) * sh[12] +
-					SH_C3[4] * x * (4.0f * zz - xx - yy) * sh(13) +
+					SH_C3[4] * x * (4.0f * zz - xx - yy) * sh[13] +
-					SH_C3[5] * z * (xx - yy) * sh(14) +
+					SH_C3[5] * z * (xx - yy) * sh[14] +
-					SH_C3[6] * x * (xx - 3.0f * yy) * sh(15);
+					SH_C3[6] * x * (xx - 3.0f * yy) * sh[15];
 			}
 		}
 	}

Assets/vfx-graph-gs/VFXGraphHLSL/GetMajorAxes.hlsl

@@ -0,0 +1,46 @@
+/// Hidden
+float CrossProduct(float2 A, float2 B)
+{
+    return A.x * B.y - A.y * B.x;
+}
+
+/// Hidden
+float SweepArea(float2 A, float2 B)
+{
+    return abs(CrossProduct(A, B));
+}
+
+float4x4 GetMajorAxes(float4x4 Axes, float4x4 AxesProjections)
+{
+    float4x4 result = (float4x4)0;
+
+    float2 x_proj = AxesProjections[0].xy;
+    float2 y_proj = AxesProjections[1].xy;
+    float2 z_proj = AxesProjections[2].xy;
+
+    float3 x_axes = Axes[0].xyz;
+    float3 y_axes = Axes[1].xyz;
+    float3 z_axes = Axes[2].xyz;
+
+    float xy_area = SweepArea(x_proj, y_proj);
+    float xz_area = SweepArea(x_proj, z_proj);
+    float yz_area = SweepArea(y_proj, z_proj);
+
+    if (xy_area > xz_area && xy_area > yz_area)
+    {
+        result[0].xyz = x_axes;
+        result[1].xyz = y_axes;
+    }
+    else if (xz_area > yz_area)
+    {
+        result[0].xyz = x_axes;
+        result[1].xyz = z_axes;
+    }
+    else
+    {
+        result[0].xyz = y_axes;
+        result[1].xyz = z_axes;
+    }
+
+    return result;
+}

ProjectSettings/EditorBuildSettings.asset

@@ -6,7 +6,7 @@ EditorBuildSettings:
   serializedVersion: 2
   m_Scenes:
   - enabled: 1
-    path: Assets/vfx-graph-gs/Scenes/Main.unity
+    path: Assets/vfx-graph-gs/Main.unity
     guid: 09fad7c6f4d48844d9510f9903fca619
   m_configObjects:
     com.unity.input.settings.actions: {fileID: -944628639613478452, guid: 052faaac586de48259a63d0c4782560b, type: 3}

TODO.md

@@ -1,13 +1,8 @@
 # TODO
-- [ ] Account for the fact that a larger minor axis "hardens" splat edges
+
-    - Maybe shift the alpha gradient, or incorporate into shader
+- [ ] Rewrite SH Array to use interleaved RGB rather than contiguous data per 
-- [ ] Rework SplatBinder system to collect all splat objects in the scene and
+      channel
-      combine their buffers
+- [ ] Switch to using ByteAddressBuffers instead of loops in CalculateSH.hlsl
-- [ ] Write shader to calculate Gaussians at runtime
-    - Texture lookups are slow on mobile
-- [ ] ~~Write shader that prevents pixel overdraw~~
-    - ~~Applies cumulative alpha,while drawing back to front, and writes to the
-      Z-buffer after a certain threshold~~
 - [ ] Optimize CalculateAxes.hlsl
 - [ ] Allow splat data buffers to be accessible by other VFX Graphs
 - [ ] Support SOGS format
@@ -16,12 +11,3 @@
 - [ ] Add support for ASCII PLY data
 - [ ] Fix the header parsing logic in SplatImporter.cs
 - [ ] Add more thorough checks in SplatDataBinder.cs
-
-# DONE
-- [x] Rewrite SH Array to use interleaved RGB rather than contiguous data per 
-      channel
-- [x] Switch to using ByteAddressBuffers instead of loops in CalculateSH.hlsl
-    - Used StructuredBuffer\<float3\> instead
-
-# NOTES
-- Does VFX Graph calculate the Update and Render blocks before applying Z-test?

vfx-graph-gs.slnx

@@ -1,4 +1,3 @@
 <Solution>
   <Project Path="Assembly-CSharp.csproj" />
-  <Project Path="Assembly-CSharp-Editor.csproj" />
 </Solution>