Implement correct renderer

Assets/vfx-graph-gs/CrossProduct(Vector2).hlsl

@@ -1,10 +0,0 @@
-// Convert scaling vector to 4x4 transformation matrix
-// Scaling values are applied to X, Y, Z axes (sxyz.x, sxyz.y, sxyz.z)
-float CrossProduct(float2 u, float2 v) {
-    // Create diagonal scaling matrix
-    // s.x applied to X-axis
-    // s.y applied to Y-axis
-    // s.z applied to Z-axis
-    
-    return u.x * v.y - u.y * v.x;
-}

Assets/vfx-graph-gs/Main.unity

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@@ -716,5 +486,4 @@ SceneRoots:
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Assets/vfx-graph-gs/QuaternionToMatrix.hlsl

@@ -1,38 +0,0 @@
-// Convert quaternion to 4x4 transformation matrix
-// Quaternion is stored as (w, x, y, z) where w is the scalar part
-float4x4 QuaternionToMatrix(float4 q) {
-    // Extract quaternion components
-    float w = q.w;
-    float x = q.x;
-    float y = q.y;
-    float z = q.z;
-
-    // Calculate matrix elements
-    float m00 = 1.0 - 2.0 * (y * y + z * z);
-    float m01 = 2.0 * (x * y - z * w);
-    float m02 = 2.0 * (x * z + y * w);
-    float m03 = 0.0;
-
-    float m10 = 2.0 * (x * y + z * w);
-    float m11 = 1.0 - 2.0 * (x * x + z * z);
-    float m12 = 2.0 * (y * z - x * w);
-    float m13 = 0.0;
-
-    float m20 = 2.0 * (x * z - y * w);
-    float m21 = 2.0 * (y * z + x * w);
-    float m22 = 1.0 - 2.0 * (x * x + y * y);
-    float m23 = 0.0;
-
-    float m30 = 0.0;
-    float m31 = 0.0;
-    float m32 = 0.0;
-    float m33 = 1.0;
-
-    // Return matrix
-    return float4x4(
-        m00, m01, m02, m03,
-        m10, m11, m12, m13,
-        m20, m21, m22, m23,
-        m30, m31, m32, m33
-    );
-}

Assets/vfx-graph-gs/Scripts.meta

@@ -0,0 +1,8 @@
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+folderAsset: yes
+DefaultImporter:
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+  userData: 
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+  assetBundleVariant: 

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

@@ -221,17 +221,17 @@ namespace SplatVfx.Editor
                                 switch (property.name[6])
                                 {
                                     case '0':
-                                        splatData.ScaleArray[i].x = val;
+                                        splatData.ScaleArray[i].x = math.exp(val);
 
                                         break;
 
                                     case '1':
-                                        splatData.ScaleArray[i].y = val;
+                                        splatData.ScaleArray[i].y = math.exp(val);
 
                                         break;
 
                                     case '2':
-                                        splatData.ScaleArray[i].z = val;
+                                        splatData.ScaleArray[i].z = math.exp(val);
 
                                         break;
                                 }
@@ -242,22 +242,22 @@ namespace SplatVfx.Editor
                                 switch (property.name[4])
                                 {
                                     case '0':
-                                        splatData.RotationArray[i].x = val;
+                                        splatData.RotationArray[i].w = val;
 
                                         break;
 
                                     case '1':
-                                        splatData.RotationArray[i].y = val;
+                                        splatData.RotationArray[i].x = val;
 
                                         break;
 
                                     case '2':
-                                        splatData.RotationArray[i].z = val;
+                                        splatData.RotationArray[i].y = val;
 
                                         break;
 
                                     case '3':
-                                        splatData.RotationArray[i].w = val;
+                                        splatData.RotationArray[i].z = val;
 
                                         break;
                                 }

Assets/vfx-graph-gs/VFXGraphHLSL.meta

@@ -0,0 +1,8 @@
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Assets/vfx-graph-gs/VFXGraphHLSL/CalculateAxes.hlsl

@@ -0,0 +1,49 @@
+// Convert quaternion to 4x4 transformation matrix with non-uniform scaling
+float4x4 CalculateAxes(float4 q, float3 s) {
+    // Extract quaternion components
+    float w = q.w;
+    float x = q.x;
+    float y = q.y;
+    float z = q.z;
+
+    // Calculate rotated basis vectors (columns of the matrix)
+    // This represents the quaternion rotation applied to the unit axes
+    float rx = w * x - w * z + y * z + x * y;
+    float ry = w * y + x * z + w * z + x * y;
+    float rz = x * x - y * y - z * z + w * w;
+    
+    // More direct approach using the matrix formula
+    float m00 = 1.0 - 2.0 * (y * y + z * z);
+    float m01 = 2.0 * (x * y - z * w);
+    float m02 = 2.0 * (x * z + y * w);
+
+    float m10 = 2.0 * (x * y + z * w);
+    float m11 = 1.0 - 2.0 * (x * x + z * z);
+    float m12 = 2.0 * (y * z - x * w);
+
+    float m20 = 2.0 * (x * z - y * w);
+    float m21 = 2.0 * (y * z + x * w);
+    float m22 = 1.0 - 2.0 * (x * x + y * y);
+
+    // Apply scaling to each axis
+    // Each column of the matrix is the rotated axis scaled by the corresponding factor
+    float sx = s.x;
+    float sy = s.y;
+    float sz = s.z;
+
+    float m03 = 0.0;
+    float m13 = 0.0;
+    float m23 = 0.0;
+    float m30 = 0.0;
+    float m31 = 0.0;
+    float m32 = 0.0;
+    float m33 = 1.0;
+
+    // Return matrix with scaling
+    return float4x4(
+        m00 * sx, m01 * sy, m02 * sz, m03,
+        m10 * sx, m11 * sy, m12 * sz, m13,
+        m20 * sx, m21 * sy, m22 * sz, m23,
+        m30, m31, m32, m33
+    );
+}

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

@@ -0,0 +1,44 @@
+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);
+
+    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;
+}

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

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