Interesting effect with scaling

Assets/vfx-graph-gs/Main.unity

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Assets/vfx-graph-gs/MatMul.hlsl

@@ -0,0 +1,6 @@
+// Multiply two 4x4 matrices
+// Returns C = A * B
+float4x4 MatrixMultiply(float4x4 A, float4x4 B) {
+    // Matrix multiplication: C[i][j] = sum of A[i][k] * B[k][j]
+    return mul(A, B);
+}

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Assets/vfx-graph-gs/MatrixToAxes.hlsl

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+// Extract coordinate axes from transformation matrix
+// Returns the rotation part (3x3 upper-left submatrix)
+float3x3 MatrixToAxes(float4x4 t) {
+    // Extract the 3x3 rotation submatrix from the 4x4 transformation matrix
+    // Row 0 = X-axis direction (t[0].xyz)
+    // Row 1 = Y-axis direction (t[1].xyz)
+    // Row 2 = Z-axis direction (t[2].xyz)
+    
+    return float3x3(
+        t[0].xyz, // X-axis
+        t[1].xyz, // Y-axis
+        t[2].xyz  // Z-axis
+    );
+}

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Assets/vfx-graph-gs/QuaternionToMatrix.hlsl

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+// 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
+    );
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Assets/vfx-graph-gs/ScaleToMatrix.hlsl

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+// Convert scaling vector to 4x4 transformation matrix
+// Scaling values are applied to X, Y, Z axes (sxyz.x, sxyz.y, sxyz.z)
+float4x4 ScaleToMatrix(float3 s) {
+    // Create diagonal scaling matrix
+    // s.x applied to X-axis
+    // s.y applied to Y-axis
+    // s.z applied to Z-axis
+    
+    return float4x4(
+        s.x, 0.0,  0.0, 0.0,
+        0.0,  s.y, 0.0, 0.0,
+        0.0,  0.0,  s.z, 0.0,
+        0.0,  0.0,  0.0, 1.0
+    );
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