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Interesting effect with scaling

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rsformoso
2026-03-11 22:11:54 +08:00
parent 701619ce90
commit cf63c5d062
10 changed files with 4662 additions and 2659 deletions
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Assets/vfx-graph-gs/Main.unity
+219 -8
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Assets/vfx-graph-gs/MatMul.hlsl
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// 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
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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;
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return float4x4(
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m10, m11, m12, m13,
m20, m21, m22, m23,
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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,
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Assets/vfx-graph-gs/SplatVFX.vfx
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