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Forgot do divide with the determinant

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Anonymous Maarten 2025-05-27 22:29:44 +02:00
parent fb751d9dfe
commit a8791ff571
1 changed files with 2 additions and 1 deletions
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3
miniwin/sdl3gpu/src/miniwin_d3drmviewport.cpp
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@ -60,9 +60,10 @@ static D3DVALUE Cofactor3x3(const D3DRMMATRIX4D m, int i, int j)
static void D3DRMMatrixInvertForNormal(D3DRMMATRIX3D out, const D3DRMMATRIX4D m)
{
assert(m[3][3] == 1.f);
float detM = m[0][0] * Cofactor3x3(m, 0, 0) - m[0][1] * Cofactor3x3(m, 0, 1) + m[0][2] * Cofactor3x3(m, 0, 2);
for (int i = 0; i < 3; ++i) {
for (int j = 0; j < 3; ++j) {
out[i][j] = (((i + j) % 2) ? -1 : 1) * Cofactor3x3(m, i, j);
out[i][j] = (((i + j) % 2) ? -1 : 1) * Cofactor3x3(m, i, j) / detM;
}
}
}