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I have written detailed investigation on forums: https://forums.thedarkmod.com/index.php?/topic/21803-matrix-conventions/ I copy the verdicts below. idRenderMatrix from Doom 3 BFG: row-major layout, indexed as A[row][column] transformed vector is column-vector on the right A then B composition is (B * A) idMat4, idMat2: row-major layout, indexed as A[row][column] transformed vector is column-vector on the right vector-matrix and matrix-vector multiplications yield same result A then B composition is (B * A) idMat3: column-major layout, indexed as A[column][row] vector-matrix and matrix-vector multiplications yield same result A then B composition is invoked like A * B in the C++ code In a sense, idMat3 just stores transposed matrix compared to idMat4... GLSL/OpenGL matrices: column-major layout, indexed as A[column][row] transformed vector is column-vector on the right vec * mat is same as transpose(mat) * vec A then B composition is (B * A) float[16] in Doom 3 renderer backend: column-major layout transformed vector is column-vector on the right A then B composition is myGlMultMatrix(A, B) |
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Added a bit more docs to the code: r10334 Added some comments regarding matrix conventions. And fixed the mess with idMat4 in backend: r10337 Fixed confusion of passing idMat4 to GLSL without transpose. |
- Anonymous
