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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2018 Blender Foundation. All rights reserved. */
/** \file
* \ingroup bke
*/
#pragma once
#include "BKE_multires.h"
#include "BLI_math_vector.h"
#include "BLI_utildefines.h"
BLI_INLINE void BKE_multires_construct_tangent_matrix(float tangent_matrix[3][3],
const float dPdu[3],
const float dPdv[3],
const int corner)
{
if (corner == 0) {
copy_v3_v3(tangent_matrix[0], dPdv);
copy_v3_v3(tangent_matrix[1], dPdu);
mul_v3_fl(tangent_matrix[0], -1.0f);
mul_v3_fl(tangent_matrix[1], -1.0f);
}
else if (corner == 1) {
copy_v3_v3(tangent_matrix[0], dPdu);
copy_v3_v3(tangent_matrix[1], dPdv);
mul_v3_fl(tangent_matrix[1], -1.0f);
}
else if (corner == 2) {
copy_v3_v3(tangent_matrix[0], dPdv);
copy_v3_v3(tangent_matrix[1], dPdu);
}
else if (corner == 3) {
copy_v3_v3(tangent_matrix[0], dPdu);
copy_v3_v3(tangent_matrix[1], dPdv);
mul_v3_fl(tangent_matrix[0], -1.0f);
}
else {
BLI_assert_msg(0, "Unhandled corner index");
}
cross_v3_v3v3(tangent_matrix[2], dPdu, dPdv);
normalize_v3(tangent_matrix[0]);
normalize_v3(tangent_matrix[1]);
normalize_v3(tangent_matrix[2]);
}
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