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