73fd422701
* Use `float3x3` and `float3` for the resulting tangent matrix and constituent derivatives, respectively. Pull Request: https://projects.blender.org/blender/blender/pulls/140442
46 lines
1.4 KiB
C++
46 lines
1.4 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_matrix_types.hh"
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#include "BLI_math_vector.hh"
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#include "BLI_math_vector_types.hh"
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BLI_INLINE void BKE_multires_construct_tangent_matrix(blender::float3x3 &tangent_matrix,
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const blender::float3 &dPdu,
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const blender::float3 &dPdv,
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const int corner)
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{
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if (corner == 0) {
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tangent_matrix.x_axis() = dPdv * -1.0f;
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tangent_matrix.y_axis() = dPdu * -1.0f;
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}
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else if (corner == 1) {
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tangent_matrix.x_axis() = dPdu;
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tangent_matrix.y_axis() = dPdv * -1.0f;
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}
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else if (corner == 2) {
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tangent_matrix.x_axis() = dPdv;
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tangent_matrix.y_axis() = dPdu;
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}
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else if (corner == 3) {
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tangent_matrix.x_axis() = dPdu * -1.0f;
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tangent_matrix.y_axis() = dPdv;
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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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tangent_matrix.z_axis() = blender::math::cross(dPdu, dPdv);
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tangent_matrix.x_axis() = blender::math::normalize(tangent_matrix.x_axis());
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tangent_matrix.y_axis() = blender::math::normalize(tangent_matrix.y_axis());
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tangent_matrix.z_axis() = blender::math::normalize(tangent_matrix.z_axis());
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}
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