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58 lines
2.7 KiB
58 lines
2.7 KiB
/* |
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This file is part of Magnum. |
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Copyright © 2010, 2011, 2012, 2013, 2014, 2015 |
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Vladimír Vondruš <mosra@centrum.cz> |
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Permission is hereby granted, free of charge, to any person obtaining a |
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copy of this software and associated documentation files (the "Software"), |
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to deal in the Software without restriction, including without limitation |
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the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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and/or sell copies of the Software, and to permit persons to whom the |
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Software is furnished to do so, subject to the following conditions: |
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The above copyright notice and this permission notice shall be included |
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in all copies or substantial portions of the Software. |
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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DEALINGS IN THE SOFTWARE. |
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*/ |
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#include "GenerateFlatNormals.h" |
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#include "Magnum/Math/Vector3.h" |
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#include "Magnum/MeshTools/Duplicate.h" |
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#include "Magnum/MeshTools/RemoveDuplicates.h" |
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namespace Magnum { namespace MeshTools { |
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std::tuple<std::vector<UnsignedInt>, std::vector<Vector3>> generateFlatNormals(const std::vector<UnsignedInt>& indices, const std::vector<Vector3>& positions) { |
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CORRADE_ASSERT(!(indices.size()%3), "MeshTools::generateFlatNormals(): index count is not divisible by 3!", (std::tuple<std::vector<UnsignedInt>, std::vector<Vector3>>())); |
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/* Create normal for every triangle (assuming counterclockwise winding) */ |
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std::vector<UnsignedInt> normalIndices; |
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normalIndices.reserve(indices.size()); |
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std::vector<Vector3> normals; |
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normals.reserve(indices.size()/3); |
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for(std::size_t i = 0; i != indices.size(); i += 3) { |
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const Vector3 normal = Math::cross(positions[indices[i+2]]-positions[indices[i+1]], |
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positions[indices[i]]-positions[indices[i+1]]).normalized(); |
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/* Use the same normal for all three vertices of the face */ |
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normalIndices.push_back(normals.size()); |
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normalIndices.push_back(normals.size()); |
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normalIndices.push_back(normals.size()); |
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normals.push_back(normal); |
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} |
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/* Remove duplicate normals and return */ |
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normalIndices = MeshTools::duplicate(normalIndices, MeshTools::removeDuplicates(normals)); |
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return std::make_tuple(std::move(normalIndices), std::move(normals)); |
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} |
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}}
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