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48 lines
1.9 KiB
48 lines
1.9 KiB
/* |
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Copyright © 2010, 2011, 2012 Vladimír Vondruš <mosra@centrum.cz> |
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This file is part of Magnum. |
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Magnum is free software: you can redistribute it and/or modify |
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it under the terms of the GNU Lesser General Public License version 3 |
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only, as published by the Free Software Foundation. |
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Magnum is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU Lesser General Public License version 3 for more details. |
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*/ |
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#include "GenerateFlatNormals.h" |
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#include "MeshTools/Clean.h" |
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using namespace std; |
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namespace Magnum { namespace MeshTools { |
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tuple<vector<unsigned int>, vector<Vector3>> generateFlatNormals(const std::vector< unsigned int >& indices, const vector< Vector4 >& vertices) { |
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CORRADE_ASSERT(!(indices.size()%3), "MeshTools::generateFlatNormals(): index count is not divisible by 3!", (tuple<vector<unsigned int>, vector<Vector3>>())); |
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/* Create normal for every triangle (assuming counterclockwise winding) */ |
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vector<unsigned int> normalIndices; |
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normalIndices.reserve(indices.size()); |
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vector<Vector3> normals; |
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normals.reserve(indices.size()/3); |
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for(size_t i = 0; i != indices.size(); i += 3) { |
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Vector3 normal = Vector3::cross(vertices[indices[i+2]].xyz()-vertices[indices[i+1]].xyz(), |
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vertices[indices[i]].xyz()-vertices[indices[i+1]].xyz()).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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/* Clean duplicate normals and return */ |
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clean(normalIndices, normals); |
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return make_tuple(normalIndices, normals); |
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} |
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}}
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