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53 lines
1.9 KiB
53 lines
1.9 KiB
14 years ago
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/*
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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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using namespace Corrade::Utility;
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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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if(indices.size()%3 != 0) {
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Error() << "MeshTools::generateFlatNormals(): index count is not divisible by 3!";
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return tuple<vector<unsigned int>, vector<Vector3>>();
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}
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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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