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71 lines
3.0 KiB
71 lines
3.0 KiB
/**************************************************************************** |
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* VCGLib o o * |
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* Visual and Computer Graphics Library o o * |
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* _ O _ * |
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* Copyright(C) 2004-2016 \/)\/ * |
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* Visual Computing Lab /\/| * |
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* ISTI - Italian National Research Council | * |
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* \ * |
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* All rights reserved. * |
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* * |
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* This program is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 2 of the License, or * |
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* (at your option) any later version. * |
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* * |
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* This program 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 General Public License (http://www.gnu.org/licenses/gpl.txt) * |
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* for more details. * |
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* * |
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****************************************************************************/ |
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#ifndef IO_FAN_TESSELLATOR_H |
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#define IO_FAN_TESSELLATOR_H |
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namespace vcg { |
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namespace tri { |
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namespace io { |
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/* |
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* A face polygon composed of more than three vertices is triangulated |
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* according to the following schema: |
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* v5 |
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* / \ |
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* / \ |
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* / \ |
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* v1------v4 |
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* |\ / |
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* | \ / |
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* | \ / |
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* v2---v3 |
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* |
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* As shown above, the 5 vertices polygon (v1,v2,v3,v4,v5) |
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* has been split into the triangles (v1,v2,v3), (v1,v3,v4) e (v1,v4,v5). |
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* This way vertex v1 becomes the common vertex of all newly generated |
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* triangles, and this may lead to the creation of very thin triangles. |
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* |
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* This function is intended as a trivial fallback when glutessellator is not available. |
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* it assumes just ONE outline |
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*/ |
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template < class PointType> |
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void FanTessellator(const std::vector< std::vector<PointType> > & outlines, std::vector<int> & indices) |
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{ |
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indices.clear(); |
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if(outlines.empty()) return; |
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const std::vector<PointType> &points=outlines[0]; |
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for(size_t i=0;i<points.size()-2;++i) |
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{ |
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indices.push_back(0); |
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indices.push_back(i+1); |
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indices.push_back(i+2); |
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} |
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} |
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} // end Namespace tri |
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} // end Namespace io |
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} // end Namespace vcg |
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#endif // IO_FAN_TESSELLATOR_H
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