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103 lines
3.6 KiB
103 lines
3.6 KiB
15 years ago
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#ifndef Magnum_MeshTools_Subdivide_h
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#define Magnum_MeshTools_Subdivide_h
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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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/** @file
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* @brief Class Magnum::MeshTools::Subdivide
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*/
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#include "AbstractTool.h"
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namespace Magnum { namespace MeshTools {
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/**
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@brief %Mesh subdivisor implementation
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See subdivide() for full documentation.
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*/
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template<class Vertex, class Interpolator> class Subdivide: public AbstractTool<Vertex> {
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public:
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/** @copydoc AbstractTool::AbstractTool() */
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inline Subdivide(MeshBuilder<Vertex>& builder): AbstractTool<Vertex>(builder) {}
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/**
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* @brief Functor
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*
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* See subdivide() for full documentation.
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*/
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void run(Interpolator interpolator) {
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size_t indexCount = this->indices.size();
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this->indices.reserve(this->indices.size()*4);
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/* Subdivide each face to four new */
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for(size_t i = 0; i != indexCount; i += 3) {
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/* Interpolate each side */
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unsigned int newVertices[3];
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for(int j = 0; j != 3; ++j)
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newVertices[j] = this->builder.addVertex(interpolator(this->vertices[this->indices[i+j]], this->vertices[this->indices[i+(j+1)%3]]));
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/*
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* Add three new faces (0, 1, 3) and update original (2)
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*
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* orig 0
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* / \
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* / 0 \
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* / \
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* new 0 ----- new 2
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* / \ / \
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* / 1 \ 2 / 3 \
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* / \ / \
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* orig 1 ----- new 1 ---- orig 2
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*/
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this->builder.addFace(this->indices[i], newVertices[0], newVertices[2]);
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this->builder.addFace(newVertices[0], this->indices[i+1], newVertices[1]);
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this->builder.addFace(newVertices[2], newVertices[1], this->indices[i+2]);
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for(size_t j = 0; j != 3; ++j)
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this->indices[i+j] = newVertices[j];
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}
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}
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};
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/**
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@brief %Subdivide the mesh
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@tparam Vertex Vertex data type (the same as in MeshBuilder)
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@tparam Interpolator See @c interpolator function parameter
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@param builder %Mesh builder to operate on
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@param interpolator Functor or function pointer which interpolates
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two adjacent vertices: <tt>Vertex interpolator(Vertex a, Vertex b)</tt>
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Goes through all triangle faces and subdivides them into four new. Cleaning
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duplicate vertices in the mesh is up to user.
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This is convenience function supplementing direct usage of Subdivide class,
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instead of
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@code
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MeshBuilder<T> builder;
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MeshTools::Subdivide<T, Interpolator>(builder).run(interpolator);
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@endcode
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you can just write
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@code
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MeshTools::subdivide(builder, interpolator);
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@endcode
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*/
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template<class Vertex, class Interpolator> inline void subdivide(MeshBuilder<Vertex>& builder, Interpolator interpolator) {
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Subdivide<Vertex, Interpolator>(builder).run(interpolator);
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}
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}}
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#endif
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