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55 lines
2.2 KiB
55 lines
2.2 KiB
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2016 Alec Jacobson <alecjacobson@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License
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// v. 2.0. If a copy of the MPL was not distributed with this file, You can
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// obtain one at http://mozilla.org/MPL/2.0/.
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#ifndef IGL_UNZIP_CORNERS_H
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#define IGL_UNZIP_CORNERS_H
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#include "igl_inline.h"
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#include <Eigen/Core>
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#include <vector>
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#include <functional>
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namespace igl
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{
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/// Given a triangle mesh where corners of each triangle index
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/// different matrices of attributes (e.g. read from an OBJ file), unzip the
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/// corners into unique efficiently: attributes become properly vertex valued
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/// (usually creating greater than #V but less than #F*3 vertices).
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///
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/// To pass a list of attributes this function takes an std::vector of
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/// std::reference_wrapper of an Eigen::... type. This allows you to use list
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/// initializers **without** incurring a copy, but means you'll need to
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/// provide the derived type of A as an explicit template parameter:
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///
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/// unzip_corners<Eigen::MatrixXi>({F,FTC,FN},U,G,J);
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///
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/// @param[in] A #A list of #F by 3 attribute indices, typically {F,FTC,FN}
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/// @param[out] U #U by #A list of indices into each attribute for each unique mesh
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/// vertex: U(v,a) is the attribute index of vertex v in attribute a.
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/// @param[out] G #F by 3 list of triangle indices into U
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/// @param[out] J #F*3 by 1 list of indices so that A[](i,j) = U.row(i+j*#F)
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///
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/// #### Matlibberish Example
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///
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/// [V,F,TC,FTC] = readOBJ('~/Downloads/kiwis/kiwi.obj');
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/// [U,G] = unzip_corners(cat(3,F,FTC));
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/// % display mesh
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/// tsurf(G,V(U(:,1),:));
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/// % display texture coordinates
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/// tsurf(G,TC(U(:,2),:));
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///
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template < typename DerivedA, typename DerivedU, typename DerivedG, typename DerivedJ>
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IGL_INLINE void unzip_corners(
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const std::vector<std::reference_wrapper<DerivedA> > & A,
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Eigen::PlainObjectBase<DerivedU> & U,
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Eigen::PlainObjectBase<DerivedG> & G,
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Eigen::PlainObjectBase<DerivedJ> & J);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "unzip_corners.cpp"
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#endif
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#endif
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