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64 lines
2.9 KiB
C++
64 lines
2.9 KiB
C++
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2016 Yotam Gingold <yotam@yotamgingold.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_SEAM_EDGES_H
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#define IGL_SEAM_EDGES_H
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#include "igl_inline.h"
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#include <Eigen/Core>
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namespace igl
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{
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// Finds all UV-space boundaries of a mesh.
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//
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// Inputs:
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// V #V by dim list of positions of the input mesh.
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// TC #TC by 2 list of 2D texture coordinates of the input mesh
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// F #F by 3 list of triange indices into V representing a
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// manifold-with-boundary triangle mesh
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// FTC #F by 3 list of indices into TC for each corner
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// Outputs:
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// seams Edges where the forwards and backwards directions have different
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// texture coordinates, as a #seams-by-4 matrix of indices. Each row is
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// organized as [ forward_face_index, forward_face_vertex_index,
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// backwards_face_index, backwards_face_vertex_index ] such that one side
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// of the seam is the edge:
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// F[ seams( i, 0 ), seams( i, 1 ) ], F[ seams( i, 0 ), (seams( i, 1 ) + 1) % 3 ]
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// and the other side is the edge:
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// F[ seams( i, 2 ), seams( i, 3 ) ], F[ seams( i, 2 ), (seams( i, 3 ) + 1) % 3 ]
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// boundaries Edges with only one incident triangle, as a #boundaries-by-2
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// matrix of indices. Each row is organized as
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// [ face_index, face_vertex_index ]
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// such that the edge is:
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// F[ boundaries( i, 0 ), boundaries( i, 1 ) ], F[ boundaries( i, 0 ), (boundaries( i, 1 ) + 1) % 3 ]
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// foldovers Edges where the two incident triangles fold over each other
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// in UV-space, as a #foldovers-by-4 matrix of indices.
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// Each row is organized as [ forward_face_index, forward_face_vertex_index,
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// backwards_face_index, backwards_face_vertex_index ]
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// such that one side of the foldover is the edge:
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// F[ foldovers( i, 0 ), foldovers( i, 1 ) ], F[ foldovers( i, 0 ), (foldovers( i, 1 ) + 1) % 3 ]
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// and the other side is the edge:
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// F[ foldovers( i, 2 ), foldovers( i, 3 ) ], F[ foldovers( i, 2 ), (foldovers( i, 3 ) + 1) % 3 ]
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template <
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typename DerivedV,
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typename DerivedTC,
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typename DerivedF,
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typename DerivedFTC,
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typename Derivedseams,
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typename Derivedboundaries,
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typename Derivedfoldovers>
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IGL_INLINE void seam_edges(
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const Eigen::PlainObjectBase<DerivedV>& V,
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const Eigen::PlainObjectBase<DerivedTC>& TC,
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const Eigen::PlainObjectBase<DerivedF>& F,
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const Eigen::PlainObjectBase<DerivedFTC>& FTC,
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Eigen::PlainObjectBase<Derivedseams>& seams,
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Eigen::PlainObjectBase<Derivedboundaries>& boundaries,
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Eigen::PlainObjectBase<Derivedfoldovers>& foldovers);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "seam_edges.cpp"
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#endif
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#endif
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