81 lines
2.8 KiB
C
81 lines
2.8 KiB
C
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// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2013 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_PER_VERTEX_NORMALS_H
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#define IGL_PER_VERTEX_NORMALS_H
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#include "igl_inline.h"
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#include <Eigen/Core>
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// Note: It would be nice to support more or all of the methods here:
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// "A comparison of algorithms for vertex normal computation"
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namespace igl
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{
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enum PerVertexNormalsWeightingType
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{
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// Incident face normals have uniform influence on vertex normal
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PER_VERTEX_NORMALS_WEIGHTING_TYPE_UNIFORM = 0,
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// Incident face normals are averaged weighted by area
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PER_VERTEX_NORMALS_WEIGHTING_TYPE_AREA = 1,
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// Incident face normals are averaged weighted by incident angle of vertex
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PER_VERTEX_NORMALS_WEIGHTING_TYPE_ANGLE = 2,
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// Area weights
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PER_VERTEX_NORMALS_WEIGHTING_TYPE_DEFAULT = 3,
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NUM_PER_VERTEX_NORMALS_WEIGHTING_TYPE = 4
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};
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// Compute vertex normals via vertex position list, face list
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// Inputs:
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// V #V by 3 eigen Matrix of mesh vertex 3D positions
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// F #F by 3 eigne Matrix of face (triangle) indices
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// weighting Weighting type
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// Output:
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// N #V by 3 eigen Matrix of mesh vertex 3D normals
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template <
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typename DerivedV,
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typename DerivedF,
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typename DerivedN>
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IGL_INLINE void per_vertex_normals(
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const Eigen::MatrixBase<DerivedV>& V,
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const Eigen::MatrixBase<DerivedF>& F,
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const igl::PerVertexNormalsWeightingType weighting,
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Eigen::PlainObjectBase<DerivedN> & N);
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// Without weighting
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template <
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typename DerivedV,
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typename DerivedF,
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typename DerivedN>
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IGL_INLINE void per_vertex_normals(
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const Eigen::MatrixBase<DerivedV>& V,
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const Eigen::MatrixBase<DerivedF>& F,
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Eigen::PlainObjectBase<DerivedN> & N);
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// Inputs:
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// FN #F by 3 matrix of face (triangle) normals
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template <typename DerivedV, typename DerivedF, typename DerivedFN, typename DerivedN>
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IGL_INLINE void per_vertex_normals(
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const Eigen::MatrixBase<DerivedV>& V,
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const Eigen::MatrixBase<DerivedF>& F,
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const PerVertexNormalsWeightingType weighting,
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const Eigen::MatrixBase<DerivedFN>& FN,
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Eigen::PlainObjectBase<DerivedN> & N);
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// Without weighting
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template <
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typename DerivedV,
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typename DerivedF,
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typename DerivedFN,
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typename DerivedN>
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IGL_INLINE void per_vertex_normals(
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const Eigen::MatrixBase<DerivedV>& V,
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const Eigen::MatrixBase<DerivedF>& F,
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const Eigen::MatrixBase<DerivedFN>& FN,
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Eigen::PlainObjectBase<DerivedN> & N);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "per_vertex_normals.cpp"
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#endif
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#endif
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