52 lines
1.9 KiB
C
52 lines
1.9 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_FACE_NORMALS_H
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#define IGL_PER_FACE_NORMALS_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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// Compute face 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 eigen Matrix of face (triangle) indices
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// Z 3 vector normal given to faces with degenerate normal.
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// Output:
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// N #F by 3 eigen Matrix of mesh face (triangle) 3D normals
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//
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// Example:
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// // Give degenerate faces (1/3,1/3,1/3)^0.5
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// per_face_normals(V,F,Vector3d(1,1,1).normalized(),N);
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template <typename DerivedV, typename DerivedF, typename DerivedZ, typename DerivedN>
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IGL_INLINE void per_face_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<DerivedZ> & Z,
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Eigen::PlainObjectBase<DerivedN> & N);
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// Wrapper with Z = (0,0,0). Note that this means that row norms will be zero
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// (i.e. not 1) for degenerate normals.
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template <typename DerivedV, typename DerivedF, typename DerivedN>
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IGL_INLINE void per_face_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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// Special version where order of face indices is guaranteed not to effect
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// output.
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template <typename DerivedV, typename DerivedF, typename DerivedN>
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IGL_INLINE void per_face_normals_stable(
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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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}
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#ifndef IGL_STATIC_LIBRARY
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# include "per_face_normals.cpp"
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#endif
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#endif
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