53 lines
1.9 KiB
C++
53 lines
1.9 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 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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#include "cylinder.h"
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#include "PI.h"
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#include <cassert>
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#include <cmath>
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template <typename DerivedV, typename DerivedF>
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IGL_INLINE void igl::cylinder(
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const int axis_devisions,
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const int height_devisions,
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Eigen::PlainObjectBase<DerivedV> & V,
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Eigen::PlainObjectBase<DerivedF> & F)
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{
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V.resize(axis_devisions*height_devisions,3);
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F.resize(2*(axis_devisions*(height_devisions-1)),3);
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int f = 0;
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typedef typename DerivedV::Scalar Scalar;
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for(int th = 0;th<axis_devisions;th++)
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{
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Scalar x = cos(2.*igl::PI*Scalar(th)/Scalar(axis_devisions));
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Scalar y = sin(2.*igl::PI*Scalar(th)/Scalar(axis_devisions));
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for(int h = 0;h<height_devisions;h++)
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{
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Scalar z = Scalar(h)/Scalar(height_devisions-1);
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V(th+h*axis_devisions,0) = x;
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V(th+h*axis_devisions,1) = y;
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V(th+h*axis_devisions,2) = z;
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if(h > 0)
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{
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F(f,0) = ((th+0)%axis_devisions)+(h-1)*axis_devisions;
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F(f,1) = ((th+1)%axis_devisions)+(h-1)*axis_devisions;
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F(f,2) = ((th+0)%axis_devisions)+(h+0)*axis_devisions;
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f++;
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F(f,0) = ((th+1)%axis_devisions)+(h-1)*axis_devisions;
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F(f,1) = ((th+1)%axis_devisions)+(h+0)*axis_devisions;
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F(f,2) = ((th+0)%axis_devisions)+(h+0)*axis_devisions;
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f++;
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}
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}
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}
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assert(f == F.rows());
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}
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#ifdef IGL_STATIC_LIBRARY
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template void igl::cylinder<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1> >(int, int, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> >&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> >&);
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#endif
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