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114 lines
5 KiB
C++
114 lines
5 KiB
C++
/*
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#
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# File : spherical_function3d.cpp
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# ( C++ source file )
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#
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# Description : An example that shows how to build custom 3D objects in CImg.
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# This file is a part of the CImg Library project.
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# ( http://cimg.eu )
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#
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# Copyright : David Tschumperlé
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# ( http://tschumperle.users.greyc.fr/ )
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#
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# License : CeCILL v2.0
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# ( http://www.cecill.info/licences/Licence_CeCILL_V2-en.html )
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#
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# This software is governed by the CeCILL license under French law and
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# abiding by the rules of distribution of free software. You can use,
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# modify and/ or redistribute the software under the terms of the CeCILL
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# license as circulated by CEA, CNRS and INRIA at the following URL
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# "http://www.cecill.info".
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#
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# As a counterpart to the access to the source code and rights to copy,
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# modify and redistribute granted by the license, users are provided only
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# with a limited warranty and the software's author, the holder of the
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# economic rights, and the successive licensors have only limited
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# liability.
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#
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# In this respect, the user's attention is drawn to the risks associated
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# with loading, using, modifying and/or developing or reproducing the
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# software by the user in light of its specific status of free software,
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# that may mean that it is complicated to manipulate, and that also
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# therefore means that it is reserved for developers and experienced
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# professionals having in-depth computer knowledge. Users are therefore
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# encouraged to load and test the software's suitability as regards their
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# requirements in conditions enabling the security of their systems and/or
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# data to be ensured and, more generally, to use and operate it in the
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# same conditions as regards security.
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#
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# The fact that you are presently reading this means that you have had
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# knowledge of the CeCILL license and that you accept its terms.
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#
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*/
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#include "CImg.h"
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using namespace cimg_library;
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/*---------------------------
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Main procedure
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--------------------------*/
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int main() {
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CImgList<unsigned char> object_colors;
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CImgList<float> object_opacities;
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// Define a 3D centered box.
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CImg<float> object_vertices = CImg<float>(3,8,1,1, // Define the 8 vertices of the cube
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-1,-1,-1, // (x0,y0,z0)
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1,-1,-1, // (x1,y1,z1)
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1,1,-1, // ...
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-1,1,-1,
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-1,-1,1,
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1,-1,1,
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1,1,1, // (x6,y6,z6)
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-1,1,1).transpose(); // (x7,y7,z7)
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CImgList<unsigned int> object_primitives(12,1,2,1,1, // Define the 12 segments of the cube
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0,1, 1,2, 2,3, 3,0,
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4,5, 5,6, 6,7, 7,4,
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0,4, 1,5, 2,6, 3,7);
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object_colors.insert(object_primitives.size(),CImg<unsigned char>::vector(32,64,255));
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object_opacities.insert(object_primitives.size(),CImg<float>::vector(0.3f));
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// Define the spherical function's vertices.
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CImgList<float> spherical_vertices;
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const float a = 1;
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const unsigned int na = 132, nb = 132;
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for (unsigned int v = 0; v<na; ++v)
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for (unsigned int u = 0; u<nb; ++u) {
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const float
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alpha = (float)(u*2*cimg::PI/nb),
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beta = (float)(-cimg::PI/2 + v*cimg::PI/na),
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x = (float)((a*std::cos(beta))*std::cos(alpha)),
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y = (float)((a*std::cos(beta))*std::sin(alpha)),
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z = (float)(a*std::sin(beta)),
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altitude = cimg::abs(1 + 0.8f*std::cos(3*alpha)*std::sin(4*beta));
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spherical_vertices.insert(CImg<float>::vector(altitude*x,altitude*y,altitude*z));
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}
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// Define the spherical function's mesh.
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CImgList<unsigned int> spherical_primitives;
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for (unsigned int vv = 0; vv<na - 1; ++vv)
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for (unsigned int uu = 0; uu<nb; ++uu) {
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const int nv = (vv + 1)%na, nu = (uu + 1)%nb;
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spherical_primitives.insert(CImg<unsigned int>::vector(nb*vv + nu,nb*nv + uu,nb*vv + uu));
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spherical_primitives.insert(CImg<unsigned int>::vector(nb*vv + nu,nb*nv + nu,nb*nv + uu));
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object_colors.insert(CImg<>::vector(0,255,255));
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object_colors.insert(CImg<>::vector(100,200,255));
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object_opacities.insert(2,CImg<>::vector(1));
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}
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// Merge 3D objects together.
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object_vertices.append_object3d(object_primitives,spherical_vertices>'x',spherical_primitives);
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char title[4096] = { 0 };
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std::sprintf(title,"3D Spherical Function (%u vertices, %u primitives)",
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object_vertices.width(),object_primitives.size());
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CImgDisplay disp(640,480,title,0);
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CImg<unsigned char>(disp.width(),disp.height(),1,3,220).
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display_object3d(disp,object_vertices,object_primitives,object_colors,object_opacities,true,4,3,false,
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500,0,0,-5000,0.1f,1.5f);
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return 0;
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}
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