Function main

examples/image_surface3d.cpp:52–140

Main procedure ----------------

// Main procedure
//----------------
int main(int argc,char **argv) {

  // Read command line arguments.
  cimg_usage("Render an image as a surface");
  const char *file_i    = cimg_option("-i",cimg_imagepath "logo.bmp","Input image");
  const char *file_o    = cimg_option("-o",(char*)0,"Output 3D object");
  const float sigma     = cimg_option("-smooth",1.0f,"Amount of image smoothing");
  const float ratioz    = cimg_option("-z",0.25f,"Aspect ratio along z-axis");
  const unsigned int di = cimg_option("-di",10,"Step for isophote skipping");

  // Load 2D image file.
  std::fprintf(stderr,"\n- Load file '%s'",cimg::basename(file_i)); std::fflush(stderr);
  const CImg<unsigned char>
    img  = CImg<>(file_i).blur(sigma).resize(-100,-100,1,3),
    norm = img.get_norm().normalize(0,255);

  // Compute surface with triangles.
  std::fprintf(stderr,"\n- Create image surface"); std::fflush(stderr);
  CImgList<unsigned int> primitives;
  CImgList<unsigned char> colors;
  const CImg<> points = img.get_elevation3d(primitives,colors,norm*-ratioz);

  // Compute image isophotes.
  std::fprintf(stderr,"\n- Compute image isophotes"); std::fflush(stderr);
  CImgList<unsigned int> isoprimitives;
  CImgList<unsigned char> isocolors;
  CImg<> isopoints;
  for (unsigned int i = 0; i<255; i+=di) {
    CImgList<> prims;
    const CImg<> pts = norm.get_isoline3d(prims,(float)i);
    isopoints.append_object3d(isoprimitives,pts,prims);
  }
  cimglist_for(isoprimitives,l) {
    const unsigned int i0 = isoprimitives(l,0);
    const float x0 = isopoints(i0,0), y0 = isopoints(i0,1);
    const unsigned char
      r = (unsigned char)img.linear_atXY(x0,y0,0),
      g = (unsigned char)img.linear_atXY(x0,y0,1),
      b = (unsigned char)img.linear_atXY(x0,y0,2);
    isocolors.insert(CImg<unsigned char>::vector(r,g,b));
  }
  cimg_forX(isopoints,ll) isopoints(ll,2) = -ratioz*norm.linear_atXY(isopoints(ll,0),isopoints(ll,1));

  // Save object if necessary
  if (file_o) {
    std::fprintf(stderr,"\n- Save 3d object as '%s'",cimg::basename(file_o)); std::fflush(stderr);
    points.save_off(primitives,colors,file_o);
  }

  // Enter event loop
  std::fprintf(stderr,
               "\n- Enter interactive loop.\n\n"
               "Reminder : \n"
               " + Use mouse to rotate and zoom object\n"
               " + key 'F'          : Toggle fullscreen\n"
               " + key 'Q' or 'ESC' : Quit\n"
               " + Any other key    : Change rendering type\n\n"); std::fflush(stderr);
  const char *const title = "Image viewed as a surface";