CGAL users discussion list

[Andrew Cunningham <>]

qt.qpa.plugin: Could not find the Qt platform plugin "windows" in ""
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

This discussion seems to have gone down a "rabbit-hole" of build issues unrelated to the real issue. This is simply a common QT runtime problem.  QT can't find its "plug-in" folder. Using environment variables to point to your QT installation solves the underlying problem. You will find many answers on google.

On Fri, Mar 14, 2025 at 6:39 AM Theodore Omtzigt <> wrote:

we are trying the CGAL Qt integration but when running the example from the CGAL documentation site:

#include <CGAL/Linear_cell_complex_for_combinatorial_map.h>
#include <CGAL/draw_linear_cell_complex.h>
 
using LCC=CGAL::Linear_cell_complex_for_combinatorial_map<3>;
using Point=LCC::Point;
 
int main()
{
  LCC lcc;
  lcc.make_hexahedron(Point(0,0,0), Point(5,0,0),
                      Point(5,5,0), Point(0,5,0),
                      Point(0,5,4), Point(0,0,4),
                      Point(5,0,4), Point(5,5,4));
  CGAL::draw(lcc);
 
  return EXIT_SUCCESS;
}

We get this error message:

qt.qpa.plugin: Could not find the Qt platform plugin "windows" in ""
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

What is the magic decoder ring that isn't mentioned in the CGAL documentation site to visualize CGAL data structures with Qt?

 

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