CGAL users discussion list

[Aleksey Yakovlev <>]

What I can see right away is the absence of the "CGAL::CGAL" target in the link command. It should be like below:

target_link_libraries(${DFA_SIMPLE_OBJECT} PRIVATE CGAL::CGAL CGAL::CGAL_Basic_viewer)

Also it makes sense to check the Qt6 status after the "find_package":

if(CGAL_Qt6_FOUND)

....

On Fri, Mar 14, 2025 at 4:50 PM Theodore Omtzigt <> wrote:

Here is the CMakeLists.txt for that application:

find_package(CGAL COMPONENTS Qt6)
if(CGAL_FOUND)
    set(DFA_SIMPLE_OBJECT simple)
    include_directories(${CGAL_INCLUDE_DIRS})
    add_definitions(-DCGAL_USE_BASIC_VIEWER)
    add_executable(${DFA_SIMPLE_OBJECT} simple.cpp)
    target_include_directories(${DFA_SIMPLE_OBJECT} PUBLIC
        ${DFATOOLS_ROOT}/include
    )
    target_link_libraries(${DFA_SIMPLE_OBJECT} PRIVATE CGAL::CGAL_Basic_viewer)
    set_target_properties(${DFA_SIMPLE_OBJECT} PROPERTIES FOLDER "viz")

else()
    message(FATAL_ERROR "CGAL not found")
endif()

and the CMake build pulls  in the vcpkg toolchain file via a CMakePresets.json.

and cgal is installed via:

> vcpkg install cgal[qt]

 

On Fri, Mar 14, 2025 at 3:40 PM Aleksey Yakovlev <> wrote:

Hi, you need to provide more information about how you build your test - including all config files.

On Fri, Mar 14, 2025, 10:39 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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