CGAL users discussion list

[Guillaume Damiand <>]

Many things are explained in the user and ref manual.
For example, you can define a functor allowing to control different drawing parameters (colors, wireframe, ...)

cf. here:

https://doc.cgal.org/latest/Basic_viewer/classGraphicsSceneOptionsWithVolumes.html

and the following example:

https://doc.cgal.org/latest/Basic_viewer/Basic_viewer_2draw_mesh_and_points_8cpp-example.html


You can draw some text in the basic viewer using the add_text method:

https://doc.cgal.org/latest/Basic_viewer/classCGAL_1_1Graphics__scene.html#a4dd4f8b899a3fd3b12c763dc7c10d438


Side remark: be careful with the answers of co-pilot ;)

Best regards
Guillaume



Le 26/06/2025 à 18:55, Pete Good ( via cgal-discuss Mailing List) a écrit :

I know that CGAL allows the user to control the colours of the faces of two-dimensional objects, such as polygons, but I need to control the colours of the faces of hexahedrons which are three-dimensional objects. I have been using <CGAL/Linear_cell_complex_for_combinatorial_map.h> and <CGAL/draw_linear_cell_complex.h> to create LCC objects, which I fill with multiple hexahedrons and then use CGAL::draw to display. The draw window displays all of the hexahedrons, which I can rotate as a group using the mouse.

The draw function randomly chooses the colour for each hexahedron but if the LCC contains a large number of hexahedrons then several hexahedrons have the same colour and I can't differentiate between them because there are no (x,y,z) labels on the display.

I don't know if there is any way of controlling the colours assigned to hexahedrons but there is a way of doing this I would be glad to know about it. If it can't be done then I would like to know if the CGAL developers are planning to introduce such functionality in the future. I also wonder if there is any plan to introduce (x,y,z) axes with numerical scales on them.

Regards

Pete Good

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Guillaume DAMIAND

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