VTK Backplot on RPi 4

persei8 wrote: The problem there is that the gcode_graphics widget uses opengl while the pi needs opengl es.

Did you try software rendering, i used it on a Pi3 and it improved things quite a bit.

Nope - because I have no clue how to do that.

wiki.linuxcnc.org/cgi-bin/wiki.pl?Troubl...oftware_based_OpenGL
Beware that it might break something.

Good suggestion but it looks like another dead end. It appears that libgl1-mesa-swx11 has been deleted from the repos or at least there is no installation candidate for buster. It's too bad because everything else works, just not the gcode_graphics. Until this is resolved, I don't see how anyone can use an rpi4 for linuxcnc.

Does Axis GUI work properly ?

Yes it does. Maybe because it's a software implementation of opengl instead of using a GPU?