Interactive show

[adam-urbanczyk]

Currently show is blocking, it would be great to be able to use it multiple times without blocking of the script execution. I see 3 options

1. Use Qt or Tk, requires integration of the gui event loop with the interpreter (Check how IPython odes that)
2. Run all the VTK stuff in a separate thread and periodically invoke vtkRenderWindowInteractor.ProcessEvents()
3. Trame (+pywebview - optional)

[adam-urbanczyk]

Regarding 3, it is easy to get something quickly:

Few observations:

• vtkAssembly does not seem to work with vtkLocalView (VTK.js)
• As-is I'm getting too much output in the console in Spyder

Output from spyder call 'get_state':
vtk-remote-view.size is missingvtk-remote-view.size is missingvtk-remote-view.shape is missingvtk-remote-view.shape is missingvtk-remote-view.shape is missingvtk-remote-view.shape is missingvtk-remote-view.size is missingvtk-remote-view.size is missingvtk-remote-view.size is missingvtk-remote-view.size is missingvtk-remote-view.shape is missingvtk-remote-view.shape is missingvtk-remote-view.shape is missingvtk-remote-view.shape is missingvtk-remote-view.size is missingvtk-remote-view.size is missing

[lorenzncode]

I had some interest in a VTK.js based viewer (maybe as a separate project not built-in to CadQuery). I suppose the viewer could be implemented in other frameworks so Trame is one option.

3. VTK.js single page application (browser and/or webview)
   a. Trame
   b. from scratch (bring your own framework)

[adam-urbanczyk]

FYI: with the current implementation VTK.js based rendering seems to be rather quirky, less so with remote rendering. With VTK 9.4 where is also a WASM option if I understand correctly, but for now we are on 9.3.

More visuals

With Remote

With local (vtk.js)