Add multiblock to pyvista and pyvistaqt

[Gleb-GG]

Hi everyone and pyvista-team!

I have problems with add_mesh(multiblock). I wrote scripts with pyvista earlier and ,now, im creating gui with pyvistaqt. I set up multiblock of spheres and added in scene.

spheres = pv.MultiBlock([pv.Sphere()]) 
p = pv.Plotter(notebook=False)
p.add_mesh(spheres)

It took 9.841379165649414 seconds.

In pyvistaqt

self.plotter.add_mesh(self.Multiblock)

It took 59.311408042907715 seconds.

Why it happens? And how i can reduce time?

pv.Report()

            OS : Windows
        CPU(s) : 4
       Machine : AMD64
  Architecture : 64bit
           RAM : 10.2 GiB
   Environment : Python
    GPU Vendor : Intel
  GPU Renderer : Intel(R) UHD Graphics 620
   GPU Version : 4.5.0 - Build 27.20.100.8681

       pyvista : 0.31.3
           vtk : 9.1.0
         numpy : 1.21.6
       imageio : 2.17.0
       appdirs : 1.4.4
        scooby : 0.5.12
        meshio : 4.4.6
    matplotlib : 3.4.3
     pyvistaqt : 0.9.0
         PyQt5 : 5.15.4
       IPython : 7.23.1
      colorcet : 3.0.0
         scipy : 1.8.0
          tqdm : 4.64.0

---

[akaszynski]

This is being addressed in pyvista/pyvista#2941 and will be out in pyvista==0.37.0. If you're feeling brave, feel free to checkout feat/add_composite.

[Gleb-GG]

My bad, I didn't say that I use QtInteractor. This class haven't metod 'add_composite' as I see.

[akaszynski]

It inherits from the pyvista.Plotter class, so when 0.37.0 comes out you'll have it.

You can also get it right now by installing from source and using the above branch.

[Gleb-GG]

Thanks!! It's amazing, It takes 3.1086599826812744 seconds.

[akaszynski]

Awesome. I'm trying to get this out in the release soon. Glad it works, please let me know if you encounter any issues at all as it's a significant refactor.