Scaling a volume breaks rendering when the camera orbits around the volume

Before solving #295, this issue did not exist. Now this is what happens when I scale my volume by a factor of 100. Pyvista has the very same problem.

When you click and hold the left mouse button, VTK switches to a low-fidelity rendering to go faster but it seems this part is not scaled and it’s far away close to the origin at a scale of 1 (that’s what I guess is happening).

Releasing left mouse button shows the volume correctly.

Another view of the same effect:

Code to reproduce this:

import nrrd
import numpy as np
import vedo

volume_data, header = nrrd.read('./annotation_100.nrrd')
vol = Volume(volume_data, mapper='smart').shade(False)
vol.cmap('viridis').alpha([0,1]).addScalarBar()
vol.scale([100, 100, 100])
vol.show(axes=1)

Associated volume data can be found in #295.

[nantille]

I can close this, thank you for your help!

[nantille]

Perfect if there’s no added computation and memory usage. Do you mean to say that alphaUnit should be also scaled to 100? Your guess was right, I used alphaUnit(100) and now the rendering looks like when the volume is not scaled (“spaced up”).