[vtk-developers] Some vtkMultiVolume questions/issues

[Elvis Stansvik]

Hi all,

I'm trying out the (very cool) vtkMultiVolume in VTK master.

Performance is noticeably slower if I render two volumes added to a
vtkMultiVolume, than if I render the same as separate volumes in the
"traditional" way. Is this to be expected? (note that in this
particular test, my two volumes were not intersecting, so the visual
result in the two scenarios was exactly the same).

I'll need to investigate more, but it seems that I can't set the
position of the first volume (the one set to port 0) using
SetPosition(..), it has no effect. Setting the position of subsequent
volumes (at higher port numbers) seems to work. I believe this was
possibly reported by another user on the users list.

Again I need to investigate more, but it seems
vtkRenderer::ResetCamera() did not quite work correctly when I had a
single vtkMultiVolume with a couple of volumes hooked up. It did not
center correctly on the two volumes.

Just wanted to ask if these were known issues, or if I should report
them? If I should report them I'll try to make minimal test cases.

Cheers,
Elvis