Klara,
I have an idea but it's pretty rough - see what you can make of it.
Assume the MRI volume is highly refined - let's use this as the base mesh - I
think for this both the MRI and the circles have to be volume meshed, not just
surfaces.
Take your purple regions and assign a Point variable
Klara--
Have you tried to load both one.vtk and separate.vtk into a single
render window? ParaView is quite capable of doing this. If the
"reference file" separate.vtk image needs to be shifted, the transform
filter will let you re-position the image.
Hope this helps.
--Sam
On 11/3/2017
