Forcing rendering

Dear All,

I do the rendering of several volumes in same 3D image.
Some of them are over the others and shadow the previous rendered ones.
How I force re-render the previous ones (volumes) to appear the shadowed areas? (and to shadow the new ones areas instead)
I tried to do the following (to the previous ones). I added again the volume (the volumeMapper and volume was not reallocated but used the previous allocation)


But the new volumes remains over the old ones (previous ones) contrary to what I want.


Luís Gonçalves


And re-render the previous volume again.