Monsoon,
arggghh! yes I get same problems, or if you DUPLICATE a sphere with one, both spheres disappear from render! :cursing:

had similar problems with Bryce, years ago. Sigh.
Wish I had shown them who's boss, mate!  :laugh:

Using "volume shaded" works, but often need to tweak the material per object, each object...

best way so far, seems to be applying them to a symetrical terrain.

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