OVERLAP without compositing?

[nano]

Hi,

I need to render overlapped object,
for ex. a sphere fading to an half one, can i do this?

I'm using the visibility control

It's a simple effect but it do not work (flickering)

I'm using GI, reflection and so....

I turned the secondary bias to 0.1....

I'd like to render it in one pass, without compositing, 'cause many object are interpenatring,

all the objects are coming from a step file, so I can't use the slice modifier.

ANY IDEAS?

[jacksc02]

you might be better off using an animated opacity map of some sort