> pigment with rgbf or rgbt doesn't work here.

That's (almost) the best you can do. You might find that using merge{}
instead of union{} to hold the object together will make it look better (no
internal surfaces will be visible), and you can use an internal_texture to
make it so you only see the object on the way in and not the way out (so you
don't see the backside), but if there are two surfaces in front of each
other then you'll still be able to see them both. However...

> Additional: Is there a special command to show movement?

Mega-POV has a motion_blur feature that can be used for this. In addition,
motion blur can be used to make an entire object 50% transparent. Set the
object to do its motion for the first 50% of the clock time, and for the
rest, use an #if to scale the object really small and put it somewhere
off-screen. Then it will only be 50% visible, and as streaked as you want
it.

 - Slime
 [ http://www.slimeland.com/ ]

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