Chris Kinata nous apporta ses lumieres en ce 2005-09-28 14:26:
> Hi all,
> 
>
> two objects that results in an internal surface, would trace() stop at the
> internal surface? Using a 2D example, if you do a union of two overlapping circles,
> you get two arcs that are inside the combined object. Probably should just
> do the test rather than asking a general question...but would it be necessary
> to use merge rather than union?
> 
> --Chris
> 
> 
A merge only remove unneeded internal surfaces, and generaly increase the render time.
It's used to 
remove unwanted internal surfaces inside complex transparent objects. It's a variation
of an union, 
and is unsuited in the case of an intersection or difference. The trace function will
stop at the 
first surface it encounter, just like when you render an opaque object.

-- 
Alain
-------------------------------------------------
Beware of low-flying butterflies.

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