On 08/30/2015 07:38 PM, Alain wrote:
> Ouch!
> When you add a manual bounding to an union, that union is no longer 
> splitted. That cause it to take MUCH more time to render as each ray 
> that hit the manual bounding box now need to be tested against each and
 
> every components of the union. It's similar in effect to uselessly usin
g 
> merge instead of union.
> 
> Also, as your manual bounding box is larger than the original union, 
> it's even slower.
> 
    Have you tried it? ;) According to And, adding the manual bounding
box decreases the render time from 2m04s to 2s...

        Jerome
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