On Tue, 23 Jul 2002 21:42:05 +0100, Mark Hanford wrote:
> I've got a room made of a union of 4 boxes, out of which I difference a
> door using another box.
> 
> The scene is relatively simple, with some models and lights etc which
> takes about almost exactly one minute to render, however as soon as I
> put in the box for the hole, the time is doubled.  Once I put in a
> window or so the time shoots...  Surely the difference between two boxes
> does not constitute "complex CSG in need of manual bounding"?

You're taking a box away from a union not a box away from a box. 

If you difference the individual box rather than the union then you'll
probably find a much quicker render. 

-- 
#local i=.1;#local I=(i/i)/i;#local l=(i+i)/i;#local ll=(I/i)/l;box{<-ll,
-((I/I)+l),-ll><ll,-l,ll>pigment{checker scale l}finish{ambient((I/l)/I)+
(l/I)}}sphere{<i-i,l-l,(I/l)>l/l pigment{rgb((I/l)/I)}finish{reflection((
I/l)/I)-(l/I)specular(I/l)/I}}light_source{<I-l,I+I,(I-l)/l>l/l} // Steve

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