Bounding slabs = automatically generated bounding boxes.
The light buffer and vista buffer are explained in the docs, in the automatic
bounding control section. I've found that turning them off can sometimes improve
render speed (as well as saving memory) with large numbers of objects. I'm even
under th impression that they are turned off automatically for triangle meshes.
May be wrong though.
Manually bounding the trees will save memory, but at the expense of trace time
(unless you come up with a very clever manual bounding scheme).

Margus

TonyB wrote:
> 
> I need to know what a "bounding slab" is. I also need to know what a "light
> buffer" is. I want to know because they're making the parsing of a scene I'm
> working on *really* slow. They happen right at the end after having read in
> the POV file. I'm trying to make a forest with some Gilles Tran trees, and I
> have 5 different trees which I place in different ways. I have some with a
> recursion (is this the correct word?) of 3, and those go in the background,
> some with 4 that go in the foreground and some with 6 that go right in the
> front. When I put them all together the big slowdown happens. Individually
> and they all parse pretty quickly. I don't get it.
> 
> PS: Does anyone have pictures of Dagobah, or some similar planet to put my
> IRIDIA to explore on? The forest is my lame attempt at a Dagobah. It doesn't
> look like the real thing at all, as best I can recall. TIA.

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