[Algorithms] vipm instancing

[Paul F. <pa...@ar...>]

> You can do it by having a list of faces per object (faces can't be shared).
> Each object will use the same vertex buffer and the same vsplit list, but
> each object is in a different state, with different VB_Len and
> CurrentVsplit.
> This needs memory but if you have a 64k polys object you only need 64K*2
> bytes per object, which isn't very much.

This is how I'm doing it currently, the trouble is that every instance uses
the same amount of memory which is a huge waste if I have many
instances at a high distance.

Its annoying because if this idea worked and you could have instances with
almost 0 memory waste you could have crazy numbers of polys in your
scene.

I thought of maybe using some kind of linked triangle list with the extra
tris being paged in, stuck in a different chunk of ram then linked to the
last chunk. Bad fragmentation and cache trouble I fear, though...

Cheers, Paul.