Re: [Algorithms] BSP tree, or what?

[Megan F. <sha...@gm...>]

While this is true, do keep in mind that occluder fusion isn't
necessarily going to win you anything you actually want.  Consider the
case where a collection of trees, viewed just so, occludes 80% of the
scene, netting you a significant performance boost.  This is a bad
thing, not a good thing - because players respond better to a
consistently mediocre framerate than they do to a framerate that
spikes massively and inconsistently.

I'm all for occlusion where it makes sense (big city buildings, big
houses, large walls), but most of the places where occluders make
sense are probably also places where individual objects are big enough
to just be modelled with occluders built in - no need for fusion.  The
usual example of "and we can take this group of people / cars and
occlude everything behind it!" tends to be a plain bad idea, unless
you're in the unlikely situation of having a game in which you're
absolutely always surrounded by a mass of (something indistinct).

> All of those mechanisms can be improved, from a rasterization point of
> view, by adding dynamic occluders (ideally with occluder fusion). I know
> that the IHVs say that their cards are efficient enough that you
> shouldn't bother, but that's only true for the "GTX" versions -- the
> 64-bit versions that end up in the laptops that most of the buying
> public are buying, are still very fill rate sensitive.
>
> Sincerely,
>
> jw
>
>
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-- 
Megan Fox
Idyllon, LLC
http://www.shalinor.com/
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