Re: [Algorithms] Priority/ID shadowbuffer sorting.

[Tom F. <tom...@bl...>]

Using sorted IDs means that you don't get self-shadowing around the edges of
objects because of different rasterisation rules. The texels read will have
the ID of an object further away, i.e. a bigger IDs, and since I'm using a
>= test, they will still be lit.

There are ways to avoid this such as percentage-nearest filtering, but I
need this to work on stuff like the PS2, so that's not an option.

TomF - Muckyfoot bloke.


----- Original Message -----
From: Jon Watte <hp...@mi...>
To: <gda...@li...>
Sent: Sunday, February 09, 2003 5:07 PM
Subject: RE: [Algorithms] Priority/ID shadowbuffer sorting.


>
> > Only one teeny problem - it all relies on sorting object IDs from back
to
> > front, i.e. sorting objects.
>
> Why? You could shadow if the ID of the pixel you rasterize is different
> than the ID as found in the shadow map for the same pixel (when projected
> into shadow map/light space). Note: different, not "greater than".
>
> Or is there some other trick to your implementation which makes it need
> to sort, rather than just test?
>
> Cheers,
>
> / h+