Re: [Algorithms] Sorting polys

[Justin J. <ju...@mo...>]

I have written a similar shader system. Each shader can be potentially given
a sort number. A mesh (be it dynamic or scenery) has its parts designated to
a shader - there is no copying involved here. The renderer iterates through
the shaders and then for each shader iterates through the mesh chunks
rendering them. I repeat, there is no copying or sorting here. At startup,
each shader is inserted into the shader list in sort order.

I use D3D vertex buffers although I would imagine you can use OpenGL vertex
arrays just the same.

Ok, you can get artifacts with transparent polys but with a little cunning
(fiddling about with the sort orders) you can get rid of most of them. Q3
suffers from the same artifacts.

Bite the bullet. Handling transparent polys properly is a time consuming
pain.

Justin Johnson - Technical Director
Mobius Entertainment
ju...@mo...


----- Original Message -----
From: Ignacio Castano <i6...@ho...>
To: <gda...@li...>
Sent: Thursday, August 10, 2000 10:34 PM
Subject: RE: [Algorithms] Sorting polys


> Stefano 'Panda' Baraldi wrote:
> > Of course this has to be done on manually transformed vertex coords.
> > Anyone knows how commercial quality engines (Q3,UnrealT,...) handle
polygon
> > sorting for alpha blending?
> > Do they use underlying structures like bsp?
>
> As far as i know q3 uses qsort for dynamic objects, but there's no sorting
for bsp faces. Those
> polygons are only sorted at the beginning depending on their sort number
and material.
>
> Ignacio Castano
> ca...@cr...
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