Re: [Algorithms] Doom lightmaps

[Jason Z. <zi...@op...>]

Several times during the presentation John Carmack say that the lighting
model is completely unified, every surface uses the same code.  Also one of
the scenes shows a creature coming towards the camera with a light is
rotating around the scene and all the shadows are correct.  That is the best
scene that shows off the lighting system, certainly makes me curious.

It is funny you mention the stencil+shadow map method because that is
exactly how I do dynamic shadows in my engine.  For any object that might
move or is extremely small(soda cans, etc) I use a stencil shadow and for
everything else I use pre-computed lightmaps.  They mesh together quite
well, better than I anticipated.

- Jason Zisk
- nFusion Interactive LLC

----- Original Message -----
From: "Daniel Vogel" <66...@gr...>
To: <gda...@li...>
Sent: Sunday, February 25, 2001 7:04 PM
Subject: RE: [Algorithms] Doom lightmaps


> If you look closely you will see that all shadows being cast by moving
> lights/ actors are sharp (stencil buffer shadows). The smooth shadows look
> like projected textures and you could easily do an effect like a rotating
> fan using an animated projective texture or even better using the texture
> matrix.
>
>
> - Daniel, Programmer, Epic Games Inc.
>
> > -----Original Message-----
> > From: gda...@li...
> > [mailto:gda...@li...]On Behalf
> > Of Jason Zisk
> > Sent: Sunday, February 25, 2001 6:47 PM
> > To: gda...@li...
> > Subject: Re: [Algorithms] Doom lightmaps
> >
> >
> > I don't see how you can draw a texture for objects/lights that are
moving
> > like in those movies?  As soon as the light moves the texture would
become
> > invalid (I'm assuming there is a texture per light thats mapped onto the
> > geometry).
> >
> > - Jason Zisk
> > - nFusion Interactive LLC
> >
> > ----- Original Message -----
> > From: "Corrinne Yu" <cor...@ho...>
> > To: <gda...@li...>
> > Sent: Sunday, February 25, 2001 4:47 PM
> > Subject: Re: [Algorithms] Doom lightmaps
> >
> > > -- Those are projective textures. How would I know? I know the man who
> > made
> > > the textures. And it is an artist, not a programmer. :)
> > >
> > >
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