RE: [Algorithms] Soft Shadows [was: silent hill 3 character rendering]

[Matthew M. <ma...@mi...>]

The most interesting recent work I've seen on real-time soft-shadows is
the penumbra wedge technique. This is very thoroughly written up in a
new PhD thesis out of Chalmers.

Here's a site that includes a link to that thesis, full source code,
etc.

NOTE: Some of the writings refer to a lower frame rate than I'm sure any
of us are looking for. Don't be put off! The technique evolved to get
50+ fps on (IIRC) not-that-cutting-edge hardware.

These shadows look really good and the penumbra is tied to the area of
the light source - extremely cool.

http://www.ce.chalmers.se/staff/tomasm/soft/


-----Original Message-----
From: gda...@li...
[mailto:gda...@li...] On Behalf Of Jon
Watte
Sent: Sunday, December 21, 2003 3:10 PM
To: gda...@li...
Subject: RE: [Algorithms] Soft Shadows [was: silent hill 3 character
rendering]


> Max Payne 2 uses projective shadows, renders caster in two (hi-res and
> low-res) textures and blends between them.

If you use shadow maps and have modern shaders, I suppose you could also
measure the distance between the shadowing surface and the point getting
shadowed, and bias the shadow map filtering based on this distance (with
the
assumption that further from occluder means more soft). Unfortunately,
this
chews fragment operations like there's no tomorrow, unless you get LOD
bias
on hardware percent-closer filtering, which isn't ubiquitous just yet
:-(

Cheers,

			/ h+



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