Re: [Algorithms] Stopping shadow volumes from going through geometry

[Gilles M. <gil...@fr...>]

MessageHi,

I think the ledge should also cast its shadow onto the ground, no ?
If so, it doesn't matter if the shadow volume is extruded past the =
ledge.
If fillrate is your bottleneck, think about clipping (cpu intensive), or =
try setting the far side=20
of the shadow volume nearer from the character.
If it's a sun-like light, radiosity of the environment should make look =
that=20
correct to your eyes.

Gilles.

----- Original Message -----=20
  From: Fong, Jay=20
  To: 'gda...@li...'=20
  Sent: Thursday, November 21, 2002 9:29 PM
  Subject: [Algorithms] Stopping shadow volumes from going through =
geometry


  Hello,

  I was wondering if there is some way to prevent shadows, generated by =
the stencil shadow volume technique, from being extruded through other =
objects in the scene?  e.g. a character standing on an overhanging ledge =
above ground casts a shadow on the ledge but also onto the ground below =
the ledge.

  I thought about clipping the extruded shadow polys against the world =
geometry but I'm hoping for a more elegant (i.e. simpler) solution since =
our world geometry is quite dense.

  Any solutions or links/pointers to papers related to this issue would =
be much appreciated!

  Thanks,
  Jay