   Has anyone used the oDepth register in PS 2.0 (and up)?
  I''ve just been racking my brain trying to figure out a useful application for the oDepth register in PS 2.0 and up, and I was wondering if anyone had any demos (preferably screen caps, I''ve only got a GeForce4) of oDepth being used, or some applications of it. 
  I know I use it for some research apps I''m working on.  But I''m working on hardware ray tracing using pixel shaders.  I render a screen-aligned quad and use the pixel shader to test for intersection against the geometry.  If there''s an intersection, I write out the depth of that intersection to the oDepth register.I''m sure there are other applications that it could be used for as well.neneboricua 