[osg-submissions] possible usefull extension to osgShadow::ShadowMap

[Sebastian Messerschmidt]

Hi,

This patch includes two things:

1.) 	The polygon offset was hard-coded and I somehow had
	troubles overwritting this state deeper in my shadowed scenes.
	That's why I've added getter/setter methods for the polygon 			offset 
(saves trouble with nvidia and recent ati drivers ;-))

2.) 	Introduced 2 methods (setDone, setOneShot) to allow (re)sampling 
of the shadow map when desired. The oneshot-method can be 			thought as 
setting the shadow-sampling to a special mode, where 		the 'done' flag 
is actually taken into account. The done flag 			indicates if sampling 
has to be done for the current traversal. 		By resetting the 'done' one 
can force resampling of the map.
	(I use this since my scene and lights are static for a big 			number of 
frames but may change any time)

	I'm new to osg and I wonder if this could be done a little more
	intelligent ( I guess this should be done by changing the 			culling 
traverse strategy somehow ...)

Please give me some feedback on this. I have some more ideas/improvements.

P.S. I developed some kind of Unified Shader for per-pixel lighting with
optional shadowing that supports different lightsources ( effectively by 
using the glsl-preprocessor). Do you think that might be usefull to anyone?

cheers
Sebastian 'psy' Messerschmidt


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