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

[Sebastian Messerschmidt]

Hi Robert,

I will update and merge with the current SVN and then resubmit my changes.
cheers
Sebastian
> Hi Sebastian,
>
> Unforunately there has been a large number of changes to ShadowMap.cpp
> since you made your changes to it, so you new changes loose out many
> of these other changes.
>
> Could you please update to the SVN version of the OSG and apply you
> changes to this version and then submit this.
>
> Thanks,
> Robert.
>
> On Mon, Mar 3, 2008 at 8:51 AM, Sebastian Messerschmidt
> <Sebastian.Messerschmidt at gmx.de> wrote:
>   
>> 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 thing thak might be usefull to anyone?
>>
>>  cheers
>>  Sebastian 'psy' Messerschmidt
>>
>>
>>
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>>
>>     
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