This is an update on my efforts to make rembrandt work on not so new GPU.
I managed to make Rembrandt work on my NVidia 7600GT (on Debian Wheezy) with 
the following settings :

--enable-rembrandt
--prop:/sim/rendering/shadows/enabled=true
--prop:/sim/rendering/shadows/num-cascades=1
--prop:/sim/rendering/shadows/cascade-far-m=50
--prop:/sim/rendering/shadows/map-size=2048
--prop:/sim/rendering/shadows/filtering=2 (or 1 for no filtering)
--prop:/sim/rendering/use-color-for-depth=true

Last one is new and only work at startup.
There is only one cascade possible for the moment. Another value will lead to 
shader errors. The shadow map distance can be changed at runtime. 5 is best for 
cockpit view. 50 for outside view of the plane, 500 for the near terminals, or 
any other value you prefer. Filtering 2 is also available.

I realize that all these cryptic options are not user friendly to casual users, 
so I am open to suggestions for improving the friendliness of these settings.

Regards,
-Fred
http://wiki.flightgear.org/Project_Rembrandt


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