I'm using PSSM Shadows in Ogre 1.6.4 and I have a scene which is around 100m square.
I also create a flat ground texture which does not cast shadows and extends off towards the horizon, but when I do this, and the Sun light source goes towards the horizon at dawn or dusk, then I get extra shadows at the edges of some of my objects. It's like some kind of self shadowing.
I'm using custom shaders, but the Ogre PlayPen PSSM shader also goes beserk in this environment too.
I've read that the world size can affect texture shadow mapping.
Is there a technique to allow this ground area to exist (ie my world to be big) without affecting my PSSM shadowing?
(btw - my derived light direction is correctly normalized!)