I got a little problem, playing with parameters didn't help:
May be I missed something, or my GeForce 6600 GT is old enough to handle this?? Plus, are there anyways to avoid increasing "clip_near" to get nice shadows? With "1" they are terrible..
That`s normal for PSSM shadows. You should tweak the variables in the shadows.c to get better shadows. Play with the shadow resolution (1024x1024 recommended), the pssm_splitweight (I use 0.0009). And design your level in a way that you don`t get graphical problems. Play with the sun angle, sun_elevation and so on.
1 split is not enough for pssm shadows. You should use more than 1 like 3, it is ideal. However, your shadow is not soft. You should also use nice filtering algorithms to soft edges.
My pssm is not different from gamestudio. I did not put any extra filter or something. Difference is coming from their view_to_split function. I wrote my own split function because there is shimmering effect on normal pssm. After i stop shimmering, i ended project because i can add improvements later but you can also look this one.