This different chipset situation really makes you go insane. This shadow works ok at my ATI card though (Asus ATI x1650). But i also made a PSSM shader and it aint workin at NVidia chipsets. Since this demo works OK with NVidia i want to ask something. I am suspicous about the problems source is about render target at my PSSM shader. Did u use z_buffer or did u use bmaps to pass the depthmaps to shadow calculating shader???