yafray texture problems

i was animating a walking “J” (the begining of my name)

and i was using bumps (nor) from the procedual texture grass

and duing the animation, the texture seemed to move around the J when i wanted it to stay where it was

not a blender problem, using the internal renderer, the texture stayed in place

i don’t wanted bumps on my J moving around, any ideas?? i want to use yafray because it’s better then the internel render for speed when rendering reflections and stuff like that

please help