[SHADERFX] Offsetmapping with ShaderFX wrong result if not at the center of the world

Saturn48

Hi guys, 

 

I am experimenting parallax mapping within shader FX ( using the offset mapping node ) on my eyeball shader to simulate iris refraction. I got pretty good result when my object is at the center of world but as soon as I am moving it away from the center I got the wrong result. ( the pupil offsets in the direction of the move ) 

I dug into the offset bump node as you can ungroup it.

It looks like the conversion from camera view vector to tangent space is the cause but I can be wrong.

Can someone point into the right direction ? What am I doing wrong ? 

Any idea ? 

Thank you 

poopipe

its a bit odd that there doesn't seem to be anything relating to object / camera positions in the bumpoffset node - I'd imagine you'd need to cancel them out.