Hi, it's possible with solaris and karma output pref aov?

Any primvar can be output as an image plane using a rendervar set to source "primvar"

i don't know what is the source name for the pref

i don't know how work in solaris/houdini i always use pref in maya with renderman or arnold and it was easy to do

Assuming I understand what you need correctly, you need to assign rest coordinates to the model(s), then make a Render Var that reads the rest primvar. In the attached example, I've added a rest attribute to Crag in /obj. The pref (position reference, for those not familiar with the term) AOV is created with a Render Var LOP, setting Source Type to primvar and Source Name to rest.

There may be a more efficient way to get it done; I'm barely fluent with Houdini, myself.

thanks i'll look into it