How do I access the point weight attribute from geometry in a SHOP?

P is only a vector(3) and neither ‘Pw’, nor ‘weight’ or any other shorthand I can think of works.

if your float attribute is called weight
then creating Parameter VOP with parameter name weight and type float will automatically bind to that attribute and will completely ignore value from UI

Indeed, thanks, tamte. However, for reasons that are too complex to go into right now I'd like to use the built-in P attribute - the fourth component of position - in my SHOP, rather than a custom attribute. Do you know how to accomplish this?

Cheers,

AJB

Any devs care to chime in on this one?

No, because these forums are community supported.

My guess is that Pw is never available because geometry is diced before shading.

You can access Pw in a VOP SOP and copy it in a custom attribute to read in your shader.

digitallysane
You can access Pw in a VOP SOP and copy it in a custom attribute to read in your shader.

If you go with the approach of copying the Pw out, then just use an AttribCreate SOP and put in $WEIGHT for the Value.

Yep, that's what I ended up going with. Can't think why we're not able to access the built-in Pw attribute, but nevermind.