Hi

i guess the answer for my question is quite simple, but i have'nt found any.
I've selected a piece of geometry using a bounding box, now i want to select some points inside the Group using a Expression.

… one way to do it is creating a new selection using the Expression and doing a logical Intersection “And”.

but this seems to me quite slow since its checking all Points against the Expression and then doing a “&&” with my boundingbox selection

Is there a way to tell Houdini that he only have to check the Expression inside the selected points ??

thx
Sebastian

did you try creating two groups, one with the bbox, one with your expression, and then intersecting them using the combine tab? maybe this is faster

if speed is critical you can also do this with a vop sop

Infernalspawn
Hi

i guess the answer for my question is quite simple, but i have'nt found any.
I've selected a piece of geometry using a bounding box, now i want to select some points inside the Group using a Expression.

… one way to do it is creating a new selection using the Expression and doing a logical Intersection “And”.

but this seems to me quite slow since its checking all Points against the Expression and then doing a “&&” with my boundingbox selection

Is there a way to tell Houdini that he only have to check the Expression inside the selected points ??

thx
Sebastian

The problem is that the SOPS by default process all points unless you specify just a group to act on. The group SOP does not, iirc, have a group specifier field at the very top of the parameters dialog. Thus, it is going to evaluate each point for each condition, one of which happens to be an expression, whose bounds are unknown until tested.
– Antoine