Finding primitives on the opposite side of geometry

[noc2]

Hi;

I'm trying to get Houdini to detect primitives that lie on the opposite side of certain primitives. For this I'm using the intersect function, but I'm getting the feeling that this function only works with a secondary geometry, not within the same geometry itself  Prim no. 36 for example, returns itself, as it should look in the opposite direction of its normal and return the intersecting Prim. How can I get this done do you think?

Cheers;

AJ

Edited January 19, 2022 by noc2

[animatrix]

Hi,

You need to offset the hitpos using the opposite direction of the intersect normal, so it avoids the originating face.

[noc2]

Hi Yunus;

Thanx so much for the reply. I tried multiplying hitpos vector by a small number in the intersect function like you said, but still to avail  What am I doing wrong?

[noc2]

I tried offsetting the prim center by a small amount along the face normal and it worked  Thanx Yunus, for taking the time to help 

Cheers;

AJ