Hello,

First, let me explain the project, so you'll have all the info, even if that might be superfluous.

To try the procedural modeling in Houdini, I've created a geometry that builds a pyramid out of any object I give in input with any number of rows I set.

That works well for the modeling itself and for my test, the object I duplicated into 7 rows is a transparent glass cube with a clay cube inside.
I rendered with PBR, a distant light and a caustic light with 1000000 points.
After rendering, I could see the light at the base of the pyramid is wrong … I attach a picture so you can see it too.

Do you see the bright lights at the base, specially on the left side? That's what I'm talking about.

Also, if you look closer under the pyramid, there are strange shadows, like the shadows of hollow squares ….

What can I do to fix all that? I tried moving the light but doesn't help much …