Hi there!

Inside Sop Modify, I scatter points and copy spheres on to them, but when I get back out, they do not show up even though the mesh appear in the scene graph. What am I missing and how do I fix it?

Thank you a lot in advance!

Not sure from your screen shot but maybe try sopcreate instead of sopmodify

One of the differences between SOP Create and SOP Modify (the one that matters here) is that SOP Modify has "Define Only Leaf Primitives" turned on by default. This means that the parent prim above the mesh prim (/sopmodify1) is an Over prim. This implicitly means all descendants are not "Defined" in the scene, and so hydra doesn't render them. Turn off "Define Only Leaf Primitives" and "/sopmodify1" will also become a "Def" prim instead of an "Over" prim, and the mesh will be recognized and rendered by hydra. See https://openusd.org/release/glossary.html#usdglossary-specifier [openusd.org] for more information.