Note In order to run hcustom, you need to have the C-Shell (i.e. So if you open Houdini and create a Geometry object, you can dive into the geometry and press TAB->SOP Star and your Star surface operator will appear. This is where Houdini is able to locate and load your custom plugins. The library file is automatically installed into $HOME/houdiniX.Y/dso as well. Hcustom will produce a corresponding object file, SOP_Star.o, and a plugin library, SOP_Star.so, in the current working directory.