There has been this SOP available on Houdini:
https://www.sidefx.com/docs/houdini/nodes/sop/tetrahedralize.html [www.sidefx.com]
Looks like it's replaced by this one:
https://www.sidefx.com/docs/houdini/nodes/sop/tetconform.html [www.sidefx.com]
I wonder why. What was the rationale behind this replacement?