VDB Reshape SDF Close

Dilate and Erode (Old)

Most people are probably familiar with the following workflow for sealing up gaps and holes in an SDF using 2 VDB Reshape SDF nodes:

1. Set the first one to Dilate
2. Set the second one to Erode
3. Channel reference the Offset parameter from the dilating node to the Offset parameter of the eroding node.
4. Adjust the offset until you’re happy

If you want to keep a filled interior, don’t forget to set the Trim parameter to None (Houdini 18.5+)!

Close (New)

Not sure when this was added (or maybe it has been here the whole time!), but there is another method that does the exact same thing in one go: Close.

Conclusion

A side-by-side comparison of the two looks like you get the same result!