Hi.

Is there any way to pass a poly selection up the stack into an HDA modifier?

Alternatively, is there a way we could pass a selection set in as a group?

I don't see anything in the docs about operating on partial objects in 3ds Max.

Thanks

There's currently no mechanism for either of those. The closest thing is passing in soft selections from 3ds Max to Houdini as a point attribute.

Please file RFEs for anything that you would like added to the plugin!

yeah, that is strange it is not implemented. i mean this is a serious show stopper. when will sidefx add it? i think in maya it is possible.

Yep Selection .hda via faces works cool in Maya . It should be implemented for 3dsmax either.
Also more options ( DCC callouts )in the DA tool itself should be available for Maya ( and 3smax too).