Sliced object and selection

[elpie89]

Hi, I'm trying to identify a proper way to detect the resulted part of a slice plane

a GIF is probably more understandable.

How can identify the split parts trough max script?

[denisT.MaxDoctor]

The answer looks obvious - it's the faces above and below the slice plane.

Check all triangle centers in the slice plane coordinate system. If z of the center's position is positive, the face is above; if it is negative, then the face is below.

[klvnk · Accepted solution]

if using editable poly IIRC polygons below have bit 17 set in face flags 

polyop.setFaceSelection $ (polyop.getFacesByFlag $ 65536)

should select all faces below a slice