pls help: concave polygon boolean problem

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please see the attached houdini file.

Purpose:
use the cookie node to get just the part of the concave polygon that lies inside the box

Problem:
the result is weird because some parts of the concave sharp outside the box is not subtracted and some strange triangular connecting point 6, 15, 16 is also created from nowhere inside the box…

the convex polygon seems alright in these nodes…

should i do something to the concave polygon before connecting it to the boolean cookie node?

thanks!

Attachments:
concave boolean error.jpg (61.7 KB)
concave boolean error3.hipnc (45.0 KB)

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can anybody help me out on this problem?

Thank you!
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Put a Facet sop below your Polyextrude and turn on “Pre-Compute Normals”.
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Thank you very much for your advice, probbins!
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