Surface broken after intersection

I am new to OpenStudio.
After modelling the geometry using Create Spaces From Diagram, executed Intersect in Selection. Then, I found some geometry got triangle surface in it which didn't have before.
Can anyone tell me what is causing this problem?
I will add before and after example below.
Before
image description
after
image description

katsuya.obara's avatar
2.1k
katsuya.obara
asked 2017-10-26 19:49:19 -0500
__AmirRoth__'s avatar
4.4k
__AmirRoth__
updated 2017-10-27 07:40:12 -0500
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Comments

that likely means it wasn't a planar surface; check your vertices to make sure this is a plane.

mdahlhausen's avatar mdahlhausen (2017-10-27 13:01:46 -0500) edit

Are there any convenience way to make sure this is plane?(command, measure etc)

katsuya.obara's avatar katsuya.obara (2017-10-30 20:10:34 -0500) edit

you can try tracing lines between the vertices and see if it forms a surface. If it can't, that means there is some point on the edge that is non planar. Other option is to check the coordinates in the .osm file in a text editor.

mdahlhausen's avatar mdahlhausen (2017-10-31 12:11:50 -0500) edit
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