Entities.intersect_with crash

kwalkerman

Hi - I'm having trouble with "entities.intersect_with"

The code I'm using is:

g.entities.intersect_with(false,g.transformation,g.entities,g.transformation,false,g.entities.to_a)

where g is a group inside the Sketchup.active_model.entities collection.

Most of the time my code progresses without issues, but sometimes it crashes and I can't figure out why.

I can stop my code before this line and then manually intersect by selecting faces - without crashing SU. I have noticed that in cases where Sketchup crashes, when I manually intersect I end up with hidden lines on the intersected faces - as if the face is not planar. However, I can erase these lines without erasing the face.

Any ideas?

Thanks.

--
Karen

sdmitch

You appear to be trying to intersect a group with itself.

Dan Rathbun

@kwalkerman said:

..., but sometimes it crashes and I can't figure out why.

Well wrap it a begin .. rescue .. end block

... actually add an undo operation to that block, with an abort_operation() inside the rescue clause.

Save any Exception info to a logfile, from the rescue block.

rescue Exception => e
  File.open('whoops.txt','w+') { puts e.inspect; puts e.backtrace; }
  Sketchup.active_model.abort_operation()
  UI.messagebox("Intersect Error! Check 'whoops.txt' log.")
end

Otherwise, it seems weird that your code sample is intersecting the group's entities with itself.

kwalkerman

Yes, I am intersecting the groups entities with itself - this is so that I get lines at any location where two faces intersect.

Regarding the crash - I don't think I was clear. Ruby doesn't crash - Sketchup crashes, so I don't think a begin... rescue block would help.

Is there any other way to intersect faces in a collection?

Dan Rathbun

@kwalkerman said:

... Ruby doesn't crash - Sketchup crashes, so I don't think a begin... rescue block would help.

Well, It can't hurt. And it is best practice.

The undo operation, combined with the begin... rescue block, is designed to help protect the model from corruption.

And ya' never know, it might just log a StackOverflow or some error just before SketchUp poops out.

sdmitch

Changing the g.entities.to_a at the end of the code statement to just g worked for me without a bug splat

g.entities.intersect_with(false,g.transformation,g.entities,g.transformation,false,g)

kwalkerman

sdmitch - this works! No more bugsplats for now!

Thanks,

--
karen

thomthom

@sdmitch said:

Changing the g.entities.to_a at the end of the code statement to just g worked for me without a bug splat

g.entities.intersect_with(false,g.transformation,g.entities,g.transformation,false,g)

?? The API docs really need to expand with more info on this method!

Dan Rathbun

.. well, a group IS considered a single entity.

kwalkerman

@unknownuser said:

?? The API docs really need to expand with more info on this method!

yeah - most confusing method in the API!