Boolean subtraction of two circle

thomthom

Would it not be better to just draw two arcs?
Instead of drawing geometry only to remove it again?

exvion

I don't know how calculate parameters of second arc.

thomthom

If the circles are both the same radius, then the second arc's angle would be 360 degrees - angle of first arc

So if the first arc is 260 degrees, the other would be 100 degrees.

...though, saying that... since Sketchup circles aren't true circles - the ends might not meet...

Jim

If you are ultimately adding faces to the circles, you can more easily track the created faces and delete the "other" one.

exvion

I created two arc


group = Sketchup.active_model.entities.add_group
vector2 = Geom;;Vector3d.new 0,0,1
group.entities.add_arc point0, vector2, vector, diametr/2, -150.degrees, 150.degrees
point0.z=point0.z-diametr*(3**0.5)*0.5
group.entities.add_arc point0, vector2, vector, diametr/2, -30.degrees, 30.degrees

How create face and push it? I try. What is wrong?


face=Sketchup.active_model.entities.add_face(group.entities)
face.pushpull distance,true

thomthom

You're getting errors?
A bit hard to guess what isn't working.

But if I where to guess: face=Sketchup.active_model.entities.add_face(group.entities)
Can you really create faces from entities located in a different context than the one you try to create in?

TIG

Thomthom Grumpy...
To be kinder... it should be:

face=group.entities.add_face(group.entities.to_a)

or even

face=group.entities[0].find_faces

exvion

Yes, this line is not correct, but I don't now how create face limited by two arc.
If I explode group, than I can generate face.

exvion

TIG, thank. It is work.

thomthom

@tig said:

Thomthom Grumpy...

I came across grumpy?

thomthom

Well it certainly wasn't my intention to come across as a drunk teacher. But I see what you mean. I was just sweeping by the forum and didn't look much into it. (which is why I didn't test the add_face method and instead asked questions)

Thanks for pointing that out to me though. Sense of mood are too easily lost in written communication - which makes wording more important.
(Mange takk. )

TIG

@thomthom said:

@tig said:

Thomthom Grumpy...

I came across grumpy?

The English phrase is you were 'terse' [avvisende]... or 'a little short' [litt kort]... just like your old school teacher might be when you ask a seemingly stupid question or you are doing something that is obviously not right [to him] AND he has a hangover etc etc