Boolean union fail yet intersects by 0.5mm so why?

Rhino Rhino for Windows
1

Hi,
V5
need to boolean union this, it fails, have altered tolerance from 0.1 through to 0.000001 just to see if its that and still it fails.

Oh I do hate it when such happens.

Initially I had its base co planar, fail, so then added a block to uside, bound to work now, but no.

V5 note.
as V8 wouldnt rotate and behave and give yellow select and was too thick and …OMG.
.
got on like a house on fire, no messing with settings and fixing things.until this.
SR7 25x25mm basis SR5 rhinoV5 boolean fail.3dm (503.8 KB)

Steve

2

I get a closed polysurface.

image
image1211×1068 33.4 KB

3

Hi Steve -

Thanks. I’ve put this on the list as RH-88112 BooleanUnion: Rhino 9 Failure Case
-wim

4

Dear @Steve1
the wedge forms an angle of 0.286 and 0.859 degree.
The result of boolean union changes if you change the document unit angle tolerance.
(but will not result in what you re after).

another way to get an result:
_intersect
_trim (2x)
_join

kind regards - tom

5

Hi,
@wim
Note..This was Rhino 8 not 9 failure.

Tom,
will try for that instead.

so angle tolerance is also something to alter, though doesnt work here you say.

I wonder what is the idea of tolerance where all it does is cause us to have to alter it ! :laughing: :weary:
we all want things to just work.

Steve

7

are you sure you got the correct result ?
check those edges marked with (x) (x)

image
image1251×962 92.6 KB

I also tried _mergeallCoplanarFaces and _shrinktrimmeSrf … then boolean union and the result was bad in this area…there are ugly very small angles …