Strange behavior of Union (&outer shell) Tool

[Qverburg]

Hi all,

I'm expierencing a problem with the union (and outer shell tool).
See my example file attached to this post.
When I union both objects some "holes" fill automaticly. It does this in all variations of my model where "the square holes" are not on the sides of the grid.

For a plugin im writing it's essential to do this unions correctly.

Is this a known bug and is there a work around?

Thanks in advance,

Quintus

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sample of my union error

[TIG]

The simpler 'outer-ring/fame' has been modeled inside out, with its backs all looking outwards.
I found that if I edited it, reversed one face and then used orient, then the 'union' of the two solids worked just fine - with the 'lattice' getting the wider outer 'frame'...
Have you tried that ?

[Qverburg]

@tig said:

The simpler 'outer-ring/fame' has been modeled inside out, with its backs all looking outwards.
I found that if I edited it, reversed one face and then used orient, then the 'union' of the two solids worked just fine - with the 'lattice' getting the wider outer 'frame'...
Have you tried that ?

Hey TIG Thanks for your quick respons!

Actualy i did reverse all faces of That group once to check. I used ctrl-a and reverse faces. I"ll check again when i get home.

Thanks

[Qverburg]

Just tried again but the 4 inner holes keep getting filled.
Im using windows7 and sk8pro 8.0.4811

[TIG]

Having repeated it a few times I find that it can occur with me too.
It's as if the four inner 'holes' don't always intersect with the rest and so in union are ignored and in shell are not penetrated, although with that you can intersect all with itself and erase the 8 unwnated faces to leave the holes...
How did you form the 'lattice' etc initially?
How about making the lattice with the thicker edges in one step?
You just need to do so math to adjust the setting out of the squares on a large extruded slab and then pushpull the set of square faces you've added by the slab's thickness to leaves the lattice's holes - then these boolean glitches are avoided

[Qverburg]

Hmm the thickning trick seems to work. Alltough it is quite a work around and hard to fix. In my script the inner lattice can be smaller than the outer ring. Thats why I create them seperately.

I attached a SKP where you can see the procedure and another "error" I get in certain union situations. Would be great if you can shine a light on it

[Qverburg]

@qverburg said:

Hmm the thickning trick seems to work. Alltough it is quite a work around and hard to fix. In my script the inner lattice can be smaller than the outer ring. Thats why I create them seperately.

I attached a SKP where you can see the procedure and another "error" I get in certain union situations. Would be great if you can shine a light on it

Classic, forgot the attachment!

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union error 2