fun with occt 7.3 defeaturing

tanderson69 · Post by **tanderson69** » Tue Jun 05, 2018 6:17 pm

A new operation was introduced in occt 7.3 called defeaturing. It works by removing faces from a solid and then trying to close the hole by extending the faces that remain. I took some time and ran some basic tests. Referencing the picture below: The left picture shows the input solid and the white faces to remove. The right picture shows the result of the defeaturing operation. Everything worked great with the exception of test 3. Which is surprising, as test 3 is a simpler case of test 7, which worked. I tried modeling test 3 a couple different ways, but could not get it to work. Anyway it is a great addition to occt modeling.

: results.png (190.31 KiB) Viewed 1749 times

Jee-Bee · Post by **Jee-Bee** » Tue Jun 05, 2018 6:49 pm

Nice for FEM removing holes, not working radii etc

DeepSOIC · Post by **DeepSOIC** » Tue Jun 05, 2018 7:39 pm

Cool feature

saso · Post by **saso** » Tue Jun 05, 2018 7:53 pm

Nice

freecad-heini-1 · Post by **freecad-heini-1** » Fri Jun 08, 2018 2:17 pm

Nice to see this feature.

NormandC · Post by **NormandC** » Fri Jun 08, 2018 10:08 pm

In Solid Edge (Parasolid-based) there is a similar utility and I find it extremely useful.

It would be really great if some FreeCAD developer were to add GUI tools in FreeCAD to use this new OCCT feature. One who already experimented with it. Hint, hint.

Would the Reverse Engineering workbench be a good place for such a utility?

Post by **bernd** » Sun Jun 10, 2018 3:59 am

Jee-Bee wrote: ↑Tue Jun 05, 2018 6:49 pm Nice for FEM removing holes, not working radii etc

something like this ... https://forum.freecadweb.org/viewtopic. ... 98#p238398 If that would work it would be as good as all the CompSolid stuff we got with occt 6.9 and DeepSoics BooleanFragments in FreeCAD

tanderson69 · Post by **tanderson69** » Sun Jun 10, 2018 12:25 pm

bernd wrote: ↑Sun Jun 10, 2018 3:59 am something like this ... https://forum.freecadweb.org/viewtopic. ... 98#p238398 If that would work ...

That solid fails the normal check geometry(not bopcheck). I would call that 'corrupt' and I would guess most modeling algorithms will fail with that as input. IMHO: a manual fix is the only solution. Extract faces, fill voids with new faces and a sew operation. Something as simple as that, I would just start from scratch using the imported geometry as only a guide.

Post by **kkremitzki** » Sun Jun 10, 2018 2:28 pm

OCCT 7.3 is now in the Debian NEW queue waiting for the upgrade to be approved, by the way.

tanderson69 · Post by **tanderson69** » Sun Jun 10, 2018 4:29 pm

kkremitzki wrote: ↑Sun Jun 10, 2018 2:28 pm OCCT 7.3 is now in the Debian NEW queue waiting for the upgrade to be approved, by the way.

thank you.

fun with occt 7.3 defeaturing

fun with occt 7.3 defeaturing

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Re: fun with occt 7.3 defeaturing

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Re: fun with occt 7.3 defeaturing

Re: fun with occt 7.3 defeaturing

Re: fun with occt 7.3 defeaturing