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Valid Body with volume equal to zero
2

Valid Body with volume equal to zero

Valid Body with volume equal to zero

(OP)

Hi everybody

I have a valid Body with volume equal to zero (in NX7.5 and NX8.02) !!!

Does anybody found the same problem ?

Thanks in advance


Regards
Didier Psaltopoulos
http://www.psi-cad.com

RE: Valid Body with volume equal to zero

Are you sure it is not a sheet body?
Can you post a picture or even better, the part file?

www.nxjournaling.com

RE: Valid Body with volume equal to zero

a picture with the part navagator, and the part, showing would be nice

RE: Valid Body with volume equal to zero

How are you measuring the volume of this 'valid Body'?

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RE: Valid Body with volume equal to zero

Wow a black hole part !

Maybe do an Examine Geometry and see what comes up.
Analysis -> Examine Geometry

RE: Valid Body with volume equal to zero

The part posted fails geometry checks.
It reports as a solid body, but the outer bosses appear to be missing faces. If you trim those off, then the body passes geometry checks.

www.nxjournaling.com

RE: Valid Body with volume equal to zero

(OP)
Hi,

Did you select the body or all selectable entities ?

I found sometimes that I have tiny and misaligned edges on a valid body but It's the first I have a volume equal to 0

I agree with you that some faces didn't appear in shading

What do you mean by "trim those off" ?

Could you send me the clean part to understand ?

Thanks


Regards
Didier Psaltopoulos
http://www.psi-cad.com

RE: Valid Body with volume equal to zero

When I select all the geometry and run the check, it returns a modeling error and crashes the examine geometry check (a sure sign of bad input). I just used 2 datum planes to trim off the ends (including the bosses), the remaining geometry passed the checks.

Looks like you'll have to try to fix the bosses. I see from your picture that it is a dumb solid, have you tried Heal Geometry?

www.nxjournaling.com

RE: Valid Body with volume equal to zero

(OP)
Hi Cowski

I didn't understand your first answer.

I have used trim body to isolate the problem. But i didn't see the shading problem in this area.

I thought is was enough to select only the body for checking validity.

It seems to be a bug.


Regards
Didier Psaltopoulos
http://www.psi-cad.com

RE: Valid Body with volume equal to zero

Quote (DidierPSICAD)

I thought is was enough to select only the body for checking validity.
That will only allow you to run the body checks. To run all the checks you need to use select all or use a window selection (make sure your filter is set to "no selection filter"), this will pick up the faces and edges along with the solid itself.

Good news: I ran the heal geometry on the chunk of the body you posted and it fixed the problems and then passed the geometry checks. Heal geometry can be found at File -> Export -> Heal Geometry...

www.nxjournaling.com

RE: Valid Body with volume equal to zero

(OP)
Hi Cowski,

Thanks a lot for this very good answer. I never used heal geometry, it's very helpful.

What's the purpose of checking the solid if it's not enough ?


Regards
Didier Psaltopoulos
http://www.psi-cad.com

RE: Valid Body with volume equal to zero

When you buy a car you will not only check the oil level , you will most probably look at other details too.
On large models the examine geometry can take considerable time to compute, then it is nice to be able to isolate the checking into smaller checks.

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