Trivial but...
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 From:  Michael Gibson
9857.8 In reply to 9857.7 
Hi Pilou,

> I have only your result when I am in the mode "remove" state !

Yes, that's the default. It can be convenient in some cases to switch to "keep" state, if it is helpful then certainly do that.

You can peform a mutual trim though either with "remove" or "keep" state, the above 2 videos show you a demonstration on how to do it using remove mode. That was to answer your question about whether a mutual trim was possible to do with the trim command or not.


> And if i make a sufficient large selection for take the "intersection" volume resultant
> that is difficult because we don't see very well this "internal" intersection!

Your question never mentioned a large selection, I was answering your question about the case you had shown.


> Does we have an option for this "internal" volumes selection removing
> or this "external" volumes selection keeping ?

Yes, it's the Boolean Union command. In the kind of case that you are describing where there are a large number of surfaces, I would recommend to not use the Trim command. For the kind of case you are describing you should form your objects into closed solids before trying to cut them, and then use boolean union to get your result rather than using the Edit > Trim command for that type of use.

The booleans do a similar job as Trim, except that they automatically discard or keep pieces based on which volume they are contained inside of. If you need something that will help target internal pieces without needing to do any manual selection, it is the booleans that are set up to do that.

Trim is meant to be a lower level surface modeling operation, it's not something that you should try to use in a situation where there would be a large number of pieces that are difficult to select. You would want to use booleans in that kind of case.

- Michael

EDITED: 27 Jun 2020 by MICHAEL GIBSON

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Message 9857.9 deleted 17 Jan 2021 by WAYNEHILL5202

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 From:  Frenchy Pilou (PILOU)
9857.10 In reply to 9857.8 
@ Michael OK I can understand that...
Of course will be more easy to make the boolean then kill caps if this result is wanted.
All that was not clearly evident (for me ;)
Thx for the clarification!
Here with a Boolean merge (must caps killed)

EDITED: 27 Jun 2020 by PILOU

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 From:  Frenchy Pilou (PILOU)
9857.11 In reply to 9857.9 
@Wayne No it's a sort of intersection of volumes who is wanted not a trim by a plan! ;)

The trim was well realised
it was just the specific result that i wanted (hollow without caps )
that was not success in one operation...(by me :)

EDITED: 27 Jun 2020 by PILOU

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 From:  wayne hill (WAYNEHILL5202)
9857.12 In reply to 9857.11 
@Pilou,

Ok. Downloaded your sample. Boolean unioned all parts, created a jagged trim line by selecting the intersect lines between the halves and joined them as a jagged trim line. Selected the solids, and trimmed by the jagged intersect line. Pulled them apart and a middle section appeared between the two halfs. You looking for a clean divide. Got it.

Wayne
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 From:  Frenchy Pilou (PILOU)
9857.13 In reply to 9857.12 
See my other solution above when you post your! ;)
---
Pilou
Is beautiful that please without concept!
My Moi French Site My Gallery My MagicaVoxel Gallery
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 From:  Frenchy Pilou (PILOU)
9857.14 
Another solution (in fact that is that I made for my first image of the thread;)

but curious tearings appear during the Boolean union!
here second volume is move down a little before the Boolean for have a more sinuous intersection!

Select the 2 volumes Curves Isect
Boolean the 2 volumes
Trim by the curve (from Isect)
Result that I want (except the artifacts (?) )



Artefact are not yet existing when I make some rendering
here with the very easy and free CadRays who accepts Step and IGES from Moi ;)
https://www.opencascade.com/content/cadrays


EDITED: 27 Jun 2020 by PILOU

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