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Rob-GB

How do I separate two solids?

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Rob-GB

Have somehow combined three risers with the adjoining stair string:(

 

Have tried the Separate tool but not managed to get it to work. I am trying to render a 3D model of a stair ( my first attempt of more than one object ) and this is causing a problem with grain direction for the applied material.

Any advice would be most welcome, thank you.

 

Rob.

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KennyJ

Try holding CTRL + Clicking the part of object you want to delete. That should Select the solid shape that you union to the original. Then you can just simply press delete. Hope this works for you, I tried it on two union Cubes and it worked fine not sure of the outcome on more complex shapes though. Good luck.

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shift1313

were the shapes originally separate solids? Are they touching?

 

Separate wont work if the bodies create a single volume. For instance if you had to stair treads that were physically separated by space but you joined them using the UNION command, you could use Solidedit>Body>seParate Solid. If these two stair treads were physically overlapping so the union process created one volume, Separate would not work.

 

Can you post a screen shot of what you are trying to separate. My guess is the slice command will be your best friend. If you have a lot of stairs it may be easier for you to explode the entire thing(once) which will separate it into faces. you can then extrude all of the faces at once to create your solid objects again. I dont recommend doing this but i have done it before.

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Organic

Explode them?

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shift1313

command EXPLODE or the little Dynomite icon. Its used to modify objects inside blocks but you can use it to break down solids. If you explode a solid it should leave the faces intact. If you explode it again you will be left with lines and arcs.

 

if you are working in blocks you can also use the command XPLODE to modify parameters within the block individually or globally.

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ReMark

As per your AutoCAD Help file (anyone here use this feature besides me?):

 

"You can separate (take apart) composite solids. The composite 3D solid object cannot share a common area or volume."

 

Maybe it's AutoDesk's fault in the naming of the command. It gives the user a false impression. Perhaps the programmers can come up with a beefed up version of the command that can do what some users are actually expecting to happen.

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shift1313
As per your AutoCAD Help file (anyone here use this feature besides me?):

 

"You can separate (take apart) composite solids. The composite 3D solid object cannot share a common area or volume."

 

Maybe it's AutoDesk's fault in the naming of the command. It gives the user a false impression. Perhaps the programmers can come up with a beefed up version of the command that can do what some users are actually expecting to happen.

 

Thats where my answer came from :-D

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ReMark

Oops. Mea culpa. Well at least two of us know that Help exists for a reason.

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Rob-GB

Thanks guys.:D

Tried everything else then ended up exploding them and remaking the components.

Lessons learnt:

1) Be careful when using UNION

2) Think through to how the model will be rendered

3) Don't panic, post problem here and go out for a walk (to nearest pub):thumbsup:

4) Try all suggestions leaving least favourite till last ( because that will work and hard lessons are most remembered!)

 

Just need to sort the rendering out now...

Rob.

P.S. Remark:- Acad help was first port of call but I found it lacking in this area. I think the writers often assume we have the same thought processes they have when writing the file. I also suspect they would have difficulty in following my written instructions on how to make this staircase for real.:)

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ReMark

It doesn't help (no pun intended) that Help was probably written by programmers. That's why one should always have a good after-market AutoCAD book on hand for such perplexing problems.

 

I always keep an original copy of my solids off to one side (on a layer that I freeze) just in case I need to revisit my design.

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Rob-GB
I always keep an original copy of my solids off to one side (on a layer that I freeze) just in case I need to revisit my design.

 

 

Now that is a brilliant, almost Luminous, idea!:D

 

Will make sure to do that in future.

 

Rob.

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skipsophrenic

Anybody use the SLICE command?

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shift1313
Anybody use the SLICE command?

 

 

That was my second recomendation skip:)

 

I find HELP frustratings some times. Its tough because you have to know what you are looking for. There have been a few things that I couldnt find in help. Things i know the command for but search brings up nothing:)

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