Newbie alert: making a bottom face?

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 From:  jason (JASONW)
9694.1 
Hey folks,
Just starting with MoI, and trying to figure out what I'm doing wrong. I have this very organic bowl I'm trying to make... but I can't seem to get the inside bottom...

The bottom is flat, but the inside is slanted down and flattens out at the bottom. I'll be putting a drain hole in that corner...

Anyone able to point me to where I should be looking in the help, or whatever? I'll be importing this into Alibre (similar to soldworks), to attach to more items. Somehow I managed to do it once, but I can't figure out how I did it!

Anything constructive would be appreciated..

Thanks!
Jason
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 From:  Frenchy Pilou (PILOU)
9694.2 In reply to 9694.1 
Depending of what do you want exactly...

If it's the Bottom bottom : select it / Construct/ Planar
If it's between the 2 curves : select them Loft, or Sweep (with one segment more)

If it's only the internal curve : draw a mini circle somewhere in the middle
and draw a line and make a Sweep
etc..


---
Pilou
Is beautiful that please without concept!
My Moi French Site My Gallery My MagicaVoxel Gallery
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 From:  jason (JASONW)
9694.3 
Thanks for the response!

At one time I did try that, but then I was left with a hole in the middle. ;}

I created a small circle in the same plane as the upper floor, and then in the lower floor. I selected the inside edge and the inside circle, then lofted. As near as I can tell, it did the right thing, with the exception of the circle in the middle.

Did the same for the bottom, and it looks good.

Is there a better way? The docs seemed to say I could take the inner perimeter (which is non-planar), and then draw another straight line and boolean form them into a floor. But I couldn't make that work...
I guess it only works for planar, and not organic?

Thanks!

Jason
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 From:  Michael Gibson
9694.4 In reply to 9694.1 
Hi Jason, so yes (as Pilou also mentions above) since the bottom is flat that can be sealed off with Construct > Planar. You can either select the bottom flat curve and use Construct > Planar to build a surface and then use Edit > Join to glue the 2 surfaces together. A shortcut way is to just select the surface instead of the curve and then run Construct > Planar which will do those same steps automatically so you don't have to join it as an additional step.

Then for the bottom of the inside, the problem there is the inner curve is not planar. It is not warped too much though so it's not fully clear to me if you want a flat inside bottom or if you want some kind of curved surface for the inside bottom.

If you want a flat inside bottom it would probably be easiest to squish that curve to be flat before you started constructing off of it. You can do that by selecting it and using the edit frame grips in a side view to squish it flat, using "flat snap" as described here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=3378.4

Or if you want the bottom to be kind of rounded a bit you would probably do something like a sweep to make a round bottom shape that extends out past the inside wall and then use Edit > Trim to intersect it.

That would look something like this, 2 profile curves:



run Construct > Sweep to build a simple extended bowl:



Then you'll need to use Edit > Trim to cut both the sweep and the inside surface with each other and then Edit > Join to glue the pieces together.

If you want a smooth regular looking bottom it will probably be easier to form it with some extended surface like this and then cut it in rather than trying to construct a surface directly to your irregular inner edge curve although you could try that also. It's easier to get simple smooth shapes with constructing extended sheets that are then trimmed like this though.

- Michael

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 From:  Michael Gibson
9694.5 In reply to 9694.3 
Hi Jason,

re:
> Is there a better way? The docs seemed to say I could take the inner perimeter
> (which is non-planar), and then draw another straight line and boolean form them
> into a floor. But I couldn't make that work...
> I guess it only works for planar, and not organic?

It's not that it's organic vs planar, it's that your object is an open surface instead of a closed solid.

Booleans are focused on working on solids, they determine which pieces to keep and which to discard based on what solid volume they are contained inside of.

When your object is not a closed solid you will usually need to use Edit > Trim to cut it rather than booleans.

The Edit > Trim command cuts curves or surfaces and then you manually pick which areas you want to keep or discard, then you use Edit > Join to glue the trimmed surfaces together.

Booleans are kind of like a "batch mode" that does that whole job of intersecting, discarding and joining all together in one operation so it can save time but your object needs to be a closed solid in order for the booleans to be used.

- Michael
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