Solid Tools > Subtract  Topic is solved

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Solid Tools > Subtract

Postby ketchupu » Tue Nov 14, 2017 7:14 pm

Hi, I just started using Sketchup 2017 a couple days ago, and with watching some of the online tutorials, I have figured out how to use the the Subtract Tool with basic objects, like a smaller cube subtracted from a larger cube. However, I am having trouble subtracting this oval cylinder out of a curvy wall. I have converted both to separate components. Both components are Shiny with Solid Inspector v2. My ultimate goal is to print this out on a 3D printer. I have attached a screenshot and the skp file as well. Can some provide some insight into what I am doing wrong? Any help would be much appreciated.

Solid Curve Snapshot.jpg
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Re: Solid Tools > Subtract

Postby juju » Tue Nov 14, 2017 7:25 pm

Solid Tools is a Pro only function. Your profile indicates that you are using Make, thus the tool will not be available. Unless you're using the trial of SU Pro, it should be available then.
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Re: Solid Tools > Subtract  Topic is solved

Postby TIG » Tue Nov 14, 2017 7:39 pm

You are running into the well documented 'tiny-geometry' limitations of SketchUp.
Sketchup regards points closer that 1/1000" apart as being coincident.
Thus tiny any such edges are not created and the faces they support are then missed.

The simple trick is to scale up the two parts x10 or x100 and then doing the subtraction.
When you have the desired form you can scale it down to the original size...
The tiny geometry can exist, but it can't be created directly.
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Re: Solid Tools > Subtract

Postby slbaumgartner » Wed Nov 15, 2017 2:58 pm

ketchupu wrote:However, I am having trouble subtracting this oval cylinder out of a curvy wall.

Could you clarify what you mean by this? What sort of trouble are you encountering?
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Re: Solid Tools > Subtract

Postby ketchupu » Thu Nov 16, 2017 6:54 am

juju wrote:Solid Tools is a Pro only function. Your profile indicates that you are using Make, thus the tool will not be available. Unless you're using the trial of SU Pro, it should be available then.

Yes, I currently have the trial version for now, but it does include the Solid Tools function. I have tried everything including the Intersect Faces (in the Make version). I think I see the answer in the next reply ...
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Re: Solid Tools > Subtract

Postby ketchupu » Thu Nov 16, 2017 6:57 am

TIG wrote:You are running into the well documented 'tiny-geometry' limitations of SketchUp.
Sketchup regards points closer that 1/1000" apart as being coincident.
Thus tiny any such edges are not created and the faces they support are then missed.

The simple trick is to scale up the two parts x10 or x100 and then doing the subtraction.
When you have the desired form you can scale it down to the original size...
The tiny geometry can exist, but it can't be created directly.

Thanks a lot! This makes a lot of sense. Even with other models I have made, I have been pulling my hair it with tiny imperfections around curves that appeared somewhat randomly
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Re: Solid Tools > Subtract

Postby ketchupu » Thu Nov 16, 2017 6:58 am

slbaumgartner wrote:
ketchupu wrote:However, I am having trouble subtracting this oval cylinder out of a curvy wall.

Could you clarify what you mean by this? What sort of trouble are you encountering?

One or both objects would disappear, or there would be lots of imperfections (missing faces) in the resulting structure.
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