Full Version: How to make a 2D curve follow the shape of a 3D object (like a box) in MoI3D?

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Thank you, Frenchy. But is there any way I can cut just the top part? I figured out my own method — I create a line, then cut with a surface, use “Disconnect” to separate them, and extract the line. But it seems like a multi-step process, so I wanted to see if there’s a quicker solution.

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Frenchy's method looks right to me. Just select the surfaces that you want the line to be projected onto by selecting the solid and then clicking again on the surfaces you want the line projected to. There's no need to create an intersecting surface first. You can move the newly created curve to any convenient location or use it where it is.

Martin.

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Hi KhoeHuynh,

re:
> But is there any way I can cut just the top part?

If you select the top face as the projection target then it will only make a projection there.

You can select face or edge subobjects on a solid by a second click on it. The first click will select the whole solid, and then when the whole solid is selected a second click on it will "drill in" to select faces or edges.

So in your case where you want to project a line onto the top face, select the line:



Then run Construct > Curve > Project.

The prompt in the upper right corner of the window will say "Select projection target".

Select the top face by 2 clicks on the box, the first click will select the whole box and the second click on it will drill in to select just faces or edges:



Then click "Done" or right click in a viewport (shortcut for "Done") and you'll be at the last step in the project command where you can adjust the projection direction. Click "Done" or right click in a viewport again to finish the Project command with this result:



Note that if you want to actually cut the whole box into 2 separate solid chunks you can use boolean difference to do that without needing a separate projection step and if you want to cut just the top face into 2 separate faces you can use Edit > Trim to do that without needing a separate projection step either.

- Michael

Image Attachments:
project_on_face1.jpg  project_on_face2.jpg  project_on_face3.jpg 

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Yep more speedy than my separate solution! :)

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