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I have a question. The situation is as follows: situation

So there is a sphere and a prism going straight through the sphere.

Now I would like to:

  1. Add vertices and edges to the sphere mesh along the line of intersection
  2. Select all the surface-faces within the region of intersection to work with them e.g. apply a specific material

I feel like there has to be a way to do it without scripting, but I really don't know how...

Thanks for any help in advance:D

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2 Answers 2

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Actually I recalled another option called Knife Project.

In Edit mode of the cube remove the top face like this:

enter image description here

In Object mode select cube first and sphere second.

enter image description here

Then go to edit mode. Select all. Make top orthographic view and use Knife project operation from Mesh menu.

enter image description here

Check Cut trough box

enter image description here

Now you can delete your cube and when you go to edit mode with your sphere you can see faces were intersected. So you can select them separately and assign another material.

enter image description here

Hope it helps!

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  • $\begingroup$ For me it worked even without top face delete. I think if you check box "Cut trough" no need to delete top face. And in this case it'll make intersection in the bottom of the sphere as well $\endgroup$ Jan 1, 2021 at 20:03
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I think Boolean modifier could help.

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    $\begingroup$ Thanks for contributing an answer! Please consider expanding on it so that it is more useful for the OP and for future visitors. Thanks :) $\endgroup$
    – Timaroberts
    Dec 26, 2020 at 19:45
  • $\begingroup$ @LiliaLilia Consider merging both answers $\endgroup$
    – susu
    Dec 28, 2020 at 19:34

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