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The selected curve and the unselected curve are perpendicular to each other. The selected curve passes through the unselected curve at arbitrary points.

Hi,

I'd like to have about an efficient way of cropping the selected curve at every point where it intersects with the unselected curve (see picture).

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    $\begingroup$ Did you try the Boolean modifier? $\endgroup$ – VRM Mar 21 '15 at 20:08
  • $\begingroup$ Nope. How do I do that? $\endgroup$ – Matthew Harrison Mar 21 '15 at 20:09
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    $\begingroup$ this video should get you started. It will teach you the various ways you can use the modifier. $\endgroup$ – VRM Mar 21 '15 at 20:14
  • $\begingroup$ Booleans seem to have enabled me to get the desired effect. Thank you for your help! Is there any way in which I can mark your answer as having solved the problem? $\endgroup$ – Matthew Harrison Mar 21 '15 at 20:22
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    $\begingroup$ I can post an answer for you, give me a minute $\endgroup$ – VRM Mar 21 '15 at 20:44
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You can achieve this result by using the Boolean modifier.

Select your large curved mesh, and add a Boolean modifier set to Difference.

Add modifier

This will make the curved wall follow the contours of the arch in the direction of the Normals. You may need to re-calculate them (Ctrl+N) to get the desired result.

Boolean Normals

Now if you apply the modifier, you can remove the arch mesh and you should end up with a completed single mesh with the desired arch shape in it.

Final mesh

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