I would like to close of a model that I cut down using a boolean modifier so it is watertight, which is important for a different programm.

Although the images don't show it, the entire car is selected not only the intersecting edges that you can see in the top image.

The main problem is that I can't figure out how to split a plane into faces with a different, complex object. Also I need to be able to script everything so selecting vertices by hand for example isn't an option

enter image description here

So far I've: Added thickness to the plane Used the addon rob recommended isntead of the default boolean modifier Deleted only the faces of the plane Use the grid that results as a knife project onto a plane

The current problem is how I can only select the outer vertices instead of all, which would then be used in the knife project.

enter image description here

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    $\begingroup$ I have not tried it but there is an alternative Bool Tool built in, you just need to enable it. blender.stackexchange.com/a/109510/4937 $\endgroup$ – rob Aug 9 '18 at 10:32
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    $\begingroup$ @rob The results of the tool are much better $\endgroup$ – WhatAMesh Aug 9 '18 at 10:36

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