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I apologize for the very basic question, but I have been struggling for some time now with the following task:

I want to create a 3D print of a 2D image by importing it as a plane, subdividing it and the using the displace modifier to obtain a 3D image. However, I have not found a way to crop the original image into the desired shape (circular in this case).

enter image description here

I have tried the boolean modifier, but it does not work for 2D objects. I have also tried to extrude it into a parallelepipedic object and then use a cone and the boolean modifier, but the image would disappear after the operation. Using the knife or subdividing it and deleting the undesired regions manually would be a solution but both are not very elegant. Is there an easy method to do it?

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    $\begingroup$ No. Just unwrap the image onto a cylinder/circle from the beginning. All the import as plane does is create a plane object thats UV mapped to the right proportion of the image. You can do this manually for other objects. $\endgroup$ – AdamTM Jan 16 '18 at 14:56
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It is easier to map the image on a circular mesh.

enter image description here

As an alternative you can create another image (or alpha channel) that defines the circle and use that as a mask to define transparency.

enter image description here

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