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I am a very beginner modeling. I am struggling to make UV editor and now trying this one : enter image description here

Question is how to display only part of eye. When I try to project eye on object, it return surplus part as well. How can I make like this ?enter image description here

What I did on process is that (1)separate eye part from main object (2)add image texture (3)smart UV project. I would appreciate if it is explained in detail. Thank you.

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You have the correct node setup for the material, but the image you are using needs to be alpha masked.

That is to say, you would need to take the image into (for example) Photoshop, and "cut out" the eyeball so that it sits on a transparent background. You would then need to save this a file format that allows transparency (e.g. .PNG).

This isn't working because, at the moment, your eyeball sits on a black background. Your nodes tell Blender only to show the image when it has alpha (i.e. only show it where it is not transparent). This is correct, but the problem is that your image is not transparent anywhere, so all of it shows.

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