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Extracting Geometry using a alpha map

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HI Guys, I'm trying to do a little project and was wondering if you guys have any tips or ideas on how i could extract geometry from an object using an alpha map.

For example say a Ming Vase, how could i seperate the geometry of the white bits and the blue bits?

I found a tutorial on zbrush,

but i'm hopeless in zbrush.

Any ideas if you can do this sort of thing using 3dmax, rhino, meshmixer, fusion360 etc?

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On Rhino you have an option to adapt a surface to a curve or other surface. I'm not an expert on that option since I only used it to make an eyeglasses. But Rhino has lots of tutorials about that option.

You can see by the img of the video that it 'might' fit what you are looking for

 

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