Grasshopper

algorithmic modeling for Rhino

3D FingerPrint - need to extract ridges and valleys? Estimation Curvatures

Hello,

I need to extract ridges and valleys of a 3D fingerprint. The output should be a ply file which shows exactly where are the ridges and valleys on 3d fingerprint using different colors.

**Input file** - ply file with just x,y,z locations. I got it from a 3d scanner. Find the out.ply file attached.


**nisha.m234@gmail.com**.

**Algorithm:**
I am trying to find principal curvatures for extracting the ridges and valleys. (in the attached file see page 42. You can read from page 30. I am trying to achieve something like that.) 

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Permalink Reply by Nisha M on July 14, 2011 at 2:28pm

Hey Hannes Löschke! Thanks. 

I am quite new to this method. Do you know of a software that would do this for me or is there an easy way to get this implemented asap.

Permalink Reply by Hannes Löschke on July 14, 2011 at 2:36pm

The only way I have ever uses displacement mapping is in render time to give surfaves more structure. But that's no hlep to you.

 

As far as I know, there Rhino 5 can do displacement mapping.

 

I think with the image GH image sampler you could get something similar displacing the vertices of a very fine base mesh in face normal direction.

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