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STL Format

Posted by arget888

arget888

STL Format
February 12, 2014 02:49PM

Registered: 10 years ago
Posts: 72

Hello,

I am experiment with a java Programm which can create a 3D-Model from a DICOM File (is the result which you get from an ct or mrt). I read a lot now of the stl format on the web, but i couldn't found out how to calculate the normal vectors for each triangle. The ascii formate of a triangle in stl is:

facet normal Ni Nj Nk
    outer loop
        vertex vx vy vz
        vertex vx vy vz
        vertex vx vy vz
    endloop
endfacet

My Question is how to calculate Ni, Nj and Nk.

I hope someone can help me

greeds

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rhmorrison

Re: STL Format
March 12, 2014 09:24AM

Registered: 14 years ago
Posts: 3,742

Code for finding the vertex normals in Java?

How to find surface normal of a triangle

Find the normal angle of the face of a triangle in 3D, given the co-ordinated of its verticies

Calculating a Surface Normal

Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse

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arget888

Re: STL Format
March 12, 2014 05:06PM

Registered: 10 years ago
Posts: 72

Thanks, i solved the problem now by myself but i will use the links to compromise my code smiling smiley

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Re: STL Format
June 09, 2014 10:09AM

Registered: 10 years ago
Posts: 1,381

DICOM: The Digital Imaging and Communications in Medicine (DICOM) standard for distributing and viewing any kind of medical image regardless of the origin

Have you posted the software to convert DICOM?

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arget888

Re: STL Format
June 09, 2014 02:25PM

Registered: 10 years ago
Posts: 72

Sorry no, i had no time to finish it, i started it in java but i have a few mistakes in it! I plan to finish my work in the next time then i can post it if you want smiling smiley

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Re: STL Format
June 09, 2014 02:40PM

Registered: 10 years ago
Posts: 1,381

I think it would be a great contribution, as many medical facilities start using 3d printers they will want to experiment, and learn about the technology. Your code could make the learning curve shorter, or offer a solution that is unique for their application.
Tks!

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arget888

Re: STL Format
June 10, 2014 03:58AM

Registered: 10 years ago
Posts: 72

Yeah, as soon as the programm works i will post it for you, so that everyone can use it!