In-Polyhedron Test
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2 Comments on In-Polyhedron Test
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tolga on
Fri, 16th Oct 2009 19:23
hello.. this looks like a quite useful code…
but there is a problem i cannot figure out.
i have the parameters for a surface : triangles, points and normals.
my problem starts here: the normals are not normals for triangles but they are normals at the points.
however your function requires the normals for triangles. Is there a way to estimate the normals for triangles from the normals of the points, so that I can use your function?
i will be so glad to hear your any possible solution for this.
thank you in advance.
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Luigi Giaccari Reply:
October 16th, 2009 at 22:57
To get the normals of triangles you don’t need to have normals in points.
If you have Matlab R2009a you can use the computational geometry toolbox to get a conform outward normal for each triangle. There is a built in function.
To get your own code you need to compute the nomral for one triangle (use cross product) and then perform a propagation on the neighborhood triangles keeping the orientation of normals. It is not the easiest thing but not even the most diffucult, try it and let me know.
Luigi
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