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The place for all topics related to the 'Shapefusion' tool of DAVID.

Saving File

Postby Bruno » Sat Nov 08, 2008 9:29 am

When i save a file i can coose (in german language) "Oberflächennormalen". What does this means?
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Postby Bongobat » Sat Nov 08, 2008 11:07 am

Hi Bruno,

I think it means you can save the surface normal direction with the model. A surface normal in a 3D model is normally used for lighting calculations.They can be manipulated to give the model a different appearance. for example you can average the normals to give a smooth appearance and reversing a normal usually causes the face to be invisible. You can find more info here: http://en.wikipedia.org/wiki/Surface_normal
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Postby Bruno » Sat Nov 08, 2008 11:58 am

Thanks Bongobat
I have to studie about this, maybe this is stuff i do not check :(
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Postby MagWeb » Sat Nov 08, 2008 12:53 pm

Hi,

to simplify:

A normal(vector) points towards the direction one single face (a plane between at least three points of the pointcloud nearest to each other) looks to.
So, if you flip the direction of all normals, a scan of a footprint in the beach (negative) becomes the sole of the foot (positive) - or more abstract: a concave shape becomes convex.

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