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_void_

Volume rendering. Finding dominant axis

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Hello,

 

I would like to get practical skills with volume rendering and started going through articles related to the subject.

 

During voxelization process, each triangle of the mesh is projected orthographically along the dominant axis of its normal so that to maximize the projected area.

To find the dominant axis, you have to find the axis A which gives the maximum value for |N * A|, where N is a triangle normal and A is one of the three main axes of the scene.

 

Could you please elaborate on this formula? It is not obvious to me how this dot product is related to projected area of the triangle.

 

Many thanks!

Edited by _void_

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After visualising a triangle in space, it gets pretty clear wink.png

 

The less angle between the triangle normal and the main axis, the greater projected area will be.

What we are doing with that formula is just calculating the angle between them.

 

Thanks everyone.

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