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Re: Compute_Mesh_Normals returns normal vector [0, 0, 0] [message #49116 is a reply to message #49115]

Thu, 22 June 2006 10:26

Rick Towler
Messages: 821
Registered: August 1998

Senior Member

spidersapiens@gmail.com wrote:
> According to the online help, the function "Compute_Mesh_Normals"
> should return "a 3 x M array containing a unit normal for each vertex
> in the input array.". However when I used it in my program, it's
> returning a couple ZERO vector [0, 0, 0] though the rest are normal
> unit vectors. What does zero vector mean in this case or should I say
> this is an IDL bug?

Just a guess, but maybe a few of the verts are identical? I think for
this to happen nVerts_per_poly-1 vertices would have to be the same.
This might be in your data or it could be a subtle error in your
connectivity array. Or it could be neither of these :)

-Rick

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[Message index]

		Re: Compute_Mesh_Normals returns normal vector [0, 0, 0] By: James Kuyper on Thu, 22 June 2006 10:40
		Re: Compute_Mesh_Normals returns normal vector [0, 0, 0] By: Rick Towler on Thu, 22 June 2006 10:26

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