I'm a grad student at UCCS (The University of Colorado at Colorado Springs),

and I'm doing a NURBS project for my geometric modeling course. We're using

some Indigo SGI's, and I'm running into a problem with trying to figure out

what the basis function should be. Is this part of the Graphics Library and

can it be called somehow? I'm thinking about using the basis function for

NURBS out of the Foley and Van Dam book, but I know that this one is

different from the one SGI uses. In particular, SGI seems to handle the

case where the denominator of the basis function is zero differently than

it is handled in the Foley/Van Dam book. Any help anybody can provide

would be appreciated.

-Andy R. Hoople

I am trying to find out about the Laws' basis functions. They are

referenced in "Computer Vision," Ballard and Brown in a chapter on texture.

They only list four of the twelve matrices. The reference is a PhD

disertation at USC in 1980.

I would greatly appreciate references to these basis functions being

applied. Just the matrices themselves would be great.

Thanks in advance.

Dan Campbell

3. Bartel's basis evaluation function

5. Worley's Cellular Basis Function

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10. Constructing NURBs from Bicubic Splines and their basis matrix

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13. basis functions for certain NU(R)B knot vectors

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