Re: NURB patch documentation error

[Roger H. <rog...@mi...>]

Yes this was a problem in QD3D.

I checked my C++ header files from before Quesa and they say

	float*					    	uKnots ; // contains numRows + uOrder values
	float*					    	vKnots ; // contains numColumns + vOrder values

Roger.



On Friday, August 27, 2004, at 10:53  pm, James W. Walker wrote:

> It looks like the documentation of TQ3NURBPatchData is wrong, both in 
> QuesaGeometry.h and in the QD3D manual.  I thought I'd mention it here 
> before changing QuesaGeometry.h, just in case I am misunderstanding 
> something.
>
> The description of the uKnots field says "Array of knots in the u 
> parametric direction.  The number of these knots is the sum of uOrder 
> and numColumns.  The values must be nondecreasing."  That implies that 
> numColumns is the number of control points in the u direction. But the 
> description of numColumns is "Number of control points in the v 
> parametric equation.".  So, at least one of these must be wrong. I've 
> come to the conclusion that the descriptions of numRows and numColumns 
> are swapped.  That seems to be consistent with the NURB patch example 
> in Geom Test.
> -- 
>   James W. Walker, ScriptPerfection Enterprises, Inc.
>   <http://www.write-brain.com/>
>
>
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