[Bf-funboard] Restrictions in the order of the NURBS Surface

[Bassam Kurdali]

I think you just need to press the endpoint U and V buttons, the default
is the uniform U and V buttons.. it's a nurbs thing, I guess.
If it isn't already, this should be in the docs.

On Fri, 2006-12-29 at 18:49 -0800, Siddharth Palaniappan wrote:
> Can anyone advise me as to whom I should be asking these questions? No
> one seems to be answering....
> 
> Any help would be greatly appreciated.
> 
> Thanks
> 
> Yours Sincerely,
> 
> Siddharth
> 
> ----- Original Message ----
> From: Siddharth Palaniappan <siddharth_univ at yahoo.com>
> To: bf-funboard at projects.blender.org
> Sent: Thursday, December 28, 2006 11:32:34 PM
> Subject: Re: [Bf-funboard] Restrictions in the order of the NURBS
> Surface
> 
> Hi,
> 
> I wanted to add that I have noticed that the bezier surface is not
> being drawn correctly on the control grid. Rather I think it leaves
> the first row/column of the control grid. Can someone please check
> this? The bezier surface(NURBS with bezier knots) should be such that
> the surface should interpolate thru the end control points. That is
> the end knot vectors should have degree + 1 multiplicity of knots. Is
> there anyway , I can set the knot vectors for the surface myself? Is
> there a way I can set the knot vector via the Python Script?
> 
> Thank You,
> 
> Yours Sincerely,
> 
> Siddharth
> 
> ----- Original Message ----
> From: Siddharth Palaniappan <siddharth_univ at yahoo.com>
> To: bf-funboard at projects.blender.org
> Sent: Wednesday, December 27, 2006 7:47:07 PM
> Subject: [Bf-funboard] Restrictions in the order of the NURBS Surface
> 
> Hi,
> 
> I'm kinda new to blender. I see that there is a restriction in the
> order of 6. I was wondering why this restriction has been placed. Also
> I find it wierd to work with bezier knot vector arrangement. For
> example, if i have 4 points along U and V(default arrangement) and try
> order = 4 along U and V with bezier knot arrangement. I get no patch.
> But If i reduce the order to 3 along U and V, i get a patch.(a
> quadratic patch) 
> 
> I tried increasing the vertices by extruding the edges along U and V
> and then used order 4 along U and V. After extruding, we have a 5*5
> control net and I get a cubic patch. 
> 
> The point is , it seems that there has to be an extra set of points
> which are usless when i want a bezier patch. I was wondering if the
> term order is wrongly used for degree? After all in bezier
> curves/surfaces,  order = degree + 1.
> 
> I am currently trying to write an importer/exporter and i find it
> difficult , as certain patches are more than order 6. And also because
> of the bezier problem.
> 
> If these problems could be fixed, it would be great since Blender
> could be greatly be used in our university in research. I dont know if
> the things I mentioned above are bug/problems. If not, please explain
> them to me.
> 
> Thank you,
> 
> Yours Sincerely,
> 
> Siddharth
> 
> 
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