I'm pretty much completely baffled about what the 'degree' setting on NURBS curves actually does. Here's what teh VW help guide says:

Quote

The curve degree affects the number of vertices created; the higher the degree value, the greater the number of vertices.

Here's what happens when I try various things:

(when I write "created with" I mean the number I put in the "curve degree" box of the NURBS tool settings)

Each of those shapes is created by clicking on the same 4 points in the same sequence.

Here are some questions for starters:

"Interpolation mode"

1) Contrary to what VW help says, changing the 'degree' in the NURBS tool settings doesn't affect the number of vertices. It does seem to result in a slightly different shape though. So what does it do?

2) If I change the 'degree' number in the OIP, what exactly determines the number of vertices I end up with?

3) If I change the 'degree' number in the OIP, why does a line with degree 3 end up with *more* vertices than a line with degree 4?

4) Is it intended behaviour that changing the 'degree' number in the OIP flips an "interpolation mode" NURBS into being a "control point mode" NURBS?

"Control point mode"

5) Why does the OIP tell me the NURBS has a different degree from the one I created it with?

6) Why does a created-as degree 3 or 4 NURBS have fewer vertices than a created-as degree 2 NURBS?

7) Why does on 'degree 4' NURBS have a different number of vertices compared to another 'degree 4' NURBS (and same applies to the two degree 5 NURBS)?

8 ) Why does one of the degree 5 NURBS have fewer vertices than one of the degree 4 NURBS?

Final question: is it user error, bugs in the software, or bad documentation that's causing the confusion here?

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I'm pretty much completely baffled about what the 'degree' setting on NURBS curves actually does. Here's what teh VW help guide says:

Here's what happens when I try various things:

(when I write "created with" I mean the number I put in the "curve degree" box of the NURBS tool settings)

Each of those shapes is created by clicking on the same 4 points in the same sequence.

Here are some questions for starters:

"Interpolation mode"

1) Contrary to what VW help says, changing the 'degree' in the NURBS tool settings doesn't affect the number of vertices. It does seem to result in a slightly different shape though. So what does it do?

2) If I change the 'degree' number in the OIP, what exactly determines the number of vertices I end up with?

3) If I change the 'degree' number in the OIP, why does a line with degree 3 end up with *more* vertices than a line with degree 4?

4) Is it intended behaviour that changing the 'degree' number in the OIP flips an "interpolation mode" NURBS into being a "control point mode" NURBS?

"Control point mode"

5) Why does the OIP tell me the NURBS has a different degree from the one I created it with?

6) Why does a created-as degree 3 or 4 NURBS have fewer vertices than a created-as degree 2 NURBS?

7) Why does on 'degree 4' NURBS have a different number of vertices compared to another 'degree 4' NURBS (and same applies to the two degree 5 NURBS)?

8 ) Why does one of the degree 5 NURBS have fewer vertices than one of the degree 4 NURBS?

Final question: is it user error, bugs in the software, or bad documentation that's causing the confusion here?

(I've attached the file below)

NURBS.vwx

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