The 2D (surface) NURBS demos seem to work OK, but when I try to code a
simple line BSPLINE based on C demos I've found, this section of code:
ctrlpoints=[[-4.0, -4.0, 0.0], [-2.0, 4.0, 0.0], [2.0, -4.0, 0.0], [4.0, 4.0, 0.0]]
glMap1f(GL_MAP1_VERTEX_3, 0.0, 1.0, ctrlpoints) # no stride or order in pygl
seems to fail with this error:
Traceback (most recent call last):
File "./netplot.py", line 158, in on_display
self.drawsyn()
File "./netplot.py", line 72, in drawsyn
glMap1f(GL_MAP1_VERTEX_3, 0.0, 1.0, ctrlpoints) # no stride or
order in pygl
OpenGL.GL.GLerror: [Errno 1281] invalid value
Since the docs weren't clear on how to format ctrlpoints as far as I could
find, I have also tried changing the format of ctrlpoints to this:
ctrlpoints=[-4.0, -4.0, 0.0, -2.0, 4.0, 0.0, 2.0, -4.0, 0.0, 4.0, 4.0, 0.0]
I think the answer lies with ctrlpoints but I'm at a loss for now. Any
ideas?
Searching the archive, I notice somebody asked about getting a BSPLINE
type line working a while back. The answer he got was that the 2D demos
work . . . true enough, but maybe there is something else going on.
Thanks,
Rich
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