pyopengl-users

[PyOpenGL-Users] Nurbs curve Rendering?

[Prashant S. <ani...@ya...>]

I am trying to create a nurbs curve in 2d (no 'Z') and here is my code. The curve is not getting rendered. There is something wrong with this piece of code:
Could anybody point me out?

uknots= [0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0]
cntrl = [[25, 50],
            [25, 75],
            [75, 75],
            [75, 50]]
x = 10, y = 10
color = (0,0,0)
            
        """Create a GL display list to draw a Curve."""
        nurb = gluNewNurbsRenderer()
        glNewList(101, GL_COMPILE)
        glPushMatrix()
        glLineWidth(1)
        glTranslate(x, y, 0)
        glColor(color)
        glEnable(GLU_MAP1_VERTEX_4)
        gluBeginCurve(nurb)
        gluNurbsCurve(nurb, uknots, cntrl, GLU_MAP1_VERTEX_4)
        gluEndCurve(nurb)
        glPopMatrix()
        glEndList()

Prashant



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Re: [PyOpenGL-Users] Nurbs curve Rendering?

[Mike C. F. <mcf...@vr...>]

Prashant Saxena wrote:
> I am trying to create a nurbs curve in 2d (no 'Z') and here is my 
> code. The curve is not getting rendered. There is something wrong with 
> this piece of code:
> Could anybody point me out?
>
> uknots= [0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0]
> cntrl = [[25, 50],
>             [25, 75],
>             [75, 75],
>             [75, 50]]
> x = 10, y = 10
> color = (0,0,0)
>            
>         """Create a GL display list to draw a Curve."""
>         nurb = gluNewNurbsRenderer()
>         glNewList(101, GL_COMPILE)
>         glPushMatrix()
>         glLineWidth(1)
>         glTranslate(x, y, 0)
>         glColor(color)
>         glEnable(GLU_MAP1_VERTEX_4)
>         gluBeginCurve(nurb)
>         gluNurbsCurve(nurb, uknots, cntrl, GLU_MAP1_VERTEX_4)
>         gluEndCurve(nurb)
>         glPopMatrix()
>         glEndList()
>
> Prashant
Don't have time to look at the code this morning, just to point out that 
there's a complete nurbs-curve demo just added to the PyOpenGL-Demo 
project's bzr repository:

http://bazaar.launchpad.net/~mcfletch/pyopengl-demo/trunk/files/2?file_id=nurbscurve-20080928050414-wwjmmaza2n95y4h9-7

which might help you.

Good luck,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
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