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python-2.7pyopengl

Error with PyOpenGL and glutSolidCylinder

I'm attempting to draw a solid cylinder using PyOpenGL (along with PyODE), however I am met with the following error:

OpenGL.error.NullFunctionError: Attempt to call an undefined function glutSolidCylinder, check for bool(glutSolidCylinder) before calling

I have the following three imports, and have been using other glut* calls (glutSolidSphere, glutSolidCube, etc) with no issue, but this one causes me problems.

from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GLUT import *
...
glutSolidCylinder(RADIUS, LENGTH, SLICES, STACKS)

I'm using Python 2.7, and when I test with print(bool(glutSolidCylinder)) I receive False.

I'd used Pip to install PyOpenGL as well.

Solution

  • The original GLUT implementation doesn't have cylinder functions, but freeglut does (source), (then, Python 2.7.1, PyOpenGL 3.0.1 with FreeGLUT 2.6.0 together work well on Ubuntu 12.04).

    However, you can make a cylinder also with GLU functions, in Python:

    quadratic = gluNewQuadric()
gluCylinder(quadratic, BASE, TOP, HEIGHT, SLICES, STACKS)      # to draw the lateral parts of the cylinder;
gluDisk(quadratic, INNER_RADIUS, OUTER_RADIUS, SLICES, LOOPS)  # call this two times in the appropriate environment to draw the top and bottom part of the cylinder with INNER_RADIUS=0.