Quadrics are various smooth surfaces that can be described by the generic quadratic equation:
a1 x2 + a2 y2 + a3 z2 + a4 xy + a5 yz + a6 xz + a7 x + a8 y + a9 z + a10 = 0
The basic quadric shapes are spheres, cylinders, cones, and disks.
To draw a quadric, create a "quadric object" and then pass it to the appropriate GLU function. There are functions to control how a quadric is drawn - with points, lines, or polygons; with or without lighting; with or without texturing.
quadric = gluNewQuadric() gluQuadricDrawStyle(quadric, GLU_LINE) gluSphere(quadric, 2.5, 32, 24)
Example code: gluQuadrics.py
| Sphere | gluSphere(quadric, radius, slices, stacks) |
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| Cylinder | gluCylinder(quadric, baseRadius, topRadius, height, slices, stacks) |
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| (a cone is a cylinder with one radius = 0) | ||
| Disk | gluDisk(quadric, innerRadius, outerRadius, slices, rings) |
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| Partial Disk | gluPartialDisk(quadric, innerRadius, outerRadius, slices, rings, startAngle, sweepAngle) |
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