Porting Spheres

When porting spheres to OpenGL, keep the following points in mind:

The following table lists the IRIS GL functions for drawing spheres and their equivalent GLU functions where available.

IRIS GL Function GLU Function Meaning
sphobj gluNewQuadric Create a new sphere object.
sphfree gluDeleteQuadric Delete sphere object and free memory used.
sphdraw gluSphere Draw a sphere.
sphmode Set sphere attributes.
sphrotmatrix Control sphere orientation.
sphgnpolys Return number of polygons in current sphere.