gluQuadricOrientation.3G man page
gluQuadricOrientation — specify inside/outside orientation for quadrics
void gluQuadricOrientation(GLUquadric* quad, GLenum orientation);
Specifies the quadrics object (created with gluNewQuadric()).
Specifies the desired orientation. Valid values are GLU_OUTSIDE and GLU_INSIDE.
gluQuadricOrientation specifies what kind of orientation is desired for quadrics rendered with quad. The orientation values are as follows:
Quadrics are drawn with normals pointing outward (the initial value).
Quadrics are drawn with normals pointing inward.
Note that the interpretation of outward and inward depends on the quadric being drawn.
gluNewQuadric(), gluQuadricDrawStyle(), gluQuadricNormals(), gluQuadricTexture()
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