At all I'm not a GLUT specialist. I'd give you the advice to ask in a OpenGL related forum. I'm sure you will get a faster and better answer in quality.
First I'd say to Zoom a scene glScale would be a good idea.
Here a link to an OpenGL forum:
Best regards
Bordon
Note: Posted code pieces may not have a good programming style and may not perfect. It is also possible that they do not work in all situations. Code pieces are only indended to explain something particualar.