Starts the definition of a new polygon. Each subsequent move while the turtle's pen is down results in the destination coordinate being added as a vertex to the polygon. The polygon's definition is completed by running the POLYEND command.
Make sure you understand the Polygon Restrictions.
After all of the polygons are defined, you can view them as shaded polygons by running the POLYVIEW command.
POLYSTART is designed to run in PERSPECTIVE mode and does not run in 2D modes.
TO SQUARE POLYSTART REPEAT 4 [FORWARD 100 RIGHT 90] POLYEND END PERSPECTIVE REPEAT 72 [SQUARE RIGHTROLL 5] POLYVIEW