-extern void InitStuff_helix2(void);
-extern void DrawStuff_helix2(void);
-extern void InitStuff_helix3(void);
-extern void DrawStuff_helix3(void);
-extern void InitStuff_helix4(void);
-extern void DrawStuff_helix4(void);
-extern void InitStuff_joinoffset(void);
-extern void DrawStuff_joinoffset(void);
-extern void InitStuff_screw(void);
-extern void DrawStuff_screw(void);
-extern void InitStuff_taper(void);
-extern void DrawStuff_taper(void);
-extern void InitStuff_twistoid(void);
-extern void DrawStuff_twistoid(void);
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-