-extern void tube (GLfloat x1, GLfloat y1, GLfloat z1,
- GLfloat x2, GLfloat y2, GLfloat z2,
- GLfloat diameter, GLfloat cap_size,
- int faces, int smooth, int caps_p, int wire_p);
+/* Renders a tube along the line described by the two points.
+ Returns the number of polygons used.
+ */
+extern int tube (GLfloat x1, GLfloat y1, GLfloat z1,
+ GLfloat x2, GLfloat y2, GLfloat z2,
+ GLfloat diameter, GLfloat cap_size,
+ int faces, int smooth, int caps_p, int wire_p);