Naloge delavcev se izracunavajo po pasovih v obsegu, kot ga ukaze upravitelj.
static char *
* calc_tile (y1, y2)
* int y1, y2;
* {
* PixelMap = (char *)malloc ((y2 - y1) * width * 3);
First_Line = y1;
* Last_Line = y2;
Start_Tracing ();
return PixelMap;
* }