This patch will affect rtarea. It will now inform the presented and exposed region areas center points.
Created a structure to hold points (struct point_list);
Added to structure area, two struct point_lists to hold presented and exposed points;
Implemented recording of points in rayhit();
Implemented freeing of such points in view_end();
Added area_center() function. Prototype:
void area_center(struct point_list * ptlist, int number, point_t * center)
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