95     ray primary, sample;  in render_one_pixel()  local
102     primary = camray(&scene, x, y);  in render_one_pixel()
103     primary.intstruct = &local_intersections;  in render_one_pixel()
104     primary.flags = RT_RAY_REGULAR;  in render_one_pixel()
107     primary.serial = serial;  in render_one_pixel()
108     primary.mbox = local_mbox;  in render_one_pixel()
109     primary.maxdist = FHUGE;  in render_one_pixel()
110     primary.scene = &scene;  in render_one_pixel()
111     col = trace(&primary);  in render_one_pixel()
113     serial = primary.serial;  in render_one_pixel()
119             sample = primary; /* copy the regular primary ray to start with */  in render_one_pixel()