80     ray primary, sample;  in render_one_pixel()  local
87     primary = camray(&scene, x, y);  in render_one_pixel()
88     primary.intstruct = &local_intersections;  in render_one_pixel()
89     primary.flags = RT_RAY_REGULAR;  in render_one_pixel()
92     primary.serial = serial;  in render_one_pixel()
93     primary.mbox = local_mbox;  in render_one_pixel()
94     primary.maxdist = FHUGE;  in render_one_pixel()
95     primary.scene = &scene;  in render_one_pixel()
96     col = trace(&primary);  in render_one_pixel()
98     serial = primary.serial;  in render_one_pixel()
104             sample = primary; /* copy the regular primary ray to start with */  in render_one_pixel()