117     ray primary, sample;  in render_one_pixel()  local
124     primary = camray(&scene, x, y);  in render_one_pixel()
125     primary.intstruct = &local_intersections;  in render_one_pixel()
126     primary.flags = RT_RAY_REGULAR;  in render_one_pixel()
129     primary.serial = serial;  in render_one_pixel()
130     primary.mbox = local_mbox;  in render_one_pixel()
131     primary.maxdist = FHUGE;  in render_one_pixel()
132     primary.scene = &scene;  in render_one_pixel()
133     col = trace(&primary);  in render_one_pixel()
135     serial = primary.serial;  in render_one_pixel()
141             sample = primary; /* copy the regular primary ray to start with */  in render_one_pixel()