57 ray camray(scenedef *scene, int x, int y) {  in camray()  argument
63     sx = (flt)scene->hres;  in camray()
64     sy = (flt)scene->vres;  in camray()
69     px = ((sx / sy) / scene->aspectratio) / scene->camzoom;  in camray()
70     py = 1.0 / scene->camzoom;  in camray()
74     projcent.x = scene->camcent.x + scene->camviewvec.x;  in camray()
75     projcent.y = scene->camcent.y + scene->camviewvec.y;  in camray()
76     projcent.z = scene->camcent.z + scene->camviewvec.z;  in camray()
82     ray1.d = scene->camrightvec;  in camray()
89     ray1.d = scene->camupvec;  in camray()
97     newray.o = scene->camcent;  in camray()
98     VSub(&projpixel, &scene->camcent, &newray.d);  in camray()
99     newray.depth = scene->raydepth;  in camray()