21 Space *pushmat(Space *t){  in pushmat()
33 Space *popmat(Space *t){  in popmat()
40 void rot(Space *t, double theta, int axis){  in rot()
56 void qrot(Space *t, Quaternion q){  in qrot()
63 void scale(Space *t, double x, double y, double z){  in scale()
75 void move(Space *t, double x, double y, double z){  in move()
87 void xform(Space *t, Matrix m){  in xform()
92 void ixform(Space *t, Matrix m, Matrix inv){  in ixform()
104 void look(Space *t, Point3 e, Point3 l, Point3 u){  in look()
127 int persp(Space *t, double fov, double n, double f){  in persp()
151 void viewport(Space *t, Rectangle r, double aspect){  in viewport()