| OCR Text |
Show 93 30 Figure The perpendicular directon plane Normal (X to Y Scan onto Z) Plane in lying the scan is (x This must be z) Y scaled x p the to M projected (y2+Z2 = components sideways T = the (x N p S = N . M z) Y = N X Xn X M . Y Z) yielding -Xz) -XY n the called eye, S. + into resolved then called eye, (X as ly2+Z2 toward pointing from is normal length same / The of Projection - These Y Yn + (y2+Z2) two pointing as Zn Yn - and T, defined are Z the X Y - Zn X Z p / The value of perpendicular is T to silhouette edges. (0,0,0) and whenever zero the scan Both T whenever Iy2+Z2 and the ray S (in will normal the 3 be normal vector is i.e. at dimensions), zero vector at (Xn the Yn eyepoint Zn) is |
