7`XGSP!"(TTdpPP@A2eedfi>T.`   *T+ZrThe image of the rectangle is produced by projection is onto an image plane that is perpendicular to the line of sight from the viewpoint to the middle of the rectangle. As the vector from the viewpoint to one of the edges deviates from the vector to the rectangle center, it intersects the image plane at an increasingly greater distance from the image of the center.ACff W8ECC$iX0V%OX    /DZq3JdoThe bar represents the top view of a rectangle that rotates about a vertical axis through its center. Things to try: drag the red endpoint of the bar, the blue midpoint of the bar, or the viewpoint. The image can be moved by dragging the blue point. No reason not to try this in stereo. There is a bit of distortion--can you find it and explain it? BB 12/29/94 projection...can you detect it? BB 12/29/94PQ @UIxq 7 Hide Dr9 Show D  B2owCAp  A2owAAp '  y1owDC0DyC0?49 Q1owD A6 P1owAAD N1owCC@"'Co H1owCC27E8 G1owBPCr"w'6 F1owCCr1w6ww E1owBLCg l%B@ D1owCCg2l7B< C1owBPCLQ! B1owCBhm!C  ViewpointCC  '# d1ewpointAApCAp?'U s1ewpointAAD A? m!  v1ewpointCCCB?~' m1ewpointBPCCC? qw'y B k1ewpointBLCCC? fl' j1ewpointBPCCC?KQ'DP  f1ewpointCBDB? FK= D2ewpoint BAp 38=y C2ewpoint BTAp'Cv t1ewpointCC@CD6? gl>n P1ewpoint C Cgclh>R Rect half width BCruwz>v Mect half width BCrcwh>Tr Rect hf heighth BCHM?DD Kect hf heighth CCch>Q Unifm scalingth BC 2K#  e1ifm scalingthBTApBAp?' u1ifm scalingthCC@œC@? fbl  q1ifm scalingthBCC C?qbwz  p1ifm scalingthBCBC? ~bM  n1ifm scalingthBCCC?!"S  13ifm scalingth @ qqLength(Segment n) = 3.181 inches'MYQ  10ifm scalingth ?Length(Segment q) = 0.500 inches%@L 90ifm scalingth ?Length(Segment p) = 0.250 inches&< `0C<  13ifm scalingthCBA?5%F?5%F&9OV$  43ifm scalingthCCCe?5%F?5%F'*rBS  13ifm scalingthCBB?5%F?5%F%L.Q3 H2ifm scalingth CB+L QL`  G2ifm scalingth CB+! X2ifm scalingth CC,LQH Q2ifm scalingth Cz>BL-Km!  v3ifm scalingthCz>BLCC?1KQ!  n3ifm scalingthCz>BLCB?1' h1ifm scalingthCCCB?.' g1ifm scalingthCBCC?/' image planengthCCDC?]00m!  tmage planengthCCCz>BL?1<` QT  2mage planengthCz>BLA?5%F?5%F1&' rmage planengthCBCz>BL?1!UX X3age planengthCC6,8C  14age planength @ǃ>hLength(Segment v3) = 3.972 inches2L Q G3age planengthCBB3+0Q  K2age planengthCAC46 V  J2age planengthC2C56S  J1age planengthCyC67vf' w1age planengthCz@BLDofB) ?71L@QEQ R1age planength CBz9-KmEww  w3age planengthCCCBz?AKQ  p3age planengthCz>BLCBB?<1'C0 s2age planengthCyCD+B|?7? N1ge planengthC3C@ 0?UU  51ge planengthCC@A?5%F?5%F E 0  j2ge planengthCACC2C?>=J O T2ge planength CBU@8OT S2ge planength Ch$B D@8mA  u2ge planengthCCCBz?A<0`TB  32ge planengthCBzA?5%F?5%FA&KQES|  s2ge planengthCz>BLCBz?A1og{V  22ge planength  ?;@Ratio of distances to edges = 0.998 inches2B 18ge planength  ?eRatio(w3/v3) = ces to edges = 1.002 inchesB2Bd  15ge planength @5P_aLength(Segment w3) = edges = 3.980 inchesBLQ H3ge planengthCBcC' v1ge planengthC4C@C4í?$ED  14ge planengthCC@A9?5%F?5%F GQ|  R1ge planengthC4C@Q$9>S`  K1ge planengthCCJ6'GC c1ge planengthCCCBU?H\'Uͩ b1ge planengthCh$B DCC?I0'B y1ge planengthCBzDBz8?JAIT#  x1ge planengthCh$B DCBU?HIKQC@  q3ge planengthCz>BLCBc?P1 Y2ge planength CC]8RQ  X2ge planength CC"RhS' u2ge planengthCCDиC(?JT CH  Q2ge planengthCC+DUB P2ge planengthCrCVD N1ge planengthCC@ 0Tww  w1ge planengthCC@C4C@?S >S<  n1ge planengthCCCyC??TNRSWCb V1ge planength CBWKI.N3Cb U1ge planength C#BWKLQT J3ge planengthC~7BtYDt  t2ge planengthCrCCC+?]^U  T1ge planength C3C@`FUU  61ge planengthCC@A?5%F?5%F _' x1ge planengthCC@Cí?$_' q1ge planengthCCCB?b'S( p1ge planengthC#BCC?cH-SWxB  z1ge planengthC#BCB?bcJT 18ge planengthCz>BL@?5%F?5%F1dD|  15ge planengthC3C@Ap6?5%F?5%Ffe' b2ge planengthC4C@C4í?$fL(  T2ge planengthCC@$h+0dd S2ge planengthCNC-\jGL R2ge planengthCCdi\HM M3ge planength Cyo?B7l A3ge planength C4C"nmC0  Z2ge planength C4C]nm'  x2ge planengthCC@CC@?o *LU(  v2ge planengthCNC-CCd?qp  u3ge planengthC4C]C4C"?st  j3ge planengthC4C"C3C@?fsR  U2ge planength CC@ugV  D3ge planengthC4C1xxS  16ge planengthCC@AC?5%F?5%Fyv'U(  y2ge planengthCC@Cí?$y  k3ge planengthC4C"C4C1x?zsߎ C3ge planength CC"|{H B3ge planength CC]h|{  t3ge planengthCC]hC4C]?t  s3ge planengthCC"CC]h?~  r3ge planengthC4C"CC"?~s E3ge planengthC4C*5z}|g/T4  23ge planength  ?"Ratio of image heights of edges = 0.998 incheswQX  16ge planength  ?Ratio(u3/s3) = heights of edges = 1.002 incheswyT  12ge planength ?x8Length(Segment s3) = s of edges = 0.806 incheslxU  11ge planength ?}'qʙLength(Segment r3) = s of edges = 0.807 inchesT  m3ge planengthC4C*5zC4C"?sOvb  Hidee planength  7?:JTA6MObv  Expl distortion  7?:JTA6Mr 9  Hide distortion  ON;*)(p8  Show distortion  7\ON;*)( F3ow distortionC4C&nH  Hide distortion  !'"& %[nx  Text & cntrolsn  !'"& % 17xt & cntrolsnC4C"@hp@?5%F?5%Fs8= L3xt & cntrolsn CkBgDBGC`  K3xt & cntrolsn CQB D(:B2J7