| OCR Text |
Show 144 due to then have just contribution We I(e,)=constant. the n/2 intensity = constant n f f bias constant lighting the could add to amount to is for net d N·L the illumination normal sense vector results same constant, The vector. This makes the the is normal ambient intensity. derived have of of = illumination constant independant perhaps cos¢ ambient direction the de constant the the of independant proper of magnitude the sin cos 0 where Thus is source 2n o = ambient is a since and we by symmetry arguments. Spot light finite about size the choose Also of then as integration the above to only angle of that spot "visible" whose center assume the but center the a the the is the of normal The is and so be the above that the I (¢). center symmetrical integration, polar axis, cP the entire the spot is function is def ine the Finally, of =0. width half the light intensity angle 4>, N to vector cP =Tf/2 plane between then spot is this For with source a distribution source. the of consider now us intensity surface. function that Let source. spot. The |
