53.33333 double FOV=180.0*2.0 * Math.atan(1.0/(focus * 2))/Math.PI; tan(pi*fov/360)=size/2f size=2f*tan(pi*fov/360) 44.155 focal pour 45°=43,456 (3ds=53.333332) ==> with 3ds 44.1828