Haa, thanks ! It works fine ! :) I have solved myself the problem by an other way :float $camFoc[3] = `camera -q -worldCenterOfInterest persp`; float $camPos[3] = `camera -q -position persp`; vector $one = <<$camFoc[0], $camFoc[1], $camFoc[2]>>; vector $two = <<$camPos[0], $camPos[1], $camPos[2]>>; vector $final = ($two -…