I'm sorry, but that still doesn't make any sense...it's not linear? If there is a reasonable explanation for this, then good... but I'm yet to hear one?If we assume directionality of 0 = 0° rotation (aka 180° of light direction, all directions) and directionality of 1 = 90° rotation (aka 0° of direction, parallel) Then shouldn't we presume for every increment of 0.1 it should change by 9°? (that is to say, the limit of light direction is changed by 9° on both sides)Therefore a light directionality of .5 = 45° (aka half), .3 = 27° etc?I might be out of my depth here, so happy to be corrected if there is something I'm missing.
I see what you're saying but 0.1 to 0.4 almost look identical. In your reference, the difference between 0.1 and 0.4 in terms of the angle is huge