The easiest way to see what this does it is to create a plane with a single spotlight shining on it, and then play with the spotlight hardness parameter to see what it does. You can either shrink it or expand it so that there is no drop-off at all. Spotlight hardness controls the fully illuminated region.That bright full illumination continues for half of the width of the cone, and then slowly drops off to nothing at the very outside of the cone. Objects near the center axis line of the cone are illuminated the most brightly.The length and width of the spotlight together do control the shape of the infinite cone in space that is illuminated by the spotlight.The brightness of the light from the spotlight remains constant, even as you move away from the tip of the cone. The cone for the spotlight represents the direction of the light, not the range of the light.Spotlights with narrower cones produce more detail than spotlights with wider cones.To move the light without changing its direction, move the dolly point (the control point at the midpoint between the cone tip and the center of the cone base).It is sometimes easier to quickly place the light and then adjust it to how you want it to be after the initial placement.
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