Why in the first picture the brightness seems to be identical in the central circle? The picture looks like the light starts decaying only outside that circle.
emmaloool
@Osoii In the first picture I think the point light source is located in the ground, and we pull it away from the ground then because of the quadratic fallof, the lighting will get dimmer faster. It might look a little unnatural at the point light source, but I think it looks a little jarring (i.e., fallof is not smoothly linear) because of the quadratic relationship between the ratio of the irradiances of the two concentric spheres and the distances from their centers (i.e., radii).
Why in the first picture the brightness seems to be identical in the central circle? The picture looks like the light starts decaying only outside that circle.
@Osoii In the first picture I think the point light source is located in the ground, and we pull it away from the ground then because of the quadratic fallof, the lighting will get dimmer faster. It might look a little unnatural at the point light source, but I think it looks a little jarring (i.e., fallof is not smoothly linear) because of the quadratic relationship between the ratio of the irradiances of the two concentric spheres and the distances from their centers (i.e., radii).