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Deviousness `anmari has been spreading her infectious positivity throughout our community for over 6 years. Throughout this time Ana has been at the core of all things devious, passionately developing an eclectic gallery, helping organise devmeets, participating in chat events and also recently completed dedicating her time as a Community Volunteer. We are absolutely delighted to bestow the Deviousness Award for May 2013 to `anmari, congratulations! Read More
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Sta.sh
The only way I can think that might make a light pattern like that is if the light source is quite close (and large), so the fall-off from distance is a stronger factor than the inclination of the plane to the light, and there'd have to be a load of ambient light. Fall-off from turning form isn't as linear as you have it here (see also figures 2 and 3 here).
Whichever way you slice it, the specular highlight is in the wrong place. (At least, I can't think of how I could light a ball such that it would make that shading with that specular highlight.) The short reason is that specular highlights are almost never in the area of full light -- they're slightly to the side, closer to us. The longer explanation is 'angle of incidence = angle of reflectance' -- in other words, specular highlights happen when the angle of the light hitting the sphere and the angle of it bouncing into your eye are the same. Figure 1 goes into more detail. Here, it looks like the light is about 60˚ up and maybe 45˚ to camera left... I did a quick plan sketch to check the angles and it seems to fit with my photographer's instinct.
Given both the specular highlight and the fall-off thing aren't quite right, maybe you're using one of the traditional methods (like Loomis)? They get it a little wrong. See figure 2.3 here for a more detailed explanation about why they're incorrect. (Also, the next page has a fun interactive diagram that shows where the specular would be for a given light direction.)
(Sorry this comment was a bit overly technical-babble-y -- I prefer to avoid using technical words, but sometimes nothing else is precise enough without being super wordy.)
thank you so much for posting this!