Didn’t get an answer in the last thread, only found out what wouldn’t work. So let me rephrase the question:
How can I drive a change by how much light lands on a SMALL AREA ONLY? Not the whole scene, which seems to be what surface luminance does, but a very limited area.
For example, incandescency map on ears (to fake sss look) rises in intensity as the light that hits a small ‘photosensitive’ surface behind the ear increases. As shadow falls across the smaller surface, the sss fake effect disappears from the ears. It seems it would be simple for Maya or MR… Possible with Surface Luminance? Possible at all?
edit: or maybe LightInfo can be used somehow to get the direction of the light at least, not as good but better than nothing… can’t leave it to the poor animator to guess when light is shining on the back of the ears and not… (and real sss, well I’m not so happy with it for skin yet…)