odf opened this issue on Oct 27, 2008 ยท 13981 posts
bagginsbill posted Tue, 08 September 2009 at 10:38 AM
I'm confused by the occasional phrase of the form "If one could implement a realistic refraction in Poser".
I did that with Antonia's eye a few pages back, and showed how you can see the iris even though it is concave, when viewed from the side, with real refraction applied.
The problem isn't that we don't have refraction. Keep reading from there. The problem is we can't get the iris properly lit behind the refractive cornea. Poser doesn't allow lighting to pass through a refractive surface. I don't need it to bend, ala caustics, I just need it to get through!
I have an experimental shader that combines transparency (to allow light through) and refraction (to bend what we see) and a negative luminance refraction (to remove the unbent image of the iris we see because of the transparency). But this shader is damn tricky to tune.
Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)