Fluid in a Glass
“(and why you’ve been doing it wrong your whole life)” – an interesting read if you’re modeling fluids. This article isn’t new, but I just found it and thought it’s worth reading.
It’s hard to imagine a world without wine-glass tutorials, there are hundreds of them! Heck, I made two myself a few years ago.
But there’s a problem! We’ve been teaching (and learning) the wrong method this whole time! I know it’s a bad idea to teach complicated physics stuff in a noob tutorial, but teaching the wrong thing sounds a bit worse.
So good morning class! Today we’re going to learn about interfaces! (not that kind of interface). Open your text books to page 269 and lets find out why we’re all idiots!
Link
One thing to note, the author mentions a ray length node setup to fake volume absorbtion, which requires the first method described in the article to work properly, but in the meantime actual volumetric support was implemented in Cycles. So now it’s easiest to do the alternative method (the one from the V-Ray tutorial in the article) where the fluid and glass are modeled with fully enclosed surfaces each and slightly overlapping to avoid visual artifacts.