I am trying to do a liquid simulation where the fluid is pouring into the glass but I'm not able to make the glass look realistic... Below are some examples:
Edit: Here is the .blend file
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$\begingroup$ Hello maybe try a mix between Glass, Transparent and Glossy nodes? Also the Layer Weight can be used as a Factor $\endgroup$– moonbootsJun 4 at 17:13
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$\begingroup$ Glass needs an environment to reflect. Check all of your normal directions, because it looks like that front face could be flipped. $\endgroup$– Allen SimpsonJun 4 at 17:48
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$\begingroup$ @moonboots so I guess just use two mix shaders and connect that way? $\endgroup$– prestonferryJun 5 at 2:24
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$\begingroup$ @Allen Simpson What do you mean by normal directions and front face? $\endgroup$– prestonferryJun 5 at 2:25
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$\begingroup$ @moonboots that didn't work too well... Have any idea of what I can do? Maybe I should upload the .blend file? $\endgroup$– prestonferryJun 5 at 2:44
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1 Answer
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You're doing something reasonably complicated here, and it seems like this is one of your first projects. So this might be a weird and meandering answer...
Glass is weird. There have been multiple times I have had to sanity check myself, and it's always turned out that I had just never spent that much time looking at that particular thickness of glass, or something.
Here's a picture from real life where I just couldn't believe what I was seeing in blender (a highlight reflection from both the outside and the inside of the glass), and it's the second time that such a realization made me take a picture of the light interaction so as never to forget it...
although I do seem to have lost that first photo...
What I'm trying to say with all of this is that... You made a geometrically perfect glass object and you set the camera at an exact 45 degree angle, also the background is a gray void so glass objects just look a little strange anyway. You've never seen that in real life, but I would say it's totally probable that if you did, it would actually act as you see there.
Looking at your glass, it's a thicc boi and it has an inner structure that doesn't match up with the outside.
That's not your average glass, and so it's not going to have a familiar appearance.
If we add a bevel to match the inner structure up with the outer, I think you'll find the appearance much closer.
(By the way I replaced your material with just a Principled BSDF.)
And so hopefully that's illustrative of what I was trying to say earlier, but actually we could delete all of the inner structure and use a Solidify Modifier and that makes it much easier to adjust the thickness and get the appearance you want.
I didn't rebake the simulation here, so the glass is not full, but I think you get the picture. The appearance of glass is difficult, sometimes especially in this engine, and in blender it's a combination of a lot of things.
answered Jun 6 at 23:03
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$\begingroup$ If you're really interested in glass, I have several posts on the topic, but the most comprehensive is probably this one: blender.stackexchange.com/a/219957/110840 $\endgroup$ Jun 6 at 23:05
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$\begingroup$ It isn't my first project, but it is my first liquid simulation... I've build a few houses and done simple animations... I think this might help though, I will comment on your answer if I need any tips :) $\endgroup$ Jun 7 at 5:22