Rendering workshop - Whisky Glass

Al Hart

I appreciate this a lot, threads like these are invaluable to this rendering noob

Thanks.

I have sometimes been criticized for posting these Rendering Workshops. But I think it important to remember that there are beginners who would love to try their hand at some "simple" rendering techniques, and receive advice from the more experienced users.

Even people who delve into transparency and IOR rarely take the time to try some different settings. For example, Solo posted some IOR values to use. (Thanks Solo - I am not being critical). But there might me some other interesting things to try as well - different IOR values and/or reflection values.

notareal

A glass with liquid is a tricy target to solve for many rendering applications. A modelling quide for Kerkythea users: http://www.kerkythea.net/phpBB2/files/dielectrice_glass_modeling_normals_echo2web_129.jpg (you can find this and more tutorials at the KT forums)

I used a HDR studio with this render. A small mesh emitter is used on the right side of the glass. There is no post pro. I did let it render over night, so no idea for a good enough render time.

Kerkythea Echo 2008. Metropolis light transport (BPT). Rendertime 7 hours <a class= @i7 920." title="Kerkythea Echo 2008. Metropolis light transport (BPT). Rendertime 7 hours @i7 920." class=" img-fluid img-markdown" />

Gaieus

@drfabinex said:

I had all sorts of troubles setting up lights so I tried this render with just the standard sun settings, no lights...
...Rendered for 2h (200 passes i think) on the INTERIOR+ setting...

Interior+ in TL is actually very well fit for several light sources (either outside or indoors) so indeed it gets cleared up easier and faster when there are more light sources. My first shot in this post was about 21-22 passes (I cannot remember now exactly) and without any additional light than sun. Then the second (with the cigars) was 17 (as it says) with some additional lights (the same settings as here) and although I did a bit of PP afterwards, the raw rendering was already less noisy than the one above.

The last one was left on for some 50 passes (I watched Shrek in the meanwhile ) but that did not take as long as yours either.

Progressive rendering does indeed need sufficient lights because if there is not enough everywhere, it will remain grainy in the darker spots all the time (certainly the sun as general light should be enough for an unblocked, exterior rendering but still some more, additional ones never do any harm).

(And me, the total inexperienced newbie at rendering saying this )

Al, I will try to do those two settings. I will need to edit the scene and materials in Kerkythea for this however so may not do it right now (I still need to go back to D0me and his topic with that sliced dome tutorial)

Gaieus

@gaieus said:

...when there is the liquid, you use that material insteadof the glass material...

@unknownuser said:

@gaieus

have you tried this out on Twilight? When you mention material rather liquid, which material in particular?

Well, yes, see the images above AND - thanks Notareal for posting that tutorial (I couldn't find)!

drfabinex

Thanks for the tips Gaieus! I'll give it another shot today.

tallbridgeguy

My two cents in kerky.

Al Hart

@tallbridgeguy said:

My two cents in kerky.[attachment=0:1nsjoec9]cokeice.jpg[/attachment:1nsjoec9]

Good looking glass. The ice is a little lame (meaning not very exciting).

drfabinex

Round 2. Don't mind the terrible stock tile material I tried out on the studio floor.

17 passes (35 mins) with Twilight INTERIOR+ no pp, but a touch of light and contrast might help

no sun. 1 spotlight extremely close (actually in the shot but not rendered), 1 pointlight 10' up and 5' in front of glass.

Had some troubles getting the ice to render edge reflections properly before this pic, the variation was huge depending on where I placed the pointlight above. I tried a darker, textured studio to see if that was the problem with the whiskey reflection from my last attempt and it looks better to me.

whiskey glass 2.jpg

Gaieus

I think it's Whaat in that ice cube. He somehow smuggled himself through the skindigo exporter!
Now he'll be everywhere lik,e a trademark or logo!

Dr.Fab...
Definitely good (well, despite the bad flooring)

dale

My computer(S) really don't like these skp files, I have had nothing but problems, and a lot of crashes. Is anybody else experiencing this? On my old laptop the Kerkythea exporter refuses to even convert the file.
I was really interested in this challenge as I have always fought with glass, and water and caustics, so kept trying, then this morning after letting the file cook overnight I thought I was finally getting somewhere, I was looking at the image, made a slight adjustment to the gamma, and bingo 14hrs of rendering frozen solid.
Some interesting screenshots along the way though...

Picture 238.png

Picture 239.png

Picture 260.png

david_h

I don't partake in the Distilled Grains, Fermented Fruits or Brewed Hops.

So. . . .here's some fruit punch.

Al Hart

@unknownuser said:

I don't partake in the Distilled Grains, Fermented Fruits or Brewed Hops.

So. . . .here's some fruit punch.

Good work.

Now we need to see how to put buibbles in the liquid.

charly2008

Unfortunately, I had only Ramazotti.

david_h

What I am having a hard time with is rendering the "Whiskey" as if it were clear water. The Whiskey component always comes out dark and looks more like Coke. I have been messing around with lights, materials, alphas (which I don't understand anyway. .. .) etc.

How would i do that? Using Twilight. Any Idears out there?

Al Hart

@unknownuser said:

What I am having a hard time with is rendering the "Whiskey" as if it were clear water. The Whiskey component always comes out dark and looks more like Coke. I have been messing around with lights, materials, alphas (which I don't understand anyway. .. .) etc.

How would i do that? Using Twilight. Any Idears out there?

Many of these Whiskeys seem too dark.

Try making it a bit more transparent, and try adding some light from the side rather than the top to lightin up the Wkiskey.

Whaat

@unknownuser said:

This has been running for 38 hours.

Hey modelhead. Some things to keep in mind with Indigo:
Indigo uses physically based parameters. One of the keys for a render like this is that you have to tell Indigo what medium 'displaces' another. This is done with the 'precedence' settings. For example, we want the ice to displace the whiskey so make sure that the precedence setting for the ice is a higher number than the whiskey.

Also, when modeling a liquid in a glass, it is important that the surface of the liquid is actually 'inside' the glass. Then, you need to ensure that the glass precedence setting is higher than the whiskey so that the glass will 'displace' the whiskey.

I would lower the absorption of the whiskey using the SketchUp opacity setting as well.

Hope this makes sense.