Liquids Test Thread

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Whaat
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Liquids Test Thread

Post by Whaat » Mon Jul 06, 2009 1:30 pm

First up:
Milk(reduced) from the Indigo Manual. I rendered this to something like 14,000spp and then i realized that I did not have the proper phase function settings. It was set to Uniform instead of Henyey-Greenstein. However, when I started the render again using HG, the results seemed to be nearly identical, except for more bright blotches that cleared extremely slowly. I abandoned the HG render because I thought the result using Uniform phase function turned about pretty decent.

Feel free to post your own liquid tests, but please make sure the following:
- The scene is modelled real-world scale
- Liquids in glasses are modelled as shown in the Indigo Manual with correct precedence settings
- Please share your material settings
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milk.png
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Last edited by Whaat on Tue Jul 07, 2009 9:45 am, edited 1 time in total.

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Whaat
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Re: Liquids Test Thread

Post by Whaat » Mon Jul 06, 2009 1:39 pm

Coke from the Indigo Manual:
Seems a tad dark to me. Might look better with ice cubes and some fizz bubbles.

All renders tests done with Indigo 2.0.X Bidirectional MLT unless noted otherwise.
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coke.png
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Nick
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Re: Liquids Test Thread

Post by Nick » Mon Jul 06, 2009 7:47 pm

Beautiful materials Whaat, but the milk seems to paint white!!!! xDD


I like coke! Thank you :)

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Borgleader
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Re: Liquids Test Thread

Post by Borgleader » Mon Jul 06, 2009 8:17 pm

Nice but, like said above the milk somewhat does look like paint, also the coke is wayyyyy too dark. I drink a ton of it ;)

Also why is the milk faceted where as the coke isnt?
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Stur
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Re: Liquids Test Thread

Post by Stur » Mon Jul 06, 2009 9:50 pm

Because he probably realised, after having rendered the milk, that he had forgot to push the "smooth" button :P

Same remarks as above, the milk looks like paint and the coke is a bit dark. Is your scene scaled correctly ?

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suvakas
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Re: Liquids Test Thread

Post by suvakas » Tue Jul 07, 2009 7:15 am

I've also been playing with some SSS liquids lately. Wanted to try out the orange juice material Whaat made. I hope you don't mind me posting my tests here too?

The 1st img is Whaat's juice mat. Works very good I think!! Thanks Whaat!
And the 2nd is my try on low fat milk from Indigo's manual. I tweaked the sss values a bit for it.
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orangejuice.jpg
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milk.jpg
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Borgleader
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Re: Liquids Test Thread

Post by Borgleader » Tue Jul 07, 2009 7:45 am

Call me paranoid but I see facets on your too :(
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suvakas
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Re: Liquids Test Thread

Post by suvakas » Tue Jul 07, 2009 7:59 am

Borgleader wrote:Call me paranoid but I see facets on your too :(
True. I see them too. I wonder if it could be SSS related thing?

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Re: Liquids Test Thread

Post by Stromberg » Tue Jul 07, 2009 8:13 am

Great juice :)
And i see the facets to :cry:
I was trying to make milk myself one day, but the rainbows from sss made my almost go mad :P

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Whaat
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Re: Liquids Test Thread

Post by Whaat » Tue Jul 07, 2009 8:22 am

suvakas wrote:
Borgleader wrote:Call me paranoid but I see facets on your too :(
True. I see them too. I wonder if it could be SSS related thing?
I am 99% sure my meshes were smoothed. I think it could be a bug with SSS. Liquids with small SSS values are not showing this faceting for me.

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Re: Liquids Test Thread

Post by Borgleader » Tue Jul 07, 2009 9:28 am

I can't see them on the orange juice so I guess you're right it could be a problem with the SSS behavior.
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Whaat
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Re: Liquids Test Thread

Post by Whaat » Tue Jul 07, 2009 2:18 pm

Another render of my juice material. Not sure why it's blackish around the meniscus. This is apparent on suvakas' render too :?
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orange_juice_in glass.png
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Re: Liquids Test Thread

Post by Borgleader » Tue Jul 07, 2009 2:33 pm

Tbh i think its normal. At that spot the "juice" is very thin and clearer, and so the black comes from the joining of the clear "water" and the glass kind of like the top of the glass. Or at least I think so.

Not sure my post made sense but,,,
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Whaat
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Re: Liquids Test Thread

Post by Whaat » Tue Jul 07, 2009 3:03 pm

Watered down wine:
These tests compare Merlot wine renders at various concentrations (diluted in water) to the renders in the Jensen paper. Although the renders are similar, it is clear that the Indigo renders seem to absorb more. The Indigo parameters are from the Indigo manual (converted from the Jensen paper). I am quite certain the values in the Indigo manual are correct. I checked them several times. Is it possible that Indigo is not calculating absorption correctly?
Attachments
merlot_ref_0.25.jpg
Jensen 25% Merlot
merlot_ref_0.25.jpg (16.8 KiB) Viewed 5753 times
Merlot_0.25.png
Indigo 25% Merlot
Merlot_0.25.png (300.07 KiB) Viewed 5759 times
merlot_ref_0.125.jpg
Jensen 12.5% Merlot
merlot_ref_0.125.jpg (16.96 KiB) Viewed 5742 times
Merlot_0.125.png
Indigo 12.5% Merlot
Merlot_0.125.png (293.1 KiB) Viewed 5753 times
merlot_ref_0.03.jpg
Jensen 3% Merlot
merlot_ref_0.03.jpg (16.77 KiB) Viewed 5732 times
Merlot_0.03.png
Indigo 3% Merlot
Merlot_0.03.png (323.47 KiB) Viewed 5739 times

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Re: Liquids Test Thread

Post by OnoSendai » Tue Jul 07, 2009 4:54 pm

Yeah, there's something incorrect somewhere.

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