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Messages - bluebox

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1
General Discussion / Re: PBR shader discussion
« on: 2020-01-29, 13:11:08 »
Can't we adapt the way Arnold handles things ?
https://answers.arnoldrenderer.com/questions/2521/lambert-oren-nayar.html

Everyone would be happy being able to choose pure lambert, pure oren-nayar and anything in between.

My point asking about the shader development on the topic here was to start some sort of discussion with the Devs as to what people expect and that those more tech-guys could toss some knowledge that could be easily overlooked.
Can we hear the Dev side please ? What are you guys planning to include in the new shader ?

the Trello page says Clear Coat, Sheen, and Advanced diffuse model.

Are you a part of the development team JViz ;) ? I am familiar with trello roadmap. Advanced diffuse model can be interpreted in various ways.

2
General Discussion / Re: PBR shader discussion
« on: 2020-01-24, 14:17:52 »
Can't we adapt the way Arnold handles things ?
https://answers.arnoldrenderer.com/questions/2521/lambert-oren-nayar.html

Everyone would be happy being able to choose pure lambert, pure oren-nayar and anything in between.

My point asking about the shader development on the topic here was to start some sort of discussion with the Devs as to what people expect and that those more tech-guys could toss some knowledge that could be easily overlooked.
Can we hear the Dev side please ? What are you guys planning to include in the new shader ?

3
General Discussion / Re: PBR shader discussion
« on: 2020-01-23, 20:04:54 »
Wow, the Oren-nayar looks so much better!

Sorry, i don't get it... In my opinion / habits, Lambertian looks better here...

Can you explain why i'm wrong ?
What do you want me to explain ? I staded my subjective opinion, you stated yours. IMHO oren-nayar looks way less plastic - obviously visible in the mud exaple.
Looks also more convincint at grazing angles. Sort of like the lambertian model had kind of a black halo on 0 angle.
Hard to tell the real difference without proper testing in various conditions tho.

4
General Discussion / Re: PBR shader discussion
« on: 2020-01-16, 15:30:50 »
Wow, the Oren-nayar looks so much better!

5
General Discussion / Re: PBR shader discussion
« on: 2020-01-16, 13:46:14 »
Does this affect the amount of light transfered after the first bounce, or only the material itself ? In other words will the entire scene using this model get brighter ?

6
General Discussion / Re: PBR shader discussion
« on: 2020-01-15, 15:03:53 »
Really glad you joined the place Fluss. I really do believe that since the new material is being developed it should be as up to date tech-vise as possible so we wont wait for or ask for another overhaul in a year or so.

7
General Discussion / Re: PBR shader discussion
« on: 2020-01-14, 15:25:51 »
That will 90perc. be related to GI (particularly clamping) and Tonemapping.

But also... F-Storm doesn't have correct glossiness curve, in fact it's wrong. It can make nice looking materials, but the are absolutely not PBR :- ). Ask Johannes or Daniel, they would love to change this.
So if you're asking for even more tweaked GGX behavior, it will look just slightly bit more advanced than what Corona currently has (maybe 5perc. difference?) but absolutely not like F-Storm material.

Corona's PBR will bring different UI and parameters. It will make a creation of materials easier and more like current industry standard.

They will look absolutely the same though (with exception of Sheen parameter for fabrics). Unless they change fundamentally something under the hood for BRDF, which they could...like Lambert Diffuse is getting pretty old.

Yeah thought so that it might have something to do with Tonemapping and GI. Increasing Max ray depth and sample intensity does not affect the behaviour I'm referring to - it does not make the interior considerably brighter. Changing all materials to whites/white'ish grey overrides on the other hand does. That was the reason why I requested a simple "white override" checkbox in CoronaMtl. And why I asked if Devs are monitoring Dubcats thread quoting the energy conservation thingy.
And I know that white reflects more or the light spectrum than black does, so probably gloomy corners are more or less correct. But something seems off and I can't narrow it down to a single thing.
All in all I think that there is a general consensus that people would love to see Tonemapping and material (including the things you mention) overhaul.

8
General Discussion / Re: PBR shader discussion
« on: 2020-01-14, 13:33:36 »
just imagine how scenes will look now that the plastic feel of the materials will be gone very SOON forever

Why do you think so? There is fundamentally nothing wrong with current GGX behavior, it's been fixed long time ago. The different energy conservation loss illustrated above only applies to metals.

The PBR will bring new conveniences like Metalness workflow, coating,etc.. and hopefully Sheen for fabrics, but otherwise all materials will look exactly the same.

How so Juraj ? How the engine tells if a material is metal or not ? If you are not using any maps the difference between metals and nonmetalics is IOR. Then if want it to be glossy or not you adjust the parameter.
There is something off imho with current energy conservation in general material. When testing a dark interior painted all graphite with both Corona and Fstorm I'm under an impression that although both are dark the one in Corona appears more gloomy and darker in the corners etc. just as the Fstorm one would use some kind of white GI override to all materials.
Not sure if that has something to do with tone mapping or color space or whatever the reason. I'm by no means as technical as you or Dubcat or Fluss are so I'm just guessing here.

9
I think this was already requested but a big +1 nontheless

10
Bumping this up!

11
Gallery / Re: OZ Residence
« on: 2019-11-19, 14:06:22 »
Absolutely love it. Very photographic quality.

12
Regarding roadmap. When can we expect to see the features that will be added in v6 ?

13
Feature requests / Re: Texture Node Like Fstorm
« on: 2019-10-30, 20:51:17 »
Would love to have this.

14
Gallery / Re: Bugatti Chiron Full cgi
« on: 2019-10-21, 17:18:00 »
Love the attention to detail. Great work !

15
Feature requests / Re: Corona Converter - opacity clip
« on: 2019-10-09, 23:00:34 »
...finger?
Wow. Such usefull and constructive comment ;]. If you want to do that manually for half an hour then you're free to do so and excersize your finger. I'd rather use the converter :]

Do yourself a favor - install this script and save your *you know what* ;]

https://corona-renderer.com/forum/index.php?topic=12857.0

Thanks for taking the time Romullus, really appreciated.
I still think though that since this clip feature is kinda uniqe to Corona the native converter should give the possibility to tick it on by default.

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