Chaos Corona Forum
Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: jrcenator on 2013-06-04, 08:37:22
-
Hi, I just wanna know, what is the correct workflow in Corona while using HDRI for it's lightsource?
Usually what I do is: assign HDR in environment slot, tes render, adjust the exposure & highlight in post tab then add sun and adjust its multiplier to match the light before.
Any suggestion is most welcome, thanks before.
ps. sorry for my english
-
I guess there's nothing special there. But if you also have vray, you can use also vrayhdri map, as it is supported by corona, to have some more control over hdri map if you need to adjust gamma and exposure of hdri itself...
Also coronaportal material on planes covering windows might speed things up if you're using hdri to light interior (just remember to keep as few portals as possible and they should be ideally just single polygon planes... I think..)
-
Hi Lacilaci, thank you for your reply. Currently I'm doing lots of exterior render (which the result I'm not really proud of :( ).
I just feel that my light not "real" enough, maybe I just post the raw render here and ask for suggestion also :D
-
there is really no way you could screw up HDRI rendering (i mean incorrect shadows, intensity, gi ...)
-
@Lacilaci & Keymaster: this is my raw render using HDR and corona sun. As you can see, its kinda dull.
Maybe you can give some suggestion here. I'm kinda stuck here T.T
-
Why would you use corona sun when it's an HDRI?
-
Why would you use corona sun when it's an HDRI?
umm to achieve the strong shadow. Did I do something wrong here?
-
It looks like the sky is uniform so there are no visible shadows or shading. Maybe it's because of the HDRI you're using. Can you show it? If you want to keep it, try changing contrast between the HDR skylight and sun, for example use lower intensity of HDR and stronger sun.
-
It looks like your hdri is lighting your scene almost equally from all sides, I guess you could achieve the same lighting using a single color as environment lighting..
As rawa said try to avoid sun, instead use photoshop or if you have vray then vrayhdri and play with gamma and exposure settings for hdri itself to get more contrast. This will give you hard shadows and some variations in lighting...
If it fails, try different hdri or you might also try corona sky + sun...
-
@Lacilaci & Keymaster: this is my raw render using HDR and corona sun. As you can see, its kinda dull.
Maybe you can give some suggestion here. I'm kinda stuck here T.T
You just have to tweak the input image itself, it is virtually impossible to get anything else than the single correct unbiased result from Corona in this situation
-
It looks like the sky is uniform so there are no visible shadows or shading. Maybe it's because of the HDRI you're using. Can you show it? If you want to keep it, try changing contrast between the HDR skylight and sun, for example use lower intensity of HDR and stronger sun.
Here it is the jpg version of the HDR that I used
It looks like your hdri is lighting your scene almost equally from all sides, I guess you could achieve the same lighting using a single color as environment lighting..
As rawa said try to avoid sun, instead use photoshop or if you have vray then vrayhdri and play with gamma and exposure settings for hdri itself to get more contrast. This will give you hard shadows and some variations in lighting...
If it fails, try different hdri or you might also try corona sky + sun...
@Lacilaci & Keymaster: this is my raw render using HDR and corona sun. As you can see, its kinda dull.
Maybe you can give some suggestion here. I'm kinda stuck here T.T
You just have to tweak the input image itself, it is virtually impossible to get anything else than the single correct unbiased result from Corona in this situation
hmmm its looks like I need to tweak within the HDR image itself. I'll give vrayhdri a shot :), looks like it's got more setting.
Thank you very much for everyone respond here :D
-
If it's HDRI, then it means data about environment lighting situation is already there, so if you want your lighting look as it was intended by the creator of the Map, then do not mix it up with anything else. Corona can sample HDRI maps well, so if there is a strong sun spot on your HDRI map, you will get those nice crisp shadows.
When opening HDR files, always make sure you set them to 32bit and def. exposure when opening.
-
If it's HDRI, then it means data about environment lighting situation is already there, so if you want your lighting look as it was intended by the creator of the Map, then do not mix it up with anything else. Corona can sample HDRI maps well, so if there is a strong sun spot on your HDRI map, you will get those nice crisp shadows.
When opening HDR files, always make sure you set them to 32bit and def. exposure when opening.
Hi thanks for the respond, Rawa. I will experimenting again with HDR light (without sun this time ;)).
I will post the result again here.
Thank you very much
-
Hiya, this is my updated result. I changed the HDR file, remove the sun and still without postpro.
I also included my render without material so only the raw light is visible.
Any comment and suggestion is much appreciated
-
Here render using HDRi quickly to the test. In a scene no lights at all.
And screenshots settings hdri. Sometimes setting flies in the bitmap itself.
-
Wow, really nice. Do you by any chance can show me what your HDR image looks like?
Thanks :)
-
http://www.aversis.be/tutorials/vray/vray-high-dynamic-range-hdri.htm (http://www.aversis.be/tutorials/vray/vray-high-dynamic-range-hdri.htm)
strongly recommend to read this before further experiments
if your hdri looks too dark in material editor try to set its gamma to 2,2
if hdri colors look unsaturated (whitsh) then you shoud try 0.454 as gamma
And i would recommend using camera exposure instead of changing hdr multiplyer
-
Hi, thanks Jahman. It's really good reading and nice tips there :). Looks like I need lots of experimenting (also in my material setting, I realize it's really bad).
Anyway, thank you very much for all of you :D
-
Here's a rather unremarkable HDRI map used. This is of course a simplified version of the picture.
-
Wow, it is a really nice HDRI. The sun/shadow is sharp and had lots of natural color. Really helpful man :D Thank you
-
I can only confirm CG-Source is over-the-top best HDRi on the market. Both the fully sphericals like above, and the separate hemispherical Skies.
The resolution (16000px + !), clarity, dynamic range, is so far ahead from anything else there is, even much better than P Guthries's one.
-
How about the one from Hyperfocal? they had 2nd series with skies that looks nice
-
2nd Skies series aren't HDRi, they're just hemispherical jpegs. They're HDRis on other hand are bit old and dated, they claim some of them go up to 16stops in range...but I haven't been impressed at all. They're 10k, which is more than PG, but more blurrier, taken with older dslrs. The CG-Source are taken by the guy running hdri-locations, Thomas Suurland, and it's different league in quality to all other on market.
Trust me, I've bought most of PG skies, even 2 full collections of Dutch Skies, which are used in every Hollywood blockbusters..but for pure archviz lightning, the quality you get in Cg_Source (16k of super sharp, broad range of EVs) can't be outmatched. No gamma tweaking necessary at all to boost contrast (like you would do with PG's hdri).
-
You really tempting me with CG-source HDRI ;).
Maybe I try to get one and run it with my scene. Also your render for Paris apt in gallery section using HDR from cg-source?
-
Hi everyone, instead of starting a new thread I thought my query would be more relevant posted here.
I am looking for a workaround of the burned sky when using HDRI as the only light source in interior renders.
Highlight compression can't seem to fix this to full extent. I attach screen grab - all default settings, map loaded through VrayHDRI in Corona Environment tab.
https://www.dropbox.com/s/dcarod8x0483u17/Screenshot_3.png
Thanks for your time!
Peter
-
There are several methods.
1. use direct visibility override in corona settings>enviroment
2. save as 32bit file and use local tone mapper.
3. save alpha channel and replace sky in post.
4...
-
There are several methods.
1. use direct visibility override in corona settings>enviroment
2. save as 32bit file and use local tone mapper.
3. save alpha channel and replace sky in post.
4...
Brilliant! #1 was exactly what I was looking for - control and positional accuracy. Thank you!
-
I feel a bit stupid to ask this - but ...
Why do most people use that Vray power shader to load HDRI-files?
Normal "Bitmap" is not good enough in 3ds max?
Are there any advantages using that from Vray?
-
I can only confirm CG-Source is over-the-top best HDRi on the market. Both the fully sphericals like above, and the separate hemispherical Skies.
The resolution (16000px + !), clarity, dynamic range, is so far ahead from anything else there is, even much better than P Guthries's one.
Is it really that much of a difference over PG's quality? I have bought quite some PG skies for my renders but I have never tried CG-Source ones. Really tempting now..
-
I feel a bit stupid to ask this - but ...
Why do most people use that Vray power shader to load HDRI-files?
Normal "Bitmap" is not good enough in 3ds max?
Are there any advantages using that from Vray?
I get better sky quality in my renders while loading through V-Ray HDR Loader and the controls are better.
-
Max's native HDRI loader is the ancient Splutterfish one by Cuneyt Ozdas, unless they have changed it recently.
-
Excluding the Vray, there is any alternative to the bitmap method?
-
I get better sky quality in my renders while loading through V-Ray HDR Loader and the controls are better.
Pictures or it didn't happen ;]
Seriously, i would love to see difference in sky quality between native and vray loaders.
-
Pictures or it didn't happen ;]
Seriously, i would love to see difference in sky quality between native and vray loaders.
Well, when I use standard 3dsmax bitmap loader HDR sky seems a bit pixelated in high resolution renders. Through V-Ray loader it always looks good, dunno why. I will try to grab some screenshots for comparison.
-
Can the loader be downloaded from somewhere or do I need to install Vray demo?
-
You need to install Vray demo