Author Topic: dubcats secret little hideout  (Read 107759 times)

2018-07-23, 21:29:02
Reply #225

aldola

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2018-07-23, 21:47:57
Reply #226

aldola

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2018-07-23, 23:44:51
Reply #227

dubcat

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give me a canon 5ds :p

Here is Canon 5DS RGB dump. I'm currently not 100% satisfied with my HSL dumper, will hopefully fix it next weekend.
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2018-07-24, 00:08:33
Reply #228

aldola

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2018-07-24, 15:41:51
Reply #229

aldola

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here is a test with the 5ds dump, this is the correct way to use them? may be the higlights are too strong

2018-07-24, 16:08:47
Reply #230

fabio81

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wow! very beautiful the LUT of the Canon 5dS!

2018-07-24, 17:39:14
Reply #231

dubcat

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here is a test with the 5ds dump, this is the correct way to use them? may be the higlights are too strong

I did a quick comparison against default ACES.
You have to use "Highlight Compress" 2.5 and "Filmic Highlights" 1 to match default ACES.
So leave "Filmic Highlights" at 1 and adjust "Highlight Compress" from 2.5 to taste.

edit:

I forgot to say that these settings only count for the Canon 5DS dump.
« Last Edit: 2018-07-25, 05:31:11 by dubcat »
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2018-07-25, 14:07:51
Reply #232

subpixelsk

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Hi dubcat

regarding calibrating hdris - is it neccesary to do even if I use separate light source (Corona Sun) for direct light? - for example noemotion hdris have no shadows from the sun

2018-07-25, 15:44:31
Reply #233

aldola

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Hi, i use this 

https://3dcollective.es/producto/hdri-22pack-pro/


 i think the best quality on the market, no strange tint on the colors and the have very good dinamic range.

2018-07-25, 19:44:01
Reply #234

dubcat

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regarding calibrating hdris - is it neccesary to do even if I use separate light source (Corona Sun) for direct light? - for example noemotion hdris have no shadows from the sun

Hey!

I would still adjust RGB Level to match Corona Sky values at least. Corona Sun will eat all the sky light from those low exposure HDRis.
And just to be sure, I would remove the low level sun. It will only get stronger if you adjust RGB Level.

If we combine Corona Sun and this NoEmotion HDRi without increasing the RGB Level, we won't even notice the HDRi.



If we do a quick sky calibration like this.




We can finally see the HDRi again.





------------------------------------------------------

I had a quick look at the free sample 3DCollective HDRi.

Looks like someone painted the sun with a large soft brush.
The sun value is 1079 times dimmer then Corona Sun.



Here is Corona Sun for size comparison



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2018-07-25, 20:55:35
Reply #235

Njen

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A general rule of thumb when processing HDRI's, or using something downloaded from the internet, it is important to know that at the equator, at 12pm noon, the sun is roughly 100,000 brighter than the average area of a large patch of sky. So as the sun gets lower in the horizon, the brightness of the sun decreases just a little because light has to travel through more atmosphere. And if there is any form of high level cirrus cloud, the brightness is decreased a tiny bit more too.
Please support my Kickstarter for my animated film, Cyan Eyed (rendered in Corona)!

2018-07-25, 21:13:22
Reply #236

aldola

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They are calibrated to use with the camera so 3DCollective_HDRi_022_1722_+8_4K the +8 means that you have to give +8 rgb  output amount to give the correct intensity, this one is a cloudy sky, the sunny ones have a +32 output value.

i dont know if they are correct but they give some nice shadows with the sun.

Adan martin  the creator is on the forum, so i think he can give a more correct explanation

2018-07-25, 21:32:51
Reply #237

subpixelsk

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regarding calibrating hdris - is it neccesary to do even if I use separate light source (Corona Sun) for direct light? - for example noemotion hdris have no shadows from the sun

Hey!

I would still adjust RGB Level to match Corona Sky values at least. Corona Sun will eat all the sky light from those low exposure HDRis.
And just to be sure, I would remove the low level sun. It will only get stronger if you adjust RGB Level.

If we combine Corona Sun and this NoEmotion HDRi without increasing the RGB Level, we won't even notice the HDRi.



If we do a quick sky calibration like this.




We can finally see the HDRi again.





------------------------------------------------------

I had a quick look at the free sample 3DCollective HDRi.

Looks like someone painted the sun with a large soft brush.
The sun value is 1079 times dimmer then Corona Sun.



Here is Corona Sun for size comparison





Thanks for the reply. What values did you use for sun and sky ? default size and intensity for both? sun in realistic mode? Framebuffer rule of -5,24 exposure from PG skies calibration probably doesn´t apply here or am I wrong?

2018-07-25, 21:52:49
Reply #238

dubcat

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Thanks for the reply. What values did you use for sun and sky ? default size and intensity for both? sun in realistic mode? Framebuffer rule of -5,24 exposure from PG skies calibration probably doesn´t apply here or am I wrong?

I left everything at default settings and just aligned the sun to the HDRi sun. This particular sun angle needed -5.285 EV for true albedo.
Corona Sky is a dynamic map that changes once you add a Corona Sun, and then it changes based on sun angle. I used Light Mix to isolate Corona Sky from the Sun.
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2018-07-25, 22:41:54
Reply #239

subpixelsk

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Thanks , one more question - how do you isolate sun from hdri? Output node creates a mask and then Corona mix map with black color where the sun is and sky map for the rest?

Or painting in photoshop?