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atrodler

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Reply with quote  #1 
When I render exterior scenes using HDRI lighting on a full sunny day at high sun, the rendering turns out beautifully but looks more like an ambient occlusion rending. Am I missing something in the preset settings.
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bigstick

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Reply with quote  #2 
Hi Andrew, going to need an image to comment...

Render info bar on would help.

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atrodler

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Reply with quote  #3 
right!
first image is the HDRI raw rendering.
the second is what I have normally been doing, podium physical sky.
no settings have been changed other than switching to HDRI and Using the HDRI backround.
I turn off the info bar but to get one rendered for you, I rendered the scene quickly. it's not from the attached image but probably would have showed the same info.

Like I mentioned in the previous post, I love the lighting and the quality of the rendering from the HDRI. I think the image looks extremely 3D with beautiful lighting that really shows of the volume of space. The only thing I see missing is that the sun isn't shining brightly. I had the intensity boosted to around 85% and you can see shadows but not in full sun.

HDRI render.png 
phyisical sky.jpg 
info bar.jpg


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bigstick

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Reply with quote  #4 
I suspect the reason for this is that the illumination is derived entirely from the background image. I'm guessing that if you wanted to increase the intensity of the light, you might have to adjust the original HDRI image.

It might be possible to boost the intensity of the IBL lighting, but it would take a while to look at the preset scripting. It would require an updated release though.

We have some other stuff to work on right now. Getting V2.6 out and working properly with the new licensing system has been pretty intense. It has taken time that would otherwise have been used for adding new features. That's what we are looking at doing over 2020.

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atrodler

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Reply with quote  #5 
I understand completely! This is not urgent by any means and I can always experiment in the interim. I’ve already been rendering clay versions to to see if I can pull out the shading and shadowing in PP.
Thanks for the reply.

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davew

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Reply with quote  #6 
Andrew, guys, as you no doubt already know the HDRI/ IBL light levels is entirely controlled by the Exposure slide bar in the HDRI/ IBL UI.  So sun intensity slide bar in Options/ Env has no effect.
You probably knew this but just in case. exposure.jpg 

JustinSlick

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Reply with quote  #7 
There is also huge variation in brightness / contrast depending on how the HDRI was shot and edited. 

The ones we use are from HDRI-Skies.com and have a dynamic range from 10-15 Exposure values (EV).  You can see directional shadows, but they are somewhat softer/subtler than the Podium Physical skies in a lot of cases.  Especially if the sun is partially obscured by clouds.

If you want intense sun with sharp shadows, check out some of the images from HDRI Haven -- https://hdrihaven.com/  -- these are all free with a creative commons license.

A lot of them are shot with a 26 EV dynamic range, so the sun is far far brighter than the ones that are installed with Podium.  You will need to set the Exposure slider very low, but you can get really crisp sun/shadows if that's what you're after.

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atrodler

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Reply with quote  #8 
Ah. Good to know. I’ve been thinking about it and was going to pose a question along those lines. As I mentioned, the images in podium generate beautiful images thus far. I’m just looking for that full sun in this particular instance.
I will certainly check out HDRI haven.

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Kay

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Reply with quote  #9 
Quote:
Originally Posted by JustinSlick

A lot of them are shot with a 26 EV dynamic range, so the sun is far far brighter than the ones that are installed with Podium.  You will need to set the Exposure slider very low, but you can get really crisp sun/shadows if that's what you're after.


Thanks for this info . 

HDRI Dynamic range High.png 

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