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Vue F.A.Q (Last Updated: 2025 Jan 24 7:34 pm)



Subject: Getting HDRI to work well...


RyanSpaulding ( ) posted Wed, 19 July 2006 at 2:45 PM · edited Mon, 20 January 2025 at 5:04 PM

Attached Link: Here is the image and breakdown

Hey guys,

I'm trying to see if I can get HDRI to produce good results on outdoor exteriors.  I took the plunge and bought Dosch's HDRI skies so that I was ensured I wasn't getting bad HDRI's.

I have little to no experience with HDRI.  I've been using GI on this one project and am trying for something a little more 'real'.  I posted (below) an image comparing the results...and was curious if anyone can help out.

The hdri version looks blotchy, dark, and I cant tell how to place the sunlight from a particular angle.  I'm guessing that the blotchiness has to do with -1.0 GI...but should I still use GI? Or up to Radiosity?  Tips and help needed fellas.  Help is MUCH appreciated.

I'd have more time to tweak, but the deadline is approaching fast...

 

-Ryan Spaulding
 VueRealism.Com


bruno021 ( ) posted Wed, 19 July 2006 at 4:05 PM

You can change the exposure and contrast of your HDR file in the atmosphere editor. Place the Vue sun according to the light in your HDR ( check the shadows direction). You can also move your HDR image (offset  map)in both vertical and horizontal axis , to get a nicer light on your plants or on the part you want highlighted in your render, or to make the sky higher or lower ( good for clouds).

Now about the "blotchy" shadows, I have to agree, check this link:

http://excalibur.renderosity.com/mod/gallery/index.php?image_id=1192741&member

I tried bumping up the GI quality to +1, but it didn't change anything. And nobody seems to see what I mean either!



bobbystahr ( ) posted Wed, 19 July 2006 at 6:42 PM

I can't remember and since the demo stopped workin I can't check, but doesn't an HDRI create shadows from the map as well as the VueSun, in the form of leaf shadows, etc....I think I worked around it by deleting the VueSun entirely and controling the whole scene light by tweaking the environtment map...brighter, often, and more contrast seemed to help sometimes...IIRC

 

Once in a while I look around,
I see a sound
and try to write it down
Sometimes they come out very soft
Tinkling light sound
The Sun comes up again



 

 

 

 

 


chippwalters ( ) posted Thu, 20 July 2006 at 2:09 AM

Couple of ideas, if you want the blotchiness to go away, I would suggest jacking up your quality boost level for GI. Try it on a small test area and see if it doesn't work. I might also try adding a bit more of the sun in order to get some harsher shadows (set the softness of the sun to something like 3 to 5).

Lastly, I'm not sure HDRI is all that great for outdoor scenes, as the shadows are generally very soft as in an overcast sky type of setting. I would take a look at Erka's Bauhaus demo scene and see how his atmosphere is set up. I've learned a lot by studying his scenes.

best,

Chipp

 


chippwalters ( ) posted Thu, 20 July 2006 at 3:04 AM

Here are a few test renderings using the default sky HDRI which comes with Vue.
This first one uses absolutely no direct sunlight (Light Balance = 0%). You can see there are no real shadows to speak of.

In the second image, I've aligned the sun with the HDRI and set the Light Balance to 20%. Also, the light itself was set with a 5 degree softness factor which helps soft shadows. You can see a faint shadow on the vertical surface as well as on the ground.

The last image had the Light Balance set to 30%. The shadows are a bit more pronounced. I like it even more.

Hope this helps.

 


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