Scaling down environment maps in iray?
Pleblu
Posts: 32
I've included an album with screenshots of what I'm talking about here: http://imgur.com/a/Xh0wm#4
The first picture shows how insanely large the HDRI I'm using is compared to the model. In this, I'm using the default infinite sphere.
I read on the main thread to try finite sphere, as it gives more options. The second picture shows that turned on with the sliders set to 0.
Third image is the radius scaled down into the negatives
Fourth image shows the scale multiplier scaled down.
Fifth image shows them both scaled down with a change in color with the map.
None of them have any effect on the map that I can see aside from the color change at the end. What do these actually do?
The main question, is scaling down the enviro map possible yet? If so which setting is it? I'm certainly baffled.
I'm using footprint court from this site: http://www.hdrlabs.com/sibl/archive.html
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Are you sure that the map is the correct projection for use on the dome?
I'm sorry, I don't know what that means. I've not worked with HDRI's a lot in the past but am finding they work super well with iray. I thought I knew how they worked, but maybe not.
Where is the map from?
I linked it in the original post: http://www.hdrlabs.com/sibl/archive.html
Those are in LatLong format - they are opened out along the equator, so the scene still rads from left to right as you look at the image. As far as I know that isn't a format Iray, at least in DS, uses so you can't use those maps without converting them.
What format does Iray DS use?
Spherical, I think - though there are two variants on that and I can never remember which is correct. You can use the TDL Make utility to convert, as I recall, or there are various other tools around.
So DAZ 3delight uses the LonLat and Iray uses one of the spherical maps? What a pia.
As far as I know both use spherical.
load a HDRI click on the small thumb and chose the Image Editor...bobs your uncle. :)
PS for the record I used one of their HDRI's, Chelsea Stairs for this http://www.daz3d.com/gallery/#images/62572
Ah, thank you - I think I had seen that before, but had totally forgotten it.
my pleasure Richard
Ok. I have worried all day I was loosing my mind because I was sure it was lonlat for ue2.. And per the docs from Omnifreaker "The map must be in Lat/Long (or latitude/longitude) format. "
3Delight doesn't really care what they are ...spherical, latlong, or cube. Yes, it still needs to be told, somewhere, what they are, but it can handle all three formats.
It would really surprise me that Iray couldn't understand latlong maps, because almost every other renderer I can think of does...
Changing it to lat long didn't do anything.
The map is positioned just fine, it's just overly large. I just wanted to know if scaling it down was an option, and which options in the enviro setting I would use to scale it down. Scale multiplier? Dome radius? None of them?
If it's the format preventing me from scaling does anyone have any suggestions on where I would get the proper format?
Has anyone else had success scaling a HDRI in IRay? Which maps did you use?
oh yeah sorry about that I didn't check that part of the question. I just tried to find out how to do it myself and came up empty. I have no idea how to scale a HDRI as every option I choose I get the same sized HDRI rendering.
Is it really that huge? The foo dogs are big, but other elements look quite reasonable against a figure.
It may be that the camera needs adjusting to match the camera used to take the image, though I'm not sure how great a factor that is with domes rather than flat back-plates.
Try setting the Dome Mode to Finite Sphere w/ground, then scale down Dome Scale Multiplier towards 1.0
or without ground if your getting distortions.
In the album I linked It shows what happens when I try to do this.
What HDRI are you using? Would you mind linking? If you've successfully scaled down the image I'm very interested in getting ahold of the file to see if the issues on my end or not.
I used the Old Industrial Hall from the link http://www.hdrlabs.com/sibl/archive.html. But I just noticed I think I used the fin4_Ref.exr file.
Set the dome mode to finite sphere and the Dome scale multiplier to 5.
Another one that worked fairly well is the Chiricahua_NarrowPath NarrowPath_3k.hdr (same settings as above)
Also I find adjusting the Cameras Focal Length helps too.
Be careful that you are rendering your main screen not the Auxiliary view, by clicking the main screen before rendering.
The renders aren't 100% there is a bit of light flash or distortion so I might be leading you completely up the wrong path :( but may help.
I tried the http://www.hdri-hub.com/hdrishop/freesamples/freehdri/item/323-hdr-city-road-night-lights-free and this seem to work quite well on default settings, tho again the image suffered a little light flare and Camera focal length could improve views a little.
It was the AUX vs Main screen that was doing it which is odd in my opinion. I'm not sure why that's making a difference. They may want to change it in the future as it's a bit confusing.
However multiplier is still making the HDRI coloring distorted. The background image is turning green, which isn't showing up on the model. The model is still being lit by the correct coloring from the original image. Is this a mis-setting on my part or a beta issue? SY was getting this issue as well.
It was the AUX vs Main screen that was doing it which is odd in my opinion. I'm not sure why that's making a difference. They may want to change it in the future as it's a bit confusing.
However multiplier is still making the HDRI coloring distorted. The background image is turning green, which isn't showing up on the model. The model is still being lit by the correct coloring from the original image. Is this a mis-setting on my part or a beta issue? SY was getting this issue as well.Do you have Visualize Finite Dome set to On? That will cause discoloration. Try turning it Off. This quick example uses the monthly free HDRI from Aversis with the Dome Scale Multiplier set to 5.
Yes, I have the same issue: how do you scale the environment in Iray so that it looks in proportion to the figures? Here is what I found. Aside from the focal length of the camera (which can only be adjusted within a small range, without distorting the perspective on the scene too much), the most important variable seems to be the Dome Scale Multiplier. I did a few test renders, with a 1m x 1m cube, with the Winter Forest HDR I got from hdrlabs.com . I used the following values for the Dome Scale Multiplier: 3, 5, 10, 20, 100 and 1000. While the default is 100, it seems that 10 is generally a good number, 20 seems to be the max and you might even go as low as 3 (or 2 for a fish eye effect, perhaps). 100 distorts the HDR image and 1000 even more so. So, anyone with the same issue, try that. Happy rendering!
Have anybody figured out how to use beautiful interior HDRIs from http://hdrmaps.com/ in DS? Their format is like in attachment. As I understand the horizon (or ground) line is way off from what I see in other files. This thread was useful for playing with Dome Scale Multiplier. Is there a way to "move ground"?
Thanks!
DS unit of parameters are usually "cm".. then "Dome scale multipler = 100 "change Unit as "meter" . but it only work about "sphere radius".
eg when,, dome scale multipler = 100 , then dome radius = 20.00 means,, current dome radius is 20cm * 100, = 20 meter.
But when I need to translate Dome position negative 5 meter, (m) , I need to set value, - 500, for Dome origin Y because,,
those Dome origin (translate) unit still keep cm, not effected by Dome scale multipler.
Thanks, @kitakoredaz
What actually helped me is playing with Ground Origin parameters instead of Dome Origin.
I still don't completely understand how the interior HDRI geometry works, for example why parts are destorted, when other adjacent parts are not. The overall result I've got from hrmaps' Church interior HDRI is great, and I just ignore destortions.
To be honestly, I think,, HDRI image which offered for IBL , not supposed to adjust Y position. .
it is actually difficult to set Actor which I planned in camera, but keep original IBL light effect (with back ground I hope to be,,)
then I usually hope ,just use HDRI for lighting effect,,, (then may not need , set position of env sphere,, perfectly)
but I am really lazy man,, then hope to adjust env sphere as I like,, and locate my Actor as ideal camera position,without such distortion,, but keep identical background image,,,
is not there,, such really easy,, but flexible HDRI sphere IBL set for iray (with keep backgroound) ^^;?
Sorry to resurrect this old thread, but I've been having this problm with every interior HDRI I've tried. Has anyone finished out a way to scale HDRI's so they aren't 1000 times the size of characters?