Show Us Your Iray Renders. Part IV
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...yeah that's my thinking. Don't want to bugger something up if I do it wrong. That's why I initially jumped on Iray, as to fine tune 3DL, you have to use it in scripting mode.
...as it is a night scene the settings I am using are, ISO 400, f22, speed 1/250.
More work on centaurs...
Love the Stinz-style centaurs.
I'd go with slower shutter/lower f-stop...even to where it looks like daylight at first, then once the lights are set, back it off some. You'll probably end up much different than those settings.
...so is there a PDF or HTML guide for using Real Lights for Daz Studio IRay?
Those are Tri-X black/white (fairly fast film) settings for middle-of-the-day daylight! No wonder it's so dark. A comparable night shot might be 6-10 stops slower. Currently, it doesn't matter what you adjust -- you can do combinations. A comparable night-scene using ISO 400 film might be f/2.8 and maybe 1/60 or so, and then adjust one stop at a time while you do small test renders.
...using those values it is like very bright noonday. Keep in mind I have a photometric distant light set at 12% for moonlight.
What does "12%" mean? If you're using intensity percentages it's no longer acting as a photometric light. Leave it at 100%, and adjust the luminosity. As I noted, the distant light appears to use incident light values. Given the standard scene size unit in D|S is the centimeter, that means lumens per square centimeter incident on the scene. Even a couple of lumens per square centimeter can be a good amount of light.
Your lighting is off balance. There is no ISO 400 film that can render a night scene like that at f/22 and 1/250 second. It's simply not photographically possible. Your environment is too bright, making you stop down to compensate, and then the scene lights are too low.
Good Morning, I'm back
kyoto kid
Did you manage to download the .duf lighting file and merge it into your scene?
As has been said, your Tone Mapping setting as too high.
These are mine.
Tone Mapping
Environment. I found a night sky .hdri and deleted the sky dome and plugged it into the dome.
Last Render
...here is an example of the moonlight effect I am trying to reproduce. As Iray only has a bright "sun", and I am using an HDRI which cuts that out anyway, I need to use a distant light instead.
Unfortunately I cannot find any "available light" photos which don't involve snow that either do not have the moon in the frame and/or are long timed exposures which brighten the overall scene unnatrually.
The "fireflies" in the above images are actually caused by the sparkle of the snow.
Agreed. I'm working on a render of a night time scene and wanted a blue distant light to simulate the moon, which isn't visible. I'm not attempting physically accurate lighting but wound up using 0.25% on this directional light to get just enough illumination to balance the main spot lights on the subject.
If in doubt about good ISO, shutter speed, and f-stop values for night time in the city, why not get out a digital camera, preferably a DSLR, and shoot some pictures. Exposing for the ambient lighting will blow out the electric lighting, so you always want to consider the electric lighting on your subject to be the main factor in exposure. Shutter speed isn't too important setting in static images and renders. What you want to use is Exposure Value (EV), which allows a range of f-stops and shutter speeds for any given lighting condition. Pick an EV and then use the corresponding shutter speed and f-stop to go along with it.
http://www.fredparker.com/ultexp1.htm#Light%20Intensity%20Chart
You can do searches on Flickr. I entered "city night" and got loads of night time images. The EXIF is usually available below the picture.
Kururu for G2F with EcVh0 Iray Skin Shader. Postwork: a little gamma correction as it was a bit washed out.
here's what I got for a moonlight
I set the Environment light to Sun-Sky Only
Environment Intesity; 0.12
SS Time; 2pm
SS Blue-Red Tint; -0.42
what do you think?
Ice: I was going to suggest expanding the 'sun' diameter a lot to soften the shadows... but thinking about it, I think that looks pretty spot-on.
Thank you :)
I just ran another test render, we can still use emissive surfaces when using Sun-Sky Only , so that means we can still light up the light bulbs and other stuff
I'm not sure that's true? Better make sure.
Keep in mind you can use the sun on 'Dome and Scene,' just make sure there's no environment map.
http://www.daz3d.com/gallery/#images/84117/
Used an HDRI of the Milky Way, but it just didn't give me quite the ambient I wanted. So I added a blue distant light to the scene which immediately overpowered everything. I had to turn it down to 0.25% to give the "moonlight" effect.
I'd go a little lower on the Environment Intensity, if using additional lights...maybe 0.09.
I have another test render cooking right now,,,I should have something to post in about 10 min or so
k,,here we are,,,Sun-Sky Only mode with emissive tube light
there is an artifact in the ivy,,but lets not worry about that part
If you have Photoshop or GIMP, you can always add or remove the moon, giving you more choices. The latest versions of these programs can accept HDR and EXR files.
If you use just any image for the night sky (not an HDR), it likely doesn't have the right gamma for use in the Iray Environment dome, or even on a backdrop prop, so it over-exposes. As others have noted, when using the Environment dome you can turn down the Environment Intensity to suit your tastes and needs.
I misunderstood what Kyoto Kid was writing about when I wrote my post above. I thought he was wanting reference imagery. Glad you clarified it here.
I just discovered the wonder of saving normal maps as .hdr files. Look at that skin detail. Also I painted those eye textures by hand and am pretty in love with them.
New Icon!
That is good :)
What do you mean by saving the normal map as an hdr?Did you open the normal in GIMP and resave it as an hdr?What surface slot did you put it in?How did you do it ? :)
...that does look pretty spot on. My only issue is when using the Sun-Sky there is no detail (eg clouds) to the sky. That is why I have been using a Photometric distant light and night sky HDRI. In 3DL it would be easy as I could use one of many skydomes available, but in Iray using Photoreal mode, they block out the sun as you cannot turn shadow casting off.
I could just go with a photo backdrop but like Tobor mentions one can run into gamma issues. Not so bad in daytime but it does take a bit of adjustment to match the gamma level of the photo so the entire scene looks uniform (like what I had to deal with in the scene with the two young girls at the bus stop).
Most city night scenes and even HDRIs I've looked at also have buildings, light trails from vehicles, and other lights/elements I do not need in the scene. I just need a good night sky backdrop with some cloud detail to it. There are so few night HDRIs that focus on the sky rather than the surroundings which is why I have been using the Skies of Economy ones. As the scene is big, I need at least a 10K image.
The issue with using a backdrop that has the moon in it (even if photoshopped out) is the sky lighting will be incorrect. I need the "moon" to be off to the left of the camera, not dead on from the front.
Well I painted the normal map in a combination of blender and substance painter and then saved it as an .hdr file, since hdr have more color data per pixel there's more detail than I would otherwise be able to get in a 4k texture. Obviously if you convert a jpeg to a hdr it won't improve the look of the texture, but I have taken to converting all my .tiffs to hdrs purely because the filesize is so much smaller. Hdr files are really great in terms of file size.
A WIP, stars missing.
"You're not afraid of the dark are you?"