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what's your workflow for setting up vray cameras?
show user profile  Boing
I usually untick the exposure setting in them as it's just an unessesary complexity but I was wondering how you guys go about setting them up. Do you just leave the lights at 1 and do it all in camera or do you set the lights up normally without exposure and adjust the rest in cam?
read 1460 times
9/16/2011 5:12:04 PM (last edit: 9/16/2011 5:12:04 PM)
show user profile  zeefusion
Light intensity left at default 30 usually if not higher.

Set ISO and Shutter speed to 100 and adjust the f-stop until the brightness is OK. Unless you are doing motion blur and DOF the settings don't really matter.

Now that Vray exposure control can be set in the environment tab, I set it up to the above and save it as a render preset and then just use standard Max cameras.
read 1454 times
9/16/2011 5:16:45 PM (last edit: 9/16/2011 5:16:45 PM)
show user profile  Error404
personally, I don't use the camera exposure very often. Even when I'm using the DOF in the physical camera, I usually turn off exposure and vignetting. I'd prefer to do any exposure and vignetting effects in comp -

read 1447 times
9/16/2011 5:26:11 PM (last edit: 9/16/2011 5:26:11 PM)
show user profile  adammichell
I've yet to try this out but may be worth exploring, using the VRay Light Meter to establish how much light is in your scene then there are photography resources that can tell you what settings to use.
read 1441 times
9/16/2011 5:44:41 PM (last edit: 9/16/2011 5:44:41 PM)
show user profile  Boing
Is there any difference/advantage to using the camera settings?

I've noticed that without exposure being used the lights can be turned way down leading to faster render times. The only advantage to using cam settings that i can think of is if you have multiple cams in a scene you can use localised exposure settings on each camera without touching global or local light settings.

Error404, do you save out in 32bit formats? surely there's a limit to what you can do with post render exposure correction?
read 1438 times
9/16/2011 5:46:33 PM (last edit: 9/16/2011 5:46:33 PM)
show user profile  Garp
The limit from the 32-bit hdr format vray outputs is far greater than what the best monitors can display. So aiming for an exposure roughly in the middle and finessing in comp works well.
The 32-bit format gives a lot of room for adjustment.

read 1429 times
9/16/2011 6:06:06 PM (last edit: 9/16/2011 6:06:06 PM)
show user profile  Bolteon
comp is meant to be a finishing touch. not fixing bad exposure/lighting.

90% in 3d.

10% in comp.

turn on the exposure, light and set up camera's like you would in the real world and you get real world results. but that's just me...

-Marko Mandaric

read 1427 times
9/16/2011 6:08:39 PM (last edit: 9/16/2011 6:08:51 PM)
show user profile  3joez
General interior scene:

f around 8
white balance: neutral
iso: 100
shutter speed: between 30 and 120

guess vertical shift (which basically means use 2 points perspective instead of 3 points)

Using a standard light as the sun (I don't want colored tints, from the sun) and a light material for the background

read 1413 times
9/16/2011 7:10:26 PM (last edit: 9/16/2011 7:10:26 PM)
show user profile  Boing
ok so you're saying basically put a real world camera setting in then adjust the lilghts until you get what you're expecting?

Is there any advantage to doing this over just leaving the exposure box unticked and doing it all in the lights?
read 1378 times
9/19/2011 2:48:01 PM (last edit: 9/19/2011 2:48:01 PM)
show user profile  zeefusion
Option A)
1) Set up your camera with real world exposure settings
2) Use a linear workflow
3) Set your lights to lumens and make them the correct size and intensity as per real world artificial lighting
4) Use correct material settings such as IOR
5) Model everything as it is in the real world

Option B
1) Take your best guess at everything and fake it to match what looks like the real world

Option C
1) Take bits from option A and option B and make a complete mess of it because you don't quite understand the complete workflow

Either option will produce an amazing image if you know what you are doing. Don't get hung up on real world values unless you are planning to do the whole process. Even then Vray biased rendering is not the best solution.
read 1370 times
9/19/2011 3:15:44 PM (last edit: 9/19/2011 3:20:20 PM)
show user profile  Boing
It's not really the use of real world values that i'm keen on, I'm just trying to understand the advantages of using in-camera exposure as opposed to not using it.

To me it's always been an unessecary layer of variables on top of light settings but it must have an advantage or it wouldn't be there so I just want to know what those potential advantages are.

Is this just another AO thing where there's nothing in it but personal preference?
read 1354 times
9/19/2011 3:38:35 PM (last edit: 9/19/2011 3:38:35 PM)
show user profile  zeefusion
Yes unless you are doing motion blur or DOF like I mentioned in my first reply. If your lighting isn't in accordance to real world then your camera exposure settings if based on the real world would be wrong.

read 1349 times
9/19/2011 4:23:24 PM (last edit: 9/19/2011 4:23:24 PM)
show user profile  Boing
OK, Cheers Zee.
read 1339 times
9/19/2011 5:47:25 PM (last edit: 9/19/2011 5:47:25 PM)
show user profile  Error404
>> I'm just trying to understand the advantages of using in-camera exposure as opposed to not using it.

For me, the only time I would want to use camera exposure is if there is a scene where I need multiple camera angles, but different exposures. One example might be if I am outside of a building for some shots, and then inside the building for other shots. I wouldn't really want to change my lighting, I'd rather just change the exposure in the camera for the inside shots to give me a well exposed interior regardless of how bright or dark the outside is. Just like if you were shooting a building for real. It's either going to be much brighter outside (daytime) or much darker (night time) and you'll most likely want different exposures levels.

And then I suppose that if I ever wanted to animate the exposure levels then I would use the in-camera exposure. But aside from those two situations, I can't think of many times where I'd want to use the camera exposure. -

read 1333 times
9/19/2011 6:39:46 PM (last edit: 9/19/2011 6:43:12 PM)
show user profile  Boing
Yeah, that was about the only advantage I could see myself Error, just good to confirm I'm not missing the point.
read 1325 times
9/19/2011 6:47:33 PM (last edit: 9/19/2011 6:47:33 PM)
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