V-Ray 3.3 - V-Ray Exposure Control gone in 3.3

V-Ray V-Ray for 3ds Max General
1

Has 'V-Ray exposure control" been removed from the environment settings in version 3.3? If so, this is a problem for me since the new PhysCam that replaced the V-ray cam does not work with V-ray RT in Max 2016.
My work around previously was to use a standard camera plus V-ray exposure control and adjust my f-stop and shutter speed there.
Is the use of f-stop and shutter speed to adjust exposure no longer a viable workflow. What am I doing wrong?
Gavin

2

Hello,

Yes the exposure control is removed for Max 2016 but the Phys Cam should work with V-Ray RT. What issues are you having with it ?

Best regards,
Yavor

3

Hi Yavor,
Thanks for replying. To a give a little background, I try and simulate photography when I render. I use the V-ray daylight system and sun set up a lot. Its fast and returns a clean result and is perfect for quick outdoor scenes. My usual process was to create a daylight setup, create a V-ray camera (I had to use V-ray exposure control when Max 2016 was released) and adjust my f-stop and shutter speed to get the desired result. This worked because the result roughly matched actual real-world settings. My overall problem is that I cannot recreate this set-up with the new workflow without inputting seemingly completely unrealistic settings. Here are my problems:
1. After some experimentation I achieved a good result by setting the ‘Exposure for Non-Physical Cameras’ and Ev Compensation for PC’ to 0.0 and 0.0 and used a realistic ISO number, f-stop and shutter speed on the Phys cam setting but, I can only achieve this result when viewing though the Phys cam. I can no longer set the exposure globally by picking the camera in the exposure control.
2. The production rendering mode and V-ray RT mode return a different result.

I just want to recreate the look of the same result as the old V-ray exposure settings.

Thanks
Gavin

4

Hi Gavin,

When using Per-Camera exposure, looking through the Phys Cam and switching the exposure gain of the camera to Manual, you should get the exact result as the old VRayPhysicalCamera when tweaking shutter speed/f stop/ISO:

About looking through perspective using the exposure settings of the camera - this is something we should discuss with the developers.

About point 2 - I can’t reproduce this, is it still happening with the setup I gave you ?

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5

Hi Peter,
I’ve managed to get a matching result so thank you for your help in that regard.
In regard to my 2nd point. I presume there is now no way to match the camera exposure globally or use traditional exposure control (f-stop, shutter speed and iso) in the environment panel. The advantage of this is mainly that I can test render without always looking through a camera. It would be good to have this option back.
Thanks for your response all the same.
Gav

6

I agree this was a good thing to have around. In the meantime, you might try using the Exposure control in the Vray VFB as a quick workaround for now. Just adjust it to get a good exposure when rendering from the Perspective view and turn it off when you render from a camera. You can use the VFB history functions to visually match the renderings.

Of course, if your camera exposure is beyond the scope of the Exposure Control, this will not work. It seems to work in most cases here…

Hope this helps some…

-Alan

7

Hi,
What can I do if I want to use the old 3dsmax standard cam with “Orthographic Projection” option and match my exposure from other Vray cam in my scene ?

8

Well, not much right now… It’s not a problem to unhide the V-Ray exposure control, but we have to make it work with the 3ds Max physical camera. Will make a note to look into it.

Best regards,
Vlado

9

Thanks a lot !

10

Please do! Indispensable for RT. Why would it need to work with the standard PC? It could just be unavailable for that camera type.

http://forums.chaosgroup.com/showthread.php?85105-V-Ray-3-30-01-BETA!-available-for-download&p=671024#post671024

11

hate the fact that the vray exposure control has been removed. If it aint broke dont fix it.

How do i work around this? I use a standard 3DS MAX camera to do my perspective match and then use a dummy vray camera for the exposure. In teh environment dialogue i used to select ‘from vray camera’ and then select the dummy vray camera. This is now gone! How do i work around this?

12

hello? Anyone? Please?

13

Hello,

Currently you can use vrayCreateVRayExposureControl() maxscript function to create an exposure control like this:


vrExp=vrayCreateVRayExposureControl()

SceneExposureControl.exposureControl=vrExp

This will set it as the active exposure control. Note that Max will show the exposure control drop down as empty but the exposure control will be there.

As for the future - we’ve brought back the exposure control and it will be available in future versions.

Hope that helps

Best regards,
Yavor

14

Thanks - what about that option ‘from vray camera’ where it enabled you to select the scenes vray cam?

15

Sorry, I meant that this drop down (in the red) will be empty:

The exposure control settings are there as they were and you can use the “From V-Ray camera” option.

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16

Hi

Tried that but nothing seemed to have changed. I put it in the listener and checked environment and effects and nothing updated. PS im using 2016 3DS

17

disregard, it works. the dropdown for exposure control says ‘no exposure control’ (its not empty) and it now has the vray exposure control

thanks for your assistance

18

has this been replaced in the version for max 2016? its very useful and idk why it was removed

19

Autodesk were trying to make a universal version of exposure and physical camera that worked between renderers so chaos didn’t need theirs. Autodesk’s implementation wasn’t as successful it seems.