Physical scale in the Max Exposure Control?

[Nicinus]

Hi all,

I'm a relatively new user of max and vray and brand new user of vray RT, with some issues that confuses me:

I'm trying to understand the effect of the Max exposure control. I was under the impression that this had no effect on RT, but I have a scene that gives me identical results in RT and vray render when I have exposure control active, but when I switch it off RT stays the same while vray render gets decisively darker.

For instance, there is a vraylightmtrl plane with a sky texture in the background that becomes almost black, and my gut feeling tells me this has something to do with vraylightmtrls as other objects and textures seems ok, and the parameter in the exposure control dialog that is critical is the 'physical scale', which I understand affects the strength of lights.

Sorry if I'm giving you guys to little to go on, but I'm not sure what is relevant here. I think I somehow approached this backwards and I guess there is a way to balance this from vray so that I can deactivate the Max exposure control, but I just can't find it. What am I missing here?

Thanks,
Nic

[vlado]

Thanks for the pointer, will have to check this out. Normally, the physical scale affects photometric lights (including the V-Ray sun and sky) even if the exposure control itself is disabled.

Best regards,
Vlado

[Nicinus]

I'm not sure I follow. If I set the exposure control to none, I don't seem to have the option to set this parameter or is the physical scale a global setting?

[vlado]

If you set it to "none", then a default scale of 1500 is used.

Best regards,
Vlado

[Nicinus]

I see, thanks.