Any way to get around the max fog distance?

[Neilg]

I'm working on an aerial where we see right to the mountains at the horizon (we were provided with a fully textured 100kmx100km model...) and the max fog distance ends up with the mountains nearly completely obscured. Is this a hard vray limit or can I change something in max to push it up?
My scene scale is in inches/displayed in metres, but the maximum fog distance caps out at 25,400m. I thought it had something to do with the distance from origin setting (25.4) but changing it doesn't raise the cap at all. If I could get it up to 40-50km that would be perfect.

I'm planning to render the background separately from the foreground so any lighting accuracy issues don't matter - i'm just trying to avoid converting between system units because it's always caused issues. FG/BG will be sharing forest objects, and all the fg architecture is built in inches.

[vlado]

Have you tried modifying the distance from MaxScript?

Best regards,
Vlado

[Svetlozar Draganov]

I can confirm that higher values for Fog Distance parameter could be set via the following MaxScript command:

(getAtmospheric 1).fog_distance=value

The value in the UI won't be updated properly if it is greater than 25,400m but V-Ray will get it from MaxScript.

If the scene contains multiple VrayEnvironmentFog nodes the command will change to:

(getAtmospheric 2).fog_distance=value

Please note that if Scene Units are Inches and Display Units are Meters you have to manually convert the value from Meters to Inches when using MaxScript.
50km = 50 000m = 1968505 inch (50 000 * 39.3701)

(getAtmospheric 1).fog_distance=1968505

A note about increasing Fog Distance value UI limitation has been added into our system.

[Neilg]

nice, that's perfect!

Thank you Fantastic support as per.