Vray Light Multiplier Problem

[stee]

Hey,

 

Im playing around with a scene, getting to know linear workflow. Its an interior scene lit with a vray sun. The sun multiplier is 0.5, using a vray physical cam with exposure on, all good, scene is coming out looking ok.

 

I have some downlights in the ceiling and I tried to add vray lights, vray light material, vray IESs and they were all coming out black. I discovered that if I set the multiplier much higher, as in 50,000 (!!), I would finally see some effect.

 

I've tried changing the scene units, it was modelled in millimetres, but still the same problem. Setting the light to 50,000 doesnt result in huge render times or anything, but im just stumped on what could be causing this.

 

Also, in my material slot for VraySky, the sky always looks completely whited out, no matter what value is in the intensity multiplier. Im not sure if this is related.

 

[ATTACH=CONFIG]43658[/ATTACH]

 

[ATTACH=CONFIG]43660[/ATTACH]

 

[ATTACH=CONFIG]43661[/ATTACH]

 

[ATTACH=CONFIG]43662[/ATTACH]

 

[ATTACH=CONFIG]43659[/ATTACH]

[archigem]

Sky is ok, but why did u override it manually when the intensity and sun node is the same??

Also I think you need to read the facts about vray sun as at .5 intensity it is still very bright, and after using the vray physical cam u toned it down. In the process it's very natural that u can hardly see any effects of the interior lights, in the scene like yours.

Though u do not need to worry about the multiplier. just go with the values which suits you.

Also do not use the vray sky as the external environment. In the interior scene it is meant to provide the environment lighting only not the background.

Hope this will help.

[notamondayfan]

I agree with Prashant, in a day light situation like this, in real life, you wouldn't see the affect of the ceiling lights on the room, as the sun light coming through the large openings would be far stronger than the ceiling lights.

 

This is probably why you are having to use such high values in the light settings to make the affect visible.

 

If you want to see the affect of the interior lights, adjust the sun so that it's more dusk or early morning, when you have less intense sun light.