Iray emission light and V4 skin settings

eiliestl

I can't get my emission lights to glow . With every render the light looks dim .
And I need some good skin settings for V4 . Can't seem to find any anywhere

The Blurst of Times

Well, some will tell you to switch the emitter to Watts... but I found Wattage to be a little unreliable because you're no longer talking about the filament in an incandescent bulb, where we associate Watts with light. Your emitters have a lot more surface area to consider.

I like the candela per unit area default for my lights. It gives me more of a standard across a variety of objects, I think.

So, you just crank up the luminosity. You don't need to touch temperature, although knowing the temperature spectrum of emitters is a good thing for a physics system like Iray.

It also depends on your camera setting, like the ISO. You may not need as many candela if you have a high ISO.

I've found emitter objects even easier to work with than point lights, myself. I read a lot on light, optics, and camera/lens behavior when I started with the Iray beta.

Can't really help on V4, however. The Iray settings also can work differently from one skin to another on the exact same G2F model. There are a ton of factors to consider.

BeeMKay

I've found that you need a minumum of 45.000 units. Some scenes need as much as 500.000 units in Luminence.
Thing is that the light behaves as normal light would - the lower the luminence, the less "far" the light shines.

j cade

The other think to note is that real world glow comes from light interaction with particles in the atmosphere. So you're going to want to turn on bloom in the render setting to simulate it.

*edit* here's a torus as a light with bloom enabled and the settings messed with a bit. also the luminance value was 562668.31