Volumetric Rays


I ran across a post on deviantArt the other day, asking how to produce volumetric effects using the AtmoCam for Iray. That got me wondering why the hell I’d never done that myself, since I adore volumetric effects in all their forms. So I made an image of a big kitty laying in the light and shadows, and then explained what I did for the person with the question.

And then, like a doofus, I didn’t bother to do anything else with the information… at first. It took a couple hours, but I finally remembered I have a blog, and on this blog I sometimes post 3D stuff. So here it is, the image and the way I lit it, just in case anyone else out there is wondering how to get light rays in Daz Studio with the AtmoCam.

What I used:

Daz Studio 4.9

AtmoCam for Iray

Daz Big Cat 2

Sun Hall

iRadiance Light Probe Expansion 2

Iray Ghost Light Kit

What I did:

(no, this is not the only way to do this stuff. This is just the process I used to get this result.)

I set the Atmo Cam to “SunRise” and “MedHeavy.” I also used one of the iRadiance Light Probes and set the draw dome control to “off.” The HDRI happened to make two visible bright blobs that worked for suns. Then I took a spotlight, dragged it out beyond the mountains, and positioned it so it looked like it was coming from one of the HDRI light blobs, the larger one. I set the temperature to 10000K (super bright white) and the luminous flux to 10000000000.0. Yes, I know that’s an insane number, but that’s what got the sunlight effect. I tried a distant light, but it never did produce any kind of rays. The spotlight could be focused a bit, I put the spread angle at 90 and that kept the light where I wanted it. I also added a big, weak Ghost Light because the shadows were too thick around the throne area. I rendered in Iray with spectral rendering and caustics turned on, but I don’t think that affected anything. Sun Hall doesn’t have glass in the windows.

So, there you go. That’s one way to get a decent volumetric effect. (And yes, before anyone mentions it, I know the image is noisy in the shadowed areas. It was an experiment, not an attempt at perfection.)