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Paolo Zirpoli avatar image
Paolo Zirpoli asked ·

Arnold's Atmospheric Volume is way too thick

Hi everyone.

I'm experimenting with Arnold's Athomespheric Volume.

I'm following these instructions: https://support.solidangle.com/display/A5AF3DSUG/Atmosphere+Volume

The problem I'm having is that the atmosphere is so dense, at the lower possibile density value, that you can barely see anything.

In the first screenshots you can see the volume settings, the light settings and a render showing the result:

as you can see, there is barely any color, the light it's completely absorbed by the atmosphere, there is no bounced light pretty much. And this is with everything to the minimum settings!

http://i.imgur.com/Lfsfe8T.jpg

In the second one, you can see the camera settings and a render without the volume:

http://i.imgur.com/N4sTU3L.jpg

Anything more than 0.02 and the render is essentially a solid white block of fog. How can I get a soft scattering similar to the first image in that Arnold's documentation? What am I missing? Thank you very much.

volumetrics
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Arvid Schneider avatar image
Arvid Schneider answered ·

You have several options to control the density. Personally, I change the density to 0.001 ( 1 zero more than you have). If that is not enough, you can also change the color. And what you can also do is control the volume contribution on the light itself.

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Brian Foley avatar image
Brian Foley answered ·

Atmosphere is also dependent of scene size.

Below is a 1 cm sphere with an area light and density set to .1.

Here is a 1 m sphere with the light proportionately the same distance and size to the sphere but to get the same look I need to adjust my density 1/100.

Also, setting normalize on/off on a light will have very different results.

@paolo zirpoli


1cmcomplete.jpg (73.6 KiB)
1mcomplete.jpg (56.7 KiB)
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