Atmosphere shadow problem

[Hannes]

I also tried your cloud solution, Richard. 
It looks quite nice, but takes ages to render. 
And it doesn't seem to cast a shadow. 
Thanks anyway, cool idea!!!!

[WAS]

Actually it happens only with shadows onto the atmosphere, when the opacity of the shadow casting object's default shader is either less than 1, or if an image is used for opacity.

I believe this coincides with a transparency ring setup like yours and mine. Both needed opacity. Mine though did feed into a surface layer, with glass shader as main input, and secondary alpha mask as surface mask. For semitransparency.

[Hannes]

In my scene I used two ring objects (planes).
One with the glass shader setup with cast shadows off, and one invisible plane with a simple default shader and a b/w image map in the opacity slot with cast shadows on.

[WAS]

In my scene I used two ring objects (planes).
One with the glass shader setup with cast shadows off, and one invisible plane with a simple default shader and a b/w image map in the opacity slot with cast shadows on.

I think that's what I did, since the glass trans plane will give you it's full shadow. Not positive though. Just throwing it out there, it may be something that can be referred in change logs. Cause, like I said I don't remember it, and it should have been very obvious.

[Tangled-Universe]

I also tried your cloud solution, Richard.
It looks quite nice, but takes ages to render.
And it doesn't seem to cast a shadow.
Thanks anyway, cool idea!!!!

At least that fits with why my idea (of increasing atmo ceiling) didn't work either...interesting.