I cannot figure out how to do this. I'm trying to do an undersea scene in Superfly and while I can find lots of old threads on undersea stuff in Firefly, the only mention of doing god rays in SF, or example of caustic shadows underwater in SF, was from a 2017 thread and I cannot find a followup if there ever was one. I've got volume scatter in a box primitive for my water "fog", spotlight above the water surface which is textured and refracted, and while the light and volume comes through just fine, I'm not getting any caustic shadows or effect on the volume itself from the lighting. Would I need to put another box over top of my volume box, flatten it and make it something like a pane of distorted glass to cast caustic shadows through it onto the objects inside the volume box?

What version of Poser are you using? I think there are some issues with Poser 12. A bug report has been filed.

If you're using Poser 11, have you seen this thread?

https://www.renderosity.com/rr/mod/forumpro/?thread_id=2946041

THANK you. I don't know if I just hit all the wrong keywords or what but neither Google nor the forum's advanced search engine pointed me to that one!!

I'm using 11, I was just trying to go about it as if we had actual physical based rendering. xD

Maybe that bug is extended to Poser 11. I cannot get the gobo to work at all. Set it up exactly as in that thread with the water box and the plane, shaders copied exactly for both, light set to 1500%, shadow blur radius at .5, and all it does is dim the light coming through. Have even tried it without the water box, nada. I have messed with size and height of both water box and plane, I've messed with the caustic ratio value, I'm just not seeing any cautic pattern whatsoever. I suspect it might be a scale issue since I keep mine set on Poser Native Units which seems to be not popular, but honestly I'm just lost right now. Is there a known issue with shadows in P11 SP2? (I can't update to SP3 due to having Win7.)

I don't think there's a shadow problem exactly, but shadows can be really finicky. This thread might help:

https://www.renderosity.com/rr/mod/forumpro/?thread_id=2948779

Also, you could try replying to the first thread, about underwater caustics. Bagginsbill is still around, and might offer help if he gets an ebot.

Thank you very much. This is what I get for not checking the forums regularly. xD

For Poser 11 you need to be using the right version and the right rendering method. For SuperFly, the Smith Micro Poser 11 SR5....

"Enabled volumetric effects for GPU rendering (Pro only). Quality is limited compared to CPU rendering."

If appears you're still using SR2. I've never heard that some later SR'd versions of Poser 11 won't run on Windows 7. I've seen 11.1.1 (Jan 2019) running happily on Windows 7. The Poser 11 SR6 patch was back in January 2017, so the 2019 11.1.1 must surely incorporate it.

HartyBart posted at 1:01PM Fri, 29 January 2021 - #4411348

For Poser 11 you need to be using the right version and the right rendering method. For SuperFly, the Smith Micro Poser 11 SR5....

"Enabled volumetric effects for GPU rendering (Pro only). Quality is limited compared to CPU rendering."

That explains a lot. I knew we couldn't use volumetric atmosphere at all, did not know it was affected otherwise!

If appears you're still using SR2. I've never heard that some later SR'd versions of Poser 11 won't run on Windows 7. I've seen 11.1.1 (Jan 2019) running happily on Windows 7. The Poser 11 SR6 patch was back in January 2017, so the 2019 11.1.1 must surely incorporate it.

When I went to download SR3, there was no link for anything other than Windows 10. I asked tech support about that and they told me I need to upgrade my OS. I've never seen a complete lack of backwards compatibility in a service release before this.

My P11 is showing as 11.2.272; My machines are Win7