Helgard opened this issue on Jun 26, 2010 · 195 posts
bagginsbill posted Tue, 29 July 2014 at 6:45 AM
Quote - Here is the maths (light4, and the ground plane). (Lights 1 2 3 are off.)
I always work in Poser units (1 = about 100 inches.)
It may be that you work in PNU, but I set the shader to work in inches, because the P node is always 1/10th of an inch and ignores your Poser Display Unit.
So you actually set the transmission distance to 10 inches.
That's ok - sometimes water is that densely filled with particles. But if you meant 1000 inches you should type 1000 there.
When simulating very dense particle concentration, you would use brown or green, not blue, since the attenuation of water is not the main factor - it's the particulate matter suspended in the water.
If you really want to work in PNU, so that you can express the water level and the transmission distance in PNU, then you should change the Subtract node's Value_2 from 1.000 to 1/103.2 which is 0.00968992248.
Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)