CGTalk - Under Water Object (Photons?)

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nepaligurkha

01-29-2006, 03:47 PM

Hi,

I'm making a like a forest scene. I have a stream kind of thing, i used a Ocean shader for it. But any way i just wanted to test out what it would look like if i put in rocks in the water. But the problem im having here is there is like light coming between the rocks. I have a pictures. Im not very good at setting up light settings, so could somebody give me advice on the problem. I have screen shots of the settings. I don't know exactly how to explaine the problem its more like there is light coming from the bottom of the rocks.

1) http://img364.imageshack.us/my.php?image=transworking3ir.jpg (the brown things are supposed to be rocks)

2) http://img364.imageshack.us/my.php?image=watswrong9fe.jpg (another view of the problem)

3)http://img364.imageshack.us/my.php?image=light3ea.jpg (these are the light settings)

4) http://img364.imageshack.us/my.php?image=watswrong23jj.jpg (these are the water shader and rendering settings)

Thanks
-Tabha

nepaligurkha

01-30-2006, 09:39 PM

anyone have any advice? is this happening because of the photons from the directional light?

royterr

02-01-2006, 01:51 AM

how many lights do u have in ur scene?

start with photon lighting (only). then if correct add FG and caustics...this way you can isolate the problem...

for GI try 100000 phtons
choose the right radius (or 0).

nepaligurkha

02-01-2006, 03:57 AM

i only have one directional light, if i choose 0 as the radius, mentalray will assign it by itself right? 100000 isn't that going to take a long time to render?

royterr

02-01-2006, 04:55 PM

not necesseraly, it depends on your render global settings.

try a min sample of -2 and a max sampe of 0 with a box filter....it should go fast

thats right for the zero radius.

so try only gi, and see what happens...

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