OTOY Forums

Hi,
i'm making some clay comparisons with other engines, both unbiased and not.
I seem to understan Octane's GI is based on an evoluted AO concept, but i find quite strange (even if it is beautiful) the decay of light in interior situations.
I raised AO ray up to high levels so i lose AO effect and i get GI-like one, but light's decay still doesnt seem to behave correctly; looking at pic here, you can see light on walls, floor and roof is nearly same near and far from window, while FRYrender one has a natural decay.
I tried to switch to Path Tracing but nothing seems to happen; i wonder what i am missing in order to get physically correct GI.

thanks,
paolo

maybe the fact that you have to use pathtracing to have a correct GI.

hi, thanks but as said i dont see any difference when switching.
PT *should* behave correctly but for some reasons it stays the same. Is it supposed to be fully working already or what ?

thanks,
Paolo

Pavlov wrote:hi, thanks but as said i dont see any difference when switching.
PT *should* behave correctly but for some reasons it stays the same. Is it supposed to be fully working already or what ?

thanks,
Paolo

how are you switching to path tracing ?
are you swapping the node in the preview config graph ?

sometimes users make a pathtracing node or equiv and click on it and they think they are using pathtracing, but they aren't.

Radiance

deffinatly user error then.

Make sure you dont have any of the material override or force direct enabled in the main bar.
Rendering an interior with PathTrace yeilds a completly different output unlike an AO pass.
You can attach your scene to the thread and Ill show you how to do it correctly, if you still have problems.

-mads

thanks, i've managed to make PT work.. i think i did it correctly even before (i simply swapped Kernel node to PT) but it didnt change. After some re-trying it worked.
BTW it is much slower
I've a GTS 250 board, so a low level one. Which gain ratio should i expect with a GTX 480 ? Is it best one for Octane ?

thanks,
Paolo

Pavlov wrote:thanks, i've managed to make PT work.. i think i did it correctly even before (i simply swapped Kernel node to PT) but it didnt change. After some re-trying it worked.
BTW it is much slower
I've a GT250 board, so a low level one. Which gain ration should i expect with a GTX 480 ? Is it best one for Octane ?

thanks,
Paolo

the GTX480 rocks.
check the videos page for a demo of 2x GTX480, but even a single one is wonderfull to work on.

Radiance

Paolo, is that you from Newtek Forum???

hey Pixym, sure i am !
Nice to see you here...

Paolo

I see scenes have differenet lighting. In octane scene behind the camera as though the no walls and light passes through