Ocean skyline noise

[jstrob]

I took the same displacement I was using on a plane and that was working perfectly (16 minute a frame) and I applied dit to my phoenixFD box. But after 30 minutes of rendering not a single bucket had appeared. So I lowred all the vray setting to the minimum and put 256 as edge lenght in the vray disp mod and I used 1 as ocean subdiv and still after 30 minutes, nothing...

[oophus]

I took the same displacement I was using on a plane and that was working perfectly (16 minute a frame) and I applied dit to my phoenixFD box. But after 30 minutes of rendering not a single bucket had appeared. So I lowred all the vray setting to the minimum and put 256 as edge lenght in the vray disp mod and I used 1 as ocean subdiv and still after 30 minutes, nothing...

I tried the same thing, with the same result as you got. The renderer never started, or I couldn't bother waiting any longer seeing as the time took forever compared to the normal method.

[jstrob]

And strangely enough I see no precomputing of displacement in the rendering dialog like we normally see when rendering with displacement.

V-Ray 3.30.01 and PhoenixFD 2.2.0 Build 1510206357

[jstrob]

ok I think I found a key to the problem. I had like 30 cycles of meshsmooth in PhoenixFD so I put it to 1. Now the displacement precomputing starts after 6 minutes and I see buckets starting to move! It rendered a small region in 12 minutes. I'll try to find how to accelerate it even more.

[flipbook]

Ahh ... vray displacement ontop of mesh smooth's! Enough to make me cry at render time Let us know how you get on, be interesting if it works

[jstrob]

So finally I can render in decent time. If I activate static geometry in the displacement mod it's very fast. But the problem is now that the simulated area of my ocean inside my simulation box is also getting displaced by the VRayDisplacementMod and it gives a very sifferent result in that area and creates all sorts of artifacts...

Is there any way to substract the simulation from the VRayDisplacement mod? A workaround would be to output 2 render (doubling render time!) and masking the simulated part, but the oceans are not matching exactly so I fear it coud be complicated.

I think you should maybe escalate the PhoenixFD horizon noise to a critical bug please...

With the phoenixFD displacement



With the VRayDisplacementMod:

[Ivaylo Katev]

well, you can create plane with rectangular hole for the simulator, this is the usual way with the most liquid simulator products.
but i winder why you are worrying about the noise, for me the grid artifacts visible on the shots are more disturbing. is this the grid based core?

[jstrob]

well, you can create plane with rectangular hole for the simulator, this is the usual way with the most liquid simulator products.
but i winder why you are worrying about the noise, for me the grid artifacts visible on the shots are more disturbing. is this the grid based core?

For now I am just trying to take care of the noise and I sent you 2 animations by email (I can't show them here for NDA reasons) and you will see the noise I'm talking about that is impossible to get rid with the phoenix displacement method. About the grid artefact it's just a test frame that we don't see in the final. There is no grid artefact in the final as far as I know.

[Ivaylo Katev]

sorry for the delay, i saw the videos, really the noise is unexpectedly high, not sure why. can you tell the subdivision parameter value?

[jstrob]

Even with the highest ones the noise doesn't reduce much.

For this particular render they were like this (a bit higher than I normally go fro any final render):


ocean subdiv in Phoenix: 7
meshsmooth cycle: 30.

I use vray 3.30.01

[Ivaylo Katev]

no, i mean the ocean subdivisions, see the rendering panel

[jstrob]

no, i mean the ocean subdivisions, see the rendering panel

Yes I wrote it too: it was at 7 and meshsmooth cycle 30.

[Ivaylo Katev]

well, 7 is big enough, it may be the mesh smooth, not sure.

[jstrob]

I tried all sorts of combination of meshsmooth and ocean subdiv and it couldn't remove the noise.

[Ivaylo Katev]

seeing the movies again, here is what i mean - the noise is very probably related to the moon, or sun, or whatever is this reflected in the water (can't see it)
the other video has no noise, but the horizon looks flat. in the very first ocean implementation, our horizon was also flat, but we changed this because is unnatural. i think it's may be not a bad idea to make it optional.