Clouds clouds clouds

[lander]

I used your cloud setup today but didn't quite like the look you get with the density noice map (unless I wanted torn thunder clouds) I'll have to play more to get the look that I want.


However, I can't get any coloring on the clouds when using a sun system. (Vray sun) when placed low on the horizon.
I have to include a spot or directional light to get the beautiful coloring on the clouds. Why is that?

Duplicating a cloud sim grid makes the entire Max scene grind to a halt. Super slow viewport update. Delete all but one and everything is super responsive again.

How do I make a grid loop on one specific frame of the simulation. Say I really like the look of a cloud in frame 45. Now I want that cloud frame for the entire shot.

[Svetlin.Nikolov]

Hello,

If you have the GPU preview enabled and you don't have enough detail reduction, you are going to get a slowdown, especially with large viewport and many grids. Note that the GPU preview won't auto-reduce detail like the voxel or particle previews. You might want to enable the "Only if selected" option in the Preview rollout if you want to have one visible grid, but with the maximum detail, or otherwise you'd want to reduce the detail for all grids.

Regarding looping, check the docs -> Input rollout -> Mode = Cache Index

Cheers!

[lander]

Great, thanks.

What about the sun system?
I can post some images to show what I mean.

[Svetlin.Nikolov]

Does it reproduce with a brand new scene?

[lander]

I think it works as it should.
I was hoping to get more of a coloring effect on the clouds with a sun set. But that is no problem. I'll use the Atmosphere pass for that or add an extra light.

[Svetlin.Nikolov]

Ah, okay. Hopefully soon we'll be looking into improving the scattering algorithms, so this might be helpful for such setups in the future.

[lander]

What causes the noise?
In the scene the is a cloud, VraySun, VraySky, VrayCamera
GI Primarey LightCache
Secondary none
I feel stupid

Also tested a fresh scene. cloud, spotlight, solid env color same result.
I tried Bruteforce and Image Sampler at 1-24 noice theshold at 0,005 but I see no change.
So I guess I'm missing something.

Now these clouds are quite dense. 0,75 simple smoke opacity. It's less recognizable when I lower it to 0,1.
Can it have to do with the clouds scale?

3.11.03 Nightly, Build ID: 2018081128442
Max 2016
Vray Next

[georgi.zhekov]

I can't see the attached photo, but what if you disable the Phoenix Light Cache from the Smoke color options?

[lander]

Didn't know I could. But on the other hand I get the same noise with only Brute force. I'll try to fix the image so you can see. It's worst in the dark areas.

[Svetlin.Nikolov]

The Phoenix light cache is not the same as the V-Ray light cache, check the smoke color rollout.

[lander]

I made this GPU rendering of clouds last night and I am aware that it's a bit of a hit and miss when rendering multiple grids at the same time with GPU.
But what should I be aware of cos it seems that it works well as long as they don't overlap or the camera enters the grid.
Or have I missed something.
I'm linking to a vimeo file for you to look at.

https://vimeo.com/291659831
passwrd: phx

Max 2016, Phenix V: 3.11.03 build ID 2019081128442 Vray Next 4.02.04.00001

Have a great day everyone

[georgi.zhekov]

Looks great, you just need to know that if there are overlapping walls of the grids then those won't be rendered correctly.
You can workaround this by just offsetting the position a bit.

The camera inside of the Grid should be fixed for the next release of V-Ray.

[lander]

Good so that was as I suspected. Next version of Vray as in official release? Any hope of it being addressed in a nightly build before that?

[georgi.zhekov]

Ah, if you have nightly access - the fix is already in the nightlies.

[kostadin.petkov]

Sable nightly builds should also have it.