Smoke opacity grid texture

[Apoc519]

I'm trying to work out if there's a way similar to Maya fluids where you can add a texture to opacity that stretches based on the grid velocity. It was always helpful for add a bit of extra fine detail. Thanks!

[Svetlin.Nikolov]

Maybe this is the 'Advection' displacement mode? You can plug a PhoenixTexture there which extracts the velocity from the grid and use it as the so called 'gridless' or 'render-time' advection. You could also set the displacement multiplier to both positive and negative values in case you need to reverse the velocity. There was a topic on that here in the forums recently, and I think there was a simple example scene too.

Cheers!

[Apoc519]

That seems like what I'm looking for. Is it available in the Maya version? Can I use it with VRayVolumeGrid on our render farm without needing an extra Phoenix license?

[Svetlin.Nikolov]

Yup, it's in Maya, but it's not in the VolumeGrid, but Phoenix would not require a license for rendering, so you just have to install it on the farm and everything should be fine

[Apoc519]

My Maya PhoenixSim node doesn't have an option for "Advection" type displacement. Only gradient, surface and vector. Is it a new addition? I'm running 3.03.00 BuildID# 170227

[Svetlin.Nikolov]

Ah, yes, it's new since 3.03. Grab a latest nightly build

[Apoc519]

Where do I plug in my noise texture to the pheonixTexture?

[Svetlin.Nikolov]

You can blend between a noise map and the Phoenix Grid tex before you plug the result where it's used. The Grid Tex does not have a noise slot, because it's just a standard map and you can do anything with its output.

[thhvfx]

Hi Svetlin,

I currently run into a problem with rendering phoenix on the farm. I wonder if you can give me a full instructions about how to set up. Every time I render Phoenix on the farm, I get everything except Phoenix.

Thanks,

[Svetlin.Nikolov]

Hey,

First off, just to make sure, did you check these: https://docs.chaosgroup.com/display/...uted+Rendering

Cheers!

[Apoc519]

Can you give me an example of how this advected displacement with the phoenixTexture might work? I've wasted many hours trying so far. Is there a built in procedural noise texture in Maya that it will work with it? Multiplying or blending a volumeNoise with the phoenixTexture causes it to crash. VolumeNoise works fine if I plug it directly into displacement

[Svetlin.Nikolov]

Sure, here you go: phx_advect_displace.zip

[Apoc519]

that example doesn't include any noise. How would you set up the blend/multiply between the noise and phoenixTexture. Which kind of noise would you use?

[Svetlin.Nikolov]

Hmm, let me try to reproduce the crash you are getting...

[Svetlin.Nikolov]

Used a colorComposite here and couldn't crash it. Would it be possible for you to send over a scene that helps reproduce the crash? Also, are you crashing it with a nightly build?