Glass Geometry With Bubbles Problem

[DJ_Dhrub]

Why it's looking like that? Is that a simulation problem or something has to do with render settings?
The Liquid is fine but the bubbles!
Please, explain.
I have tried watching all the tutorials but no solution till now.

[Svetlin.Nikolov]

Hey,

We are working on this as we speak. Will it be okay it you enable Render as Geometry on the Particle Shader? This will automatically disable Approximate scattering though, so your foam will render a bit darker.

Cheers!

[DJ_Dhrub]

No no. I don't think it's a problem with the build. The render was coming nice. But then I resimulated for the final and now the render is coming like this. And Reder as geometry is turned on. As if I turn it off it's almost a black render with almost no bubbles.

[Svetlin.Nikolov]

Hmm, maybe after the resimulation the particles have moved away from the glass walls? Can you tell using the particle preview is that is the case?

[DJ_Dhrub]

Well, I am attaching the previous render using the previous simulation and the current state of the simulation. As I am fairly new to Phoenix-FD I guess you can tell me better.

[Svetlin.Nikolov]

Looks like that could be the case. You'll get the glass geometry effect when the bubbles are intersecting the glass and if they are not anymore, you have to go back and revisit what foam/dynamics settings you tweaked before resimulating...

[DJ_Dhrub]

The what should I do as of right now? How can I make sure of so the bubbles intersect with glass? What setting do I need to change?

[Svetlin.Nikolov]

Hey,

If you had it looking right and then it changed after resimulating, the best solution would be if you kept a backup of the settings before so you can compare them with the current settings and find out what changed.

If it's too late for this, then you have two approaches:
- the easier and more hacky one would be to simulate with a thinner glass and then render with a glass that's thicker on the inside so it can intersect the foam and you'll get the glass effect.
- the approach that would take more time and simulation to get right would be to simulate with such settings that the foam head would better fill the space above the liquid. You could create more foam by increasing the foam amount or lowering the birth threshold, and also if it seems to you the foam head doesn't keep its volume and subsides quickly, then you could increase B2B interaction. Another thing you should watch out for would be the rising speed of the foam - you could increase it and this way more foam will rise quickly to the surface and increase the beer head's size. The goal is to create more foam so it would fill the entire space above the liquid. You could also increase the Sticky parameter of the foam so it would stick to the geometry.

Hope this helps