Latte Macchiato?

[Ihno]

Hey,
If you move the fill simulator downwards so it won't cover the top part and you move the camera you will notice that there is hole inside of the smoke. I have attached a screenshot how this looks.

Cheers,

So I could maybe make this work I just need to fiddle with the values. Thanks!

How about the oscillations and the bumpiness of the liquid geo? Can I get around that somehow?

[georgi.zhekov]

Ah, sorry I missed that - you will need to enable the cutter geometry for that. So pick the glass as a Cutter geometry and turn on the the Invert Cutter.
You can try using the Isosurface rendering mode as well as the Mesh mode sometimes might produce artifacts.

You can find more about what each options does here - https://docs.chaosgroup.com/display/...ing-Parameters

[Ihno]

I think I found a bug.
There are two intersecting liquid sims (milk and "foam" in my case)
I used the cutter for cutting off the intersecting parts from the foam. But it didn't look nice, so I disabled the cutter and tried the distance tex instead.
The milk simulator was still in the selection box for the cutter.
I used a distance tex with the milk as distance object and put it in the opacity channel of the foam material.
When I hit render max crashes.
And renders again when I put another object in the selection box for the (disabeled) cutter on the foam.

Ah, sorry I missed that - you will need to enable the cutter geometry for that. So pick the glass as a Cutter geometry and turn on the the Invert Cutter.
You can try using the Isosurface rendering mode as well as the Mesh mode sometimes might produce artifacts.

You can find more about what each options does here - https://docs.chaosgroup.com/display/...ing-Parameters

I settled for the clipper for now. Since it isn't producing artefacts and the isosurface mode is dead slow.

[Svetlin.Nikolov]

Hmmm, do you still have this scene? I tried reproducing the same setup here, but it seems to hold up without crashing

[Ihno]

Ok, I'll sent it to the support.
Im on Max 2020 (latest sp) Vray 4.30.01 and Phoenix FD 3.14.00 btw.

[Ihno]

Here is the ticked ID 257-566-0331 
It crashes on my end when rendering.

I'm trying to simulate the fake foam as highly viscous liquid which looks pretty good.
Now I'd want to use the milk simulation I did before (which fills the glass) as collider and emitter for the fake foam. It works as emitter, but the liquid gets cut by the milk as it moves. Is there a way to let it collide properly?.
The other option would be to animate a simplified collider for the surface. But I'm lazy... Also, I don't want to do that again when I have to change anything on the underlying milk sim.

I found a solution for this in case somebody else needs it.
I put a ortographic cam above the liquid sim and rendered a zdeph channel which I then used in a displace modifier.
That wouldn't work in all cases but for me it worked like a charm.

[Svetlin.Nikolov]

Hey, just gonna ping you here as well - we caught the crash and fixed it - I see you are still using Phoenix 3, so I picked it to the Phoenix 3 nightlies and run a new batch of nightlies - they should be ready about an hour from now and you can grab one with the fix Please ping us in case there are any issues.

Cheers!

[Ihno]

Thanks for your great work!

[Ihno]

Hi,
Is there anything I can do about the mb related fade at the top of the simulation? Like somehow suppressing the velocity channel in that area?
Or do I have to render twice (with/without mb) and comp it?

[Svetlin.Nikolov]

Wow, is the motion blur this long? Is this at the last moment before the liquid stops being emitted, or is it this way throughout the animation?

Unlike other scenarios, I don't think we currently have tools to hack the motion blur in a certain area at render time, so it might need handling during simulation. Since the fluid cannot be emitted standing still and be left to fall down, in which case you would not be able to get a straight vertical shape of that is not thinning out while going down, you might have to place the emitter higher and have the liquid flow through a longer path, going outside the render image.

In Phoenix for Maya there is a concept for a velocity texture, which can replace the motion blur from the grid. In order to get the same result as the regular motion blur, you could use a grid texture to route the grid velocity into the velocity texture slot, and in order to suppress it towards the top, you could multiply it by a gradient. This is not yet available in 3ds Max though, and would not be too quick to port...

[Ihno]

It's half-way through the animation.
There is much milk coming out since It needed to be faster then the real thing.
I think that's why its so long.. I will try to copy the sim, disable mb, on the copy and use the distance tex to hide unhide parts of the liquid on both. The transition could take place in the foam so I don't have to fiddle that much with the settings to make it invisible.
I should have enough ram across my farm to do that..

I can't render it on GPU anyways, since neither the isosurface mode nor the clipper in mesh mode is supported (which is a shame).

[Ihno]

I'm having problems with the grid tex not being loaded some times.
Happens only at the beginning of the render. Which is strange... after two tests I'm under the impression it happens on the first or second frame a node picks up and then everything runs smoothly.
It's not the fault of the caches since it renders fine on a second try.
Nothing else is not beeing loaded. Check for missing assets is checked.
It also doesen't seem to be related to the computer. Nodes that rendered wrong frames also rendered right frames.

Is this known? Should I send you a scene?

[georgi.zhekov]

Hey,

Which versions of Phoenix and V-Ray are you using? We did fix some similar issues at some point. Can you try with a latest nightly?
If it still reproduces, send over the scene and we'll check it.

Thanks!

[Svetlin.Nikolov]

Hmmm, very interesting, maybe something invalidates the texture, probably in case it's plugged in some materials or in some other nodes. If possible, please send a scene over so we can catch it.

Thanks a ton!

[Ihno]

Hey,

Which versions of Phoenix and V-Ray are you using? We did fix some similar issues at some point. Can you try with a latest nightly?
If it still reproduces, send over the scene and we'll check it.

Thanks!

I'm using the latest official release (of phx3) for max 2020 and vray next. I'm half-way through the shot and two days render time went in there already. I'm a little afraid of installing a nightly midway through a render.
I'll first let it render through and re render the broken frames before testing that.

Hmmm, very interesting, maybe something invalidates the texture, probably in case it's plugged in some materials or in some other nodes. If possible, please send a scene over so we can catch it.

Thanks a ton!

Could be, I had an exhausting fight with that scene and tried everything. And yes, it's used as opacity map in two materials.
I'm not at the office tomorrow. I'll pack it up for you on monday.