Why do smoke particles emit without Emitter assigned?

[Truffi]

Hi

I noticed when tweaking a simulation, that in a second run Phoenix FX emitted on objects that were not assigned in sources anymore.

So I ended up deleted all of my sources in the scene and started the Simulation once again. Still, particles kept emitting inside the cage.

Why is it doing that? There is no source, so not even an emitter object assigned, still inside the Phoenix FD cage particles emit from the shape of the object that was assigned in the source I deleted.


Does PhoenixFD add up discharged particles with every new simulation?
I got velocity checked, does it have to do with that?


Many thanks in advance for clarifying!
Chris

[Ivaylo Katev]

can you attach the scene?

[Truffi]

Sent a dropbox link to you via PM.. Thanks for taking a look!

[Ivaylo Katev]

ok, i got the scene, started simulation, seeing the setup it produces what i was expecting, what actually you are trying to do, and where it goes different?

[Truffi]

In the scene PhFD-Source-Problem...max - when simulating on my machine - the cage fills up with smoke inside the groundbox. The box is not assigned as an emitter object. There are no PhFD sources in the scene. So there is no chance to control what is going to happen inside the cage.. I wonder why the smoke grows. I wonder why it appears at all, since there needs to be an emitter to generate smoke, as far as I understand..

Also, in the second scene PhFD-Source-WhenItWasStillWorking, when the PhFD source objects get deleted, no particles are generated when the simulation is started. The outcome is different, despite the setup is the same like in the first scene file. So what is it that makes the first (problematic) scene behave so different?

[Ivaylo Katev]

i see
well, by default phoenix interaction is in exclude mode, this means all the objects not specified are interacting with the simulator.
and if you have a source helper interacting with the simulation, all the geometry put in its object list works as source, even those marked as disabled for interacting. the geometry disabled for interacting really does not interact with the simulation, but it still can be used as a transparent source (see the if not solid parameter)

[Truffi]

That is clear to me. Maybe I wasn't precise. What I found irritating is the fact that smoke is generated without an emitter object inside the cage and there was no source helper at all in the scene.
I just tried simulating the same scene on a different machine with Phoenix FD version 2.2 installed, and the outcome was different. There it worked propperly. No smoke appeared. No settings were changed, the input is set implicit. I reduced the scene to the box and the cage, so pretty unlikely I did not oversee something.
Anyways, starting from scratch always helps. Thanks again for the kind support.

[Ivaylo Katev]

there are four source helpers in the scene, if you mean that the source helper is deleted during the simulation and it continues to emit, yes there was such a bug at some time, but it's fixed now.
what version are you using?

[Truffi]

2.2 which I thought is the latest.
The four source helpers were not deleted during the simulation but before. The simulation started. After frame 4 the smoke appears. Absolutely no source helpers in the scene..
On another system with a second PhFD license (same version), in the same scene the smoke did not appear when simulating. Like the smoke was ghosting around in some kind of input loop..

[Ivaylo Katev]

2.1 is the latest official, 2.2 is not officially released.
i suppose this bug is the above mentioned one, and is already fixed.

[Svetlin.Nikolov]

Yup, @Truffi, you can check the version and revision in the about box and you may post them here

[Truffi]

You were right about the version number..

I am using
Version: 2.1.1 Revision: 23258

Thanks for clarifying.

[Svetlin.Nikolov]

Ah, so that's it - you're using a version from July, so the bug in question is most probably the one that got fixed some time ago.
Please check one of the latest nightly builds - you can ask the support for access if you don't have.
And please tell us if the issue persists

[Truffi]

Ok, I made the request, I just hope it won't cause complications with my renderfarm.