in need of a tip

[Frank_red]

Hi,

I need a bit of help with a work I'm doing.

I'm suppose to create a small cloud of smoke and follow it while it goes up.

I managed dissipation and turbulence, but the simulation start to slow down after 60 frames, and cannot continue after 90 frames....it freez up.

the scene is simple, a simple emitter that during 3 frames sends out smoke with 30 density.

then the gravity does the job to follow the camera that was tracked.

I have 200 frames, but I cannot get passed the 100....... quality is about 3 and itinerations 30....not that heavy.

any idea or tips?

Thank you.

Francesco.

[FabianB]

Hey Francesco,

that's really hard to answer without seeing the scene, but if the smoke slows down that's usually a sign that there isn't enough temperature to drive it.

So here are a few things you can try: Emit more temperature from your src and don't turn it off, kill temperature dissipation, increase heat production, create a second simple src that only emits temp and animate it with your smoke.

Hope that helps,

Fabian

[Frank_red]

FabianB,

thank you for the tip, I think the second emitter is a very good solution.

Fra.

[Frank_red]

One more question on this topic.

I finally have the smoke moving where I want, but even with dissipation at 0 it disappears too early...

I changed opacity and fallof, but still disappearing too early.

Is there a way without re simulating or am'I obliged to increase density and restart simulation?

Thank you.

Fra.

[jrand]

This is a common mistake, people think because they are done emitting smoke/fuel/velocities from their source that the source is no longer doing anything, when indeed it is. If you don't move/remove the source from the grid still acts like a source by continuing to influence the grid either with velocities or temperature or even a void. Sources always affect the grid.

Move it out of the way if you are done with it

I maybe assuming that your source is encompassing or close to your emitted smoke, as I have no idea what your scene looks like.