bad fuel

[magilla]

how do you have a flaming ball emitting 3000 temp in a load of fuel that won't freakin burn!!!!!!!!!!

[Svetlin.Nikolov]

Hi, we would be able to tell better if you attach a shot with your settings, or the scene where the issue occurs.

[magilla]

yeah it was rhetorical - not really expecting help, just venting



I am trying to get a slow creep flame ignition across a floor. I basically had a flame being swamped by fuel yet not igniting - or exploding into a giant fireball. I have been messing with the energy and propagation without much luck. I assumed I needed the energy as low as possible to avoid exploding and the propagation would control the speed of the spread. Not sure this is correct though.

The image shows the flame sitting there being gradually engulfed by more and more fuel without igniting until after 200 frames it just explodes.

[magilla]

Another issue is the flame (when it does burn) is way too big. It has a lot of nice detail so the scale is ok but it is enormous, flaming out of the top of the 5 metre grid. I am emitting fuel at a value of 1 with a discharge of 0.1 from a plane in brush mode. Scene scale at values 1 through 10 makes no difference. I have set the cooling higher to staunch the flames but it also puts the fire out.


edit: energy up - Propagation down - got it

[Ivaylo Katev]

the natural propagation of the ignition can't be too slow and in general is poorly controllable , my recommendation is to not use it, but to use mapped discharge with animated texture. the easiest way is to use the vray distance texture and hidden object that does the movement. you can move the object as slow as you want, regardless of the fire quality.

[magilla]

yeah I was using an animated map, but the fuel was just emitting and not igniting, so the fuel was getting way ahead of the fire - then explosions. You are right though, the propagation (and energy) is very hard to control, I thought I had the right settings but any tweak causes it to do something different.

What is concerning me the most now is the height of the flames, I can't get them to not be enormous!

[Svetlin.Nikolov]

Sounds like we will need the scene, there's too much weird stuff going on. Is it possible to attach it or send it to support?

[magilla]

If I remove the fuel altogether and just use temperature I can control the height with the emission of temperature, so I've given away the fuel for the moment. If I can clean up the file before I figure out what's going wrong I'll send it. Cheers!

[Ivaylo Katev]

the fuel is useful for some kind of explosions, but if you just wants propagating fire, do not emit fuel, emit just a hot air.

[Svetlin.Nikolov]

Yup, the fuel has limited applications in Phoenix, and it's very rarely used, so there might be some hidden issues. If you are able to drop us the scene, we will be happy to figure it out