Problems with moving/spreading fire

[visionsbox]

Hi,

I am trying to to simulate a line of fire (e.g like a burning line of fuel) that slowly moves forward on a specific surface. What i did, is to set the id on the faces i want burning to 1 and told the source to only emit on those ids, then animated the simulator, so the fire can move in the direction i want. So far everthing works as it should - but it doesnt really look very nice.
First of all the fire gets cut off at the edges of the simulator which just doesnt look realistic. I've played around with the discharge modifier but couldnt find a way to prevent this from happening no matter what i did.
Secondly i get jagged edges on the sides of the fire where the faces end (but it's not the way the faces are selected that make this happen). I've posted pictures of both problems, so you know what i mean.
Are there any settings I am missing i could try? Or is there a general better way to simulate what im trying to do? I'm still very new to phoenix

We are working with 3ds Max 2018.4, VRay 3.60.04 and Phoenix FD 3.10.00.
Any help will be appreciated!

PS: How come I can't post in any of the other sub-forums?

[Svetlin.Nikolov]

Hey,

You could use the Fade Out option in the Rendering rollout to reduce the fire opacity near the grid borders.

You can suppress the grid artifacts near the emitter surface using a similar rendering technique - from the Volumetric Options window, you can reduce the intensity of the fire or the opacity of any smoke near a geometry if you enable Modulate and plug a V-Ray distance tex in either the Fire or the Smoke Opacity rollouts. The idea is to have the distance tex black near the geometry and to have it white away from the surface.

Hope this helps, cheers!

[visionsbox]

Thank you for your answer, this helped a lot!