smoke pop on creation

[stevesideas]

I have an odd issue with Phoenix when it creates the smoke. I'm using a noise map with mask (radial grad) for distribution but it kind of pops as it creates it. Is there a way to break up the distrubution inside Phoenix ? I did respond to another thread about creation of the smoke when it starts moving (I guess above a certain velocity threshold) but not sure this can be done. It kind of looks odd at the moment.

Any help appreciated. Thanks

[stevesideas]

I tried changing the volumetric opacity for the smoke to be based on speed but I get strange results straight away in the viewport.

[Svetlin.Nikolov]

Interesting - try to move the leftmost point on the graph more to the right. You should have values of the curve above zero only for the faster parts of the simulation, so you should have a lump in the curve in its right part.

[Svetlin.Nikolov]

It's also possible that the turbulence is too strong and these velocities are caused by it - you could try turning it off just for the test.

[stevesideas]

I'll try both those. Thanks

[stevesideas]

I deleted the turbulance and set the opacity point on the left further right and re-did the simulation but it is looking odd...just lines of smoke across the left hand side of the simulation.

[stevesideas]

This is the kind of result I'm getting now.

[Svetlin.Nikolov]

Strange - if there are no other helper in the scene, the only thing that could break it I can think of is open geometries or geometries with inverted normals - you could substitute the ground plane and the helicopter models with simple cubes in order to check if this is the reason.

[stevesideas]

I've actually excluded all the geometry from the simulation apart from the ground plane that is. I'll check if the ground plane is the issue on Monday. Cheers

[Svetlin.Nikolov]

Hmm, if this does not help, please send the scene over if possible - we should take care that such behavior does not happen, whatever the reason is.

Cheers!