Speed By Surface

[emil_vfx]

Hello everyone!

I am trying to create smoke, coming out of surface (cylinder with deleted top & bottom, defined as source), but the smoke should come out perpendicular out of the surface. Unfortunatelly it doesn't work: Smoke is being emitted also upwards and downwards... I used also a map to clamp the area for the smoke creation and the directional speed, but no big change...

Thanks!
Emil

[sitnisati]

Hello,

Kepp in mind that, since there are no caps, smoke is probably emited inside the tube as well and it will also be
emited from the edges of the tube.

Regards,

Kresimir

[emil_vfx]

Thanks Kresimir,

But I have limited the emitter area by a gradient map. Nevertheless it is still emitting non-perpendicular...

Greets
Emil

[Capitanred]

you could do a little workaround if you don't find a soultion.

just add your cylinder into ffx, and make it solid. this way no smoke should come out of this area. and if there is allready smoke inside this area, you can copy the cylinder, and apply a matte/shaddow material to it with apply atmosphere at object depth enabled.
just an idea

hmmm...i think i missunderstood the question...

[emil_vfx]

@ Capitanred: It' s all about the direction of the smoke moving. If you are familiar with the Speed by Surface Operator, you might understand what I am searching for ;-)

[sitnisati]

Hello,

I have created a cylinder without caps, set gravity, buoyancy and temperature to 0 and set Object source Extra velocity to 3 and
everything went fine.
Maybe you have buoyancy and gravity left that cause smoke to rise fall.

Kresimir

[emil_vfx]

Hey, thanks.

It seems I had some strange file (maybe corrupted) that caused FFX not to simulate properly.
I recreated the scene with new emitter and merged objects and it works! :-)

Greets
Emil