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Smoke help! -Controlling particles [ANSWER]

Posted: Mon, 11th Sep 2006, 1:45pm

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Underdog Productions

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Hi there. Just been doing some effects tests before i go out filming. The effect i want is a fire ball coming out of the sky, hitting the ground and then the ground burning, pretty similar to the one that plays on the reel on the home page.

Along with the mighty Solthars fire plugins and some lens flares, I have been using the 'Fireball with smoke' and 'Pillar of Smoke' presets, and it's these last two that I'm having a little trouble with.

The problem is with the trail length and getting it to start and stop. So these are my two questions.

With regards to the fireball, how do I get the smoke to stay where it is but fade away once it has hit the ground. Because at the moment there is a sexy streak of fire and smoke across the sky, then as soon as it hits the ground it dissapears, rather than linger in the air and fade.

And with the pillar of smoke, I can't seem to get the smoke to start from nothing and slowly rise into the air as the fire burns. At the moment, as soon as the effect starts there is a column of smoke straight away, and it just appears!

Hope this is clear enough. Just ask if you need screen grabs or any further explanations.

Or if this has been answered anywhere else, or if there is a tutorial for the fireball clip on the homepage, a link would be appreciated.

Cheers

Andy
Posted: Mon, 11th Sep 2006, 3:08pm

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Pyromarius

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Why don't you use this fireball?

You can use for example "Gentle smoke" with some masking as the smoke trail. Then you can decide how long you want it to be in the air, how thick you want it, and more.

Or you could make the smoke by yourself. I think that would be the best, because then you can make it just as you want it.

Pyromarius
Posted: Mon, 11th Sep 2006, 3:56pm

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Underdog Productions

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thanks for your help but it doesnt really answer my questions. these are the presets I'm using, I just need a bit of guidance with the settings.
Posted: Mon, 11th Sep 2006, 6:04pm

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Pyromarius

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I know I didn't answer your question very good, but I meant that you may should consider to make it in another way. To make it in an easier way doesn't mean it gets worse.

I'm submiting a preset today called "smoke trail", inspired by your post, maybe you can use that. If they likes it, it will probably appear in the preset library in a few days.

Pyromarius
Posted: Mon, 11th Sep 2006, 11:27pm

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Axeman

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To get the smoke to stay put as it is emitted, you need to Free it from its Origin. That control is at the bottom of the Position section of the Emitter attributes. Then play with the particle lifetime to get it to hang around for a while. Make the effect the length that you want the smoke to last, but turn off the emitter (with the on/off switch) at the point when it hits the ground. Smoke will stop emitting at that point, but if the effect continues, then the smoke already emitted will live out the remainder of its lifetime, thus hanging about in the sky in a lovely trail.
Posted: Tue, 12th Sep 2006, 8:38am

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Cogz

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If you wanted all the smoke to fade out, you could add a "transparent" grading filter to the smoke effect, then tween the transparency over the time you want it to fade out.
Posted: Tue, 12th Sep 2006, 9:18am

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Simon K Jones

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As for the smoke pillar, it sounds like the emitter 'on' keyframe is set back from the start of the effect object itself. This means that it starts emitting particles before they are 'visible' - resulting in a full pillar of smoke right at the start.

To change this, simply drag the emitter keyframe to the first frame of the object. That way it won't start emitting until the effect object is reached.
Posted: Tue, 12th Sep 2006, 10:28am

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Underdog Productions

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Thanks guys. You've sorted me out good and propper! smile

Not sure if you're familiar with the film but it's the opening of 'Undead' I am going for.

http://www.apple.com/trailers/lions_gate/undead/large.html

Thanks again

Andy