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Newbie - Emitter Object Tracking

Posted: Sun, 27th Dec 2009, 1:43pm

Post 1 of 4

Dazzy1975

Force: 1825 | Joined: 22nd Dec 2009 | Posts: 12

VisionLab User

Gold Member

Hi I am new to the world of FXhome, but I am loving getting to know the program (I own effects lab and composite lab). However, I am wondering is there a way to track an object so it looks right with a bit of camera shake.
What I am trying to do is add smoke to a chimney, but the only way I can get it looking at least half right is to move the emmitter frame by frame. So I am wondering how I can get the emmitter to stick to the object (ie chimney) without having to put it in the correct position each time the camera moves.
Thanks in advance for all your help, and hope you are all having a great holiday.

Daz smile
Posted: Sun, 27th Dec 2009, 5:52pm

Post 2 of 4

spydurhank

Force: 1956 | Joined: 24th Jun 2008 | Posts: 1357

VisionLab User VideoWrap User FXpreset Maker Windows User FXhome Movie Maker

Gold Member

Unfortunately you have to do it frame by frame for now as there is no other way to motion track in the lab products.

This may or may not be of some use.
http://www.vimeo.com/6352007

I haven't tried using this concept to see if it works on any of the effects engines... not yet but I will attempt it soon.
Posted: Sun, 27th Dec 2009, 6:09pm

Post 3 of 4

Axeman

Force: 17995 | Joined: 20th Jan 2002 | Posts: 6124

VisionLab User VideoWrap User PhotoKey 5 Pro User MuzzlePlug User PowerPlug User PhotoKey 3 Plug-in User FXhome Movie Maker FXpreset Maker MacOS User

SuperUser

There is unfortunately no way to automatically track an object. Which leaves two options to solve the problem:

1. Manually track it to follow the movement of the frame.
2. Don't shake the camera.

Not ideal, but those are the options you have. In this thread, spydurhank provides a video tutorial showing how to accurately track objects to a moving camera, using a better technique than just moving it each frame trying to get it in the right spot. If I recall, it works on stock footage or imaghes, rather than effects though. It might be able to be modified to work with the effects engines though, I don't recall for sure.
Posted: Sun, 27th Dec 2009, 7:38pm

Post 4 of 4

spydurhank

Force: 1956 | Joined: 24th Jun 2008 | Posts: 1357

VisionLab User VideoWrap User FXpreset Maker Windows User FXhome Movie Maker

Gold Member

Hey Axeman... I just tried it and it's a no go. sad
It would have been cool to be able to do that with the effects attributes though. biggrin hint, hint.

He should be fine with just manually moving the emmiter but if not... the only thing I can think of, is to render out the particle effect by itslef with an alpha channel and then import that rendered video clip back into Effectslab and track that into the shot. It's a little time consuming and bothersom but it should work fine.