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Use motion tracking data to generate a path/stroke – how?
I’ve googled the heck out of this and asked more knowledgable colleagues, but continue to draw a blank.
Ive tracked the motion of an object, and and want to generate a stroke along the motion-tracking path, as the object travels. I.e. it travls from A to B and I want to reveal the path of where it has already been…. a bit like hawkeye in tennis!
Now I know I could just draw the path by hand, key-framing it, but as I have a dozen shots to do this to, I’ looking for a quicker way, hopefully using the motion-tracking data.
Any help will be greatly appreciated.
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8 Replies
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That’s a darn good question. It can be done somewhat easily in C4d and probably other 3d programs, but I’m not sure about in Ae. Maybe using trapcode 3d stroke and/or echospace? Sorry I couldn’t be much help…
Tim
Apple XRAID, XServe, 2008 2×3 GHz Quad-Core MacPro, Macbook Pro, XSAN, Dell Studio xps PC’s
FCP Studio (7), AVID Media Composer, Adobe Production Premium, Maxon Cinema 4d, AJA Kona 3, Flanders Scientific Monitors, Panasonic HPX250’s, Kessler Crane, Glidecam…..
Beer fridge fully loaded. -
Hi Dave, it’s a 2D (x & y) motion track. I’m hoping that makes things simpler!
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Yes, it is.
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Dave, you are a gentleman and a scholar. I will give this a go tomorrow – it certainly looks like a robust solution. Many thanks.
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An alternative suggestion to Dave’s method: If you already have your tracking data applied to a Null, then you could use it as an emitter for Trapcode Particular, with no copying or pasting of data necessary. Just add a new solid with Particular, link the Emitter position to the Null, and then tweak the particle size to taste. If you set all the velocity and physics options to zero, the particles will stay where they were emitted and draw a line. If you want the line to fade off, play with the settings for particle life time and opacity over life.
Matthew Keane
Freelancer based in Paris, France
– Motion Graphics, Video Editing & Effects, Watchout Programming & Live Operation. -
Dave, you are a gentleman and a scholar. I will give this a go tomorrow – it certainly looks like a robust solution. Many thanks.
EDIT – this worked a treat – many thanks for such a clear set of instructions.
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Great suggestion, but alas I don’t have trapcode. It might be of use to others though should they find this thread when they’re stumped.
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That was an outstanding solution. Is there a way to make the Write-On path’s visibility persist past the last brush position keyframe?
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