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TOPIC: Tracking rotation

Tracking rotation 31 Mar 2016 14:29 #74832

  • daniel.larsson
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Hi there!
So I have this clip


My vision was to use the attached image around the wind turbine so the line in the image almost touches the tips of the wings. I wanted the image to follow the perspective and position of the turbine so the effect is like a 2d image with a 3d effect. I was trying to use core melt's tracks for this, but I think I am giving the plugin a very hard time.

Can anyone please point me in the right direction to get this done?
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Tracking rotation 06 Apr 2016 08:17 #74994

  • Karsten Schlüter
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maybe I'm not familiar with the in-depth options of TrackX, but afaik, it does NOT support 'depth'/z-tracking... it 'fakes' perspective by resizing (the skier example on coremelts site...), but in your case that is real rotation..

but…
because the movement is so clean and steady - have oyu considered goo' ol' manual keyframes? ;)

look:


centered overlay with playhead in the middle of the clip, keyframesON for distortion, put playhead to start & apply distortion, put playhead to end apply distortion.. done.... 3 keyframes..

ok, it 'hovers' a bit, due to distance changes... maybe THAT can be TrackXed, by picking e.g. the propellers housing as reference, and let TrackX 'scale' your graphic...

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Tracking rotation 06 Apr 2016 15:27 #75001

  • BenB
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TrackX is "planar" tracking, it needs a single flat plane to track. Those blades are individual planes. If it were one flat plane, it would match perspective quit well. I do it all the time.

You can use TrackX to track the center of the turbine, and apply that to your overlay image. Then keyframe Distort parameters to fake the perspective.

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Tracking rotation 07 Apr 2016 10:24 #75024

  • CoreMelt
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hi, unfortunately this is a very hard shot for trackX because there is not enough detail on the blades to track it as one single plane. If it was a solid object, eg a big circle with some texture it would be easy to track.

The best solution is to do as karsten suggests, keyframe the rotation manually and use trackX for the x.y float by tracking the centre of the windturbine

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Tracking rotation 07 Apr 2016 10:31 #75025

  • daniel.larsson
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Thanks for your replies! As I was suspecting this wasn't a problem with an easy solution :) I will try the x and y tracking with trackx and keyframes for distortion.
Thanks!

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Tracking rotation 07 Apr 2016 11:47 #75029

  • BenB
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Isolate the center of that fan, where the blades come together, it will track just fine.

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