How do I show the motion path in playback in AE?

[Audrey Beeley]

Hi Dave,
Thank you for responding so quickly.
That’s a shame! I’ve been doing the window grab option, but it doesn’t look quite as vivid in the export.
For an art installation I’m doing a video of some fish in a tank, which I wanted to map the motion of, then show the motion path in the exported video as if I had animated them.
Thanks,
Claire

[Audrey Beeley]

Hi, Here’s a terrible video I took of the first stage I was at yesterday, but it’s enough to give you an idea of what I’m looking for; https://vimeo.com/217045119/441b829f6a
The current version now has a tiny red square that follows the motion path as the fish does, and there are also multiple paths showing the motion paths of other fish.
Cheers,

Claire

[Kevin Camp]

the write-on effect could create a trail of dots that follow the motion path.

• select the position property of the layer that is tracking the fish and copy those key frames
• add write-on to either a new comp sized solid (or the footage itself, but I’ll describe the new solid method).
• twirled own the layer properties to get to effects>write-on>brush position, select that property and paste the position keyframes from the other layer.
• in the ‘paint style’ property set it from ‘on original’ to ‘on transparent’

as you scrub thru the timeline, a line should follow the motion path of the fish.

adjust the brush spacing property to make it a solid line or a series of dots.

Kevin Camp
Art Director
KCPQ, KZJO & KRCW