How to create certain drawn line effect... Help Appreciated!

New Here ,
Mar 24, 2022 Mar 24, 2022

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Hello all,

I am fairly new to after effects and this particular effect I am trying to get is driving me crazy... it seems like there MUST be a more simple way to do this! What I am trying to do is simulate a line being drawn around a spherical object while the camera pans around it. I am a 3d animator and only just got into actual video editing as someone else has always done that part... I have posted a link to a medical animation video that pretty much does exactly what Im trying to do. starting at the 37 second mark and ending at 43 seconds... (I am brand new to the community so if posting links is against rules, please let me know, but this is the only way I know to accurately describe what Im trying to do). 
The link is https://www.youtube.com/watch?v=bfcX0ng_PlM

I know how to do the trim paths to simulate the line being drawn. I just dont know an efficient and effective way to get it to stay in one place as the camera pans. The footage I'm using is of a 3d head with camera panning around it. (Rendered it out of maya) I tried the 3d camera tracker and, while some of the points are fairly accurate, I don't know how to use it to make my lines stay at particular point on head... any help is appreciated... is there something or feature I'm overlooking because I'm a new to AE? And, just in case anyone is wondering, no, there is no easy way to add this effect to my animation in Maya before rendering. (At least not without plugins and I dont know of any) I really wish there was...

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New Here ,
Mar 24, 2022 Mar 24, 2022

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Oh my gosh... I just figured out how to do it in 3d software and it was so incredibly simple the whole time... that being said, I'd still love to know if there is an easier way to do it after effects as I am excited to learn how to use AE and add it to my skill set!

 

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Adobe Community Professional ,
Mar 24, 2022 Mar 24, 2022

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Lo que yo habría hecho es hacer tracking de transformación con Mocha, aplicaría los datos de track a un Null Object y luego pondría la línea punteada como hija del Null Object. Pero qué bueno que lo resolviste en la aplicación de 3D, así todo es más sencillo para ti.

 

Saludos!

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