I need a 3D orientation (from 2 positions). Motion capture
Posted: January 9th, 2007, 5:20 pm
Hi everybody,
I'am a regular visitor of aenhancers.com.
I would need an expression that apply a 3D orientation to a layer.
I'm working on a "3D Motion Capture at Home" project.
I shot myselfs with 2 cameras, then, with After Effects, I track several part of my body : hand, shoulder, neck, feet,...
I get 3D positions value, from each of the 18 points of my body.
Here is the deal.
I NEED to "know" the value of the rotation of my arm. My arm is liked to my bend's position,... and should rotate in direction of the wrist...
I suppose it's just a trigonmetric stuff,... i can do it in 2D, ...
I'have found at "jjgifford.com" some expression that helped me with trigonometrics stuffs,..
I'have found at "aenhancers.com" a topic like "orient a 3D layer with 3 points",..
These topics are great, and i think that i just need a mix of their expressions,... but i can't find a solution so far.
If my request is not clear enough,.. you can see an example of what i'm trying to do : a 3D mocap at Home. http://starbacon.free.fr/krutyblog/inde ... er-effects There is a video that shows what i did, and.. you will see what kind of problems i had.
kruty
I'am a regular visitor of aenhancers.com.
I would need an expression that apply a 3D orientation to a layer.
I'm working on a "3D Motion Capture at Home" project.
I shot myselfs with 2 cameras, then, with After Effects, I track several part of my body : hand, shoulder, neck, feet,...
I get 3D positions value, from each of the 18 points of my body.
Here is the deal.
I NEED to "know" the value of the rotation of my arm. My arm is liked to my bend's position,... and should rotate in direction of the wrist...
I suppose it's just a trigonmetric stuff,... i can do it in 2D, ...
I'have found at "jjgifford.com" some expression that helped me with trigonometrics stuffs,..
I'have found at "aenhancers.com" a topic like "orient a 3D layer with 3 points",..
These topics are great, and i think that i just need a mix of their expressions,... but i can't find a solution so far.
If my request is not clear enough,.. you can see an example of what i'm trying to do : a 3D mocap at Home. http://starbacon.free.fr/krutyblog/inde ... er-effects There is a video that shows what i did, and.. you will see what kind of problems i had.
kruty