Home made motion capture

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I've been looking into motion capture for some future animation work i'll need to do and i couldn't find any "freeware" "bedroom studio" type of motion capture apps. Does anyone know any free ones?

Regardless, i figured out how to make one. By setting a camera at a known position in 3d space (ie on a desk) we can measure by hand the vertical and horizontal angles in relation to the floor and compare them to 2d coordinates on the picture of the screen. Then we can compute 3d projection angles from a 2d image, knowing where the camera was. Putting a second camera will give us a second set of projection lines and where they cross this may give us a point in 3d space. These projection lines are imaginary lines which can be made in 3d using Blitz for example, and they connect the camera lens to a certain bright point on a mocap suit (for example). I guess you know what im trying to say. You'd just need to empirically measure the angles and put that in as a relation between the 2d coordinates on a video.

So incidently i saw the CSP thing by jfk on bb.com homepage, and i'd like to say that looks very useful in my case. Not that i'd need to do it NOW, but in a month or two when i continue building my "3d character animation" portfolio i may go ahead and do something like this.

Question #2:
Without even searching for it, is there a currently existing and suggested method in blitz3d or bmax that would detect bright spots (1 or 2 pixels) on a generally dark video, and track them?