Wed May 04, 2016 2:21 pm
I'm new to Fusion so I'm curious as to this as well, but will add...
Blender is free and has a 3D tracker. Instead of moving the object it moves the camera. Try that instead maybe? You can export the camera info from blender though I've never tested importing into Fusion.
Fusion does have perspective tracking, meant for 2D work, so instead of connecting the object to the tracker, you could merge 3D the cube with a camera and then set the camera to be connected to the tracker and not the cube, then render 3D the cube, and overlay it on the video of the cat. Apologies if this is mis information, but that's how blender does it, by attaching it a camera and not the object.
That way if Fusion only does 2D tracking, if the video moves left and right, if you attach the cube, the cube would move left and right but not the perspective. Attaching the camera to move left and right on a 2d plane WHILE FILMING a 3D cube, would yield perspective - though you'd have to have stabilization tracking so the camera moves in the opposing direction and set the focal length to match the video.