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I have footage that I've Camera Tracked and created a Null + 3D Camera from. I drew a shape with the pen tool that fits the perspective I need. My goal was to have that shape parented to the null and follow the footage. However, the parenting seems to have no effect, and enabling the 3D layer is only thing that affects the shape I created. But even then, the shape is moving along its path much faster than the footage (and it's tracked points). See video for reference, and a screen grab of the Comp layers.
Help!
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Making the shape layer a 3D layer is the only way a camera will affect it as 3D cameras only affect 3D layers.
My expectation is that your shape layer is positioned incorrectly on the Z axis. Think how objects closer to the camera move faster than those in the background. Your tracking data may be correct but if you put the shape layer too close to the camera the speed will appear incorrect. Try pushing it back in z-space to see if that helps.
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If you did not set an origin and ground plane and then set a solid and a camera up using the same points and verify that the origin and ground plane is accurately placed in the shot then you left out one of the most important steps in Camera Tracking. I'm guessing that the points you chose for your target did not line up with the ground plane you needed. There is also a fairly significant valley in the shot so a flat 3D layer is not going to track very well because the perspective changes are not the same for the high and low parts of the shot. You either need a separate plane for each surface or you need to handle the shot entirely in 2D. Personally, I would motion stabilize the shot so the middle of the valley did not move then hand animate a shape layer to fit the changing geometry, then add a null, tie the null's position property to the stabilized footage Anchor Point with a simple expression, then parent the animated shape layer and the footage to the null to put the camera move back in the shot and add the motion to the shape layer. I think you'll have better success than trying to match up a bunch of 3D layers to the multi-plane surface you are trying to outline with your shape layer.
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Hi Danl Durall,
Did you solve this issue with the help of our experts? Let us know.
Thanks,
Kevin