[Nikolya Gousteau]

Hi John!

Thank you a lot for suggesting this solution. However, several things remain unclear for me:

1) When we pick-whip the Null position to CC Sphere offset, we want the Null to be “pinned” to the center of the Sphere, right? However when I watch your composition, this is not exactly so…
Here is a link to the rendered “Example project” comp from your project:
link
(I’ve just added a red circle to visualize the Null, and set the opacity of Sphere to 50 to reveal the Null)

2) Even when we turn off the animation of Sphere offset, if we try to place the Solid exactly on the surface of Sphere, there is a problem. Here is a link to a video-description of the problem:
link
To place the Solid on the surface, I just set its Z-position to -R, R being the radius of Sphere (note that Solid is pick-whipped to Null so its position is relative with respect to Null). What is wrong in this case?

Thank you in advance!

P.S. Here is a link to the project file: 4210_solutiondiscussion.aep.zip

[Nikolya Gousteau]

Unfortunately not yet:)

Initially I thought that the perspective used by CC Sphere differs from the perspective used by AE… I tried to change the settings of camera, but it didn’t help.

It is interesting that the rotation of the point on sphere appears to be tracked well this way. The only problem is distance from the point to the center of the sphere…