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Three-Point Alignment
In the standard coordinate system setup, you click on 3 trackers to set up a coordinate system: an origin, and X-axis, and a point on the ground plane. You can do something very similar to align a mesh to three trackers.
In this case, you set up three links between a tracker and the corresponding vertex on the mesh. You must set the mesh as the edit mesh so that its vertices are exposed.
Select the first vertex and the first tracker—both can be selected at once. Use the corresponding Lasso operation for the vertices and tracker. It can be convenient to zoom the perspective window, or use two different perspective or 3D viewports to do
that. Select the Add link and align mesh menu item on the Linking submenu, and a new link will be created and the mesh moved to match them up.
Select the second vertex and second tracker, and do the Add link and align mesh item again, and both vertices will match, achieved by moving, rotating, and scaling the mesh.
Repeat for the third vertex and tracker. These do not have to be an exact match! This time, the mesh will rotate about the 3-D line between the first two trackers/vertices so that the third vertex and tracker fall on the same plane, just like for the coordinate system setup. The first two links are "lock points" whereas the third pair is like "on plane." So the third link is of a different type than the first two, the tracker is linked to a position relative to the three vertices.
If you change the solve, you should update the position of the primitive using the Linking/Align via Links dialog, described next.
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