Moving Camera via script along Dolly Track

The AutoDolly feature just finds the closest point to the target on the path, and tries to put the camera there. The code is in CinemachineTrackedDolly.cs, and it looks like this:

Code (CSharp):

1.             // Get the new ideal path base position
2.             if (m_AutoDolly.m_Enabled && FollowTarget != null)
3.             {
4.                 float prevPos = m_Path.ToNativePathUnits(m_PreviousPathPosition, m_PositionUnits);
5.                 // This works in path units
6.                 m_PathPosition = m_Path.FindClosestPoint(
7.                     FollowTargetPosition,
8.                     Mathf.FloorToInt(prevPos),
9.                     (deltaTime < 0 || m_AutoDolly.m_SearchRadius <= 0)
10.                         ? -1 : m_AutoDolly.m_SearchRadius,
11.                     m_AutoDolly.m_SearchResolution);
12.                 m_PathPosition = m_Path.FromPathNativeUnits(m_PathPosition, m_PositionUnits);
13.  
14.                 // Apply the path position offset
15.                 m_PathPosition += m_AutoDolly.m_PositionOffset;
16.             }

You could write a custom script to follow a path (see CinemachineDollyCart.cs for an example). You can attach that script to an invisible object and have the vcam track that, or you could put DoNothing in the vcam's body and attach your script directly to the vcam to control its position based on your custom path-following algorithm.