Question

If I have a sphere that is being rotate by the users mouse, how could I (at any time, say via a button) apply some rotation transformation on the Camera so that a specific spot on the Sphere is facing the User?

Currently I m implementing a trackball approach that moves the camera around when the user clicks and drags, and I would like to be able to "Pan" to a specific spot on the Sphere, but I dont know how to calculate the required 3D rotation transformation based on the cameras current position.

Any help here would be greatly appreciated.

Thanks, Mark

Answer 1

I think you need something like this(it s rather simple you just have to know where do want your camera and where to look, the rest will be taken care of by WPF :-) ):

                 Vector3DAnimation lookAnimation = new Vector3DAnimation(
                    currentLookDirection, nextLookDirection,
                    TimeSpan.FromMilliseconds(1000));

                Point3DAnimation positionAnimation =
                   new Point3DAnimation(currentPosition, nextPosition,
                   TimeSpan.FromMilliseconds(1000));

                mainViewport.Camera.BeginAnimation(
                    PerspectiveCamera.LookDirectionProperty, lookAnimation);
                mainViewport.Camera.BeginAnimation(
                    PerspectiveCamera.PositionProperty, positionAnimation);

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