You can turn a 3D layer by changing the layer’s Orientation values or by changing its Rotation values. In both cases, the layer turns around its anchor point. The Orientation and Rotation properties differ in how the layer moves when you animate them.
When you animate a 3D layer’s Orientation property, the layer turns as directly as possible to reach the specified orientation. When you animate any of a 3D layer’s X, Y, or Z Rotation properties, the layer rotates along each individual axis according to the individual property values. In other words, Orientation values specify an angular destination, whereas Rotation values specify an angular route. Animate Rotation properties to make a layer turn multiple times.
Animating the Orientation property is often better for natural, smooth motion, whereas animating the Rotation properties provides more precise control.
Donat Van Bellinghen provides a some expressions for placing and orienting a 3D layer in the plane defined by three points: www.adobe.com/go/learn_ae_donat3dlayer3points.
Rotate or orient a 3D layer in the Composition panel
Rotate or orient a 3D layer in the Timeline panel
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