You can rotate an object to a specific angle in 3ds Max by using the Angle Snap feature in conjunction with the Rotate tool. Here's how:
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Activate the Rotate Tool: Select the object you want to rotate and activate the Rotate tool (usually by pressing the "E" key).
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Enable Angle Snap: Right-click the Angle Snap Toggle button on the main toolbar (it looks like a magnet). If the toolbar button is already active (highlighted), right-clicking it will still open the settings dialog.
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Set the Angle Increment: This opens the Grid and Snap Settings dialog. Go to the Options tab. In the General group, find the Angle setting. Enter the exact degree of rotation you need in this field. For example, if you want to rotate precisely 45 degrees, enter "45".
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Rotate the Object: With Angle Snap enabled and the desired angle set, drag one of the rotation handles (X, Y, or Z axis) of the Rotate gizmo to rotate the object. The rotation will now snap to the angle increment you specified. Hold down the Shift Key while rotating for cloning.
In summary, define the desired angle in the Angle Snap settings, activate Angle Snap, and then use the Rotate tool to achieve precise rotations.