Yes - probably the most flexible way is to use a null as a parent. I'm assuming here that the triangle shown in the top image is NOT already rotated... but has been created 'as shown'. 1. Create yourself a null object, make it 3D and position the top left corner of the null over the edge you want to rotate. 2. set the orientation of the null to: 0.0, 0.0, 45 (45 degrees on the Z axis). 3. parent the shape to the null. 4. animate the X rotation value of the null
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