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Gets or sets the rotation of the extruded shape around the y-axis in degrees.
Use this property to get or set the y-axis rotation applied to a shape's 3-D formatting.
double RotationY { get; set; }
Property RotationY As Double
IShape shape = worksheet.Shapes.AddShape(AutoShapeType.Rectangle, 1, 1, 100, 100);
shape.ThreeD.Depth = 7;
shape.ThreeD.RotationY = 20;
double rotationY = shape.ThreeD.RotationY;