IChart3DOptions.Perspective Property
Specifies the field of view angle for the 3-D chart in degrees. Must be between 0 and 100. IMPORTANT: In Excel 2007 or newer, this value is displayed on screen in 1/2 degrees instead of degrees, so it will show as the double of the value you see here. In Excel 2003 or older it is displayed in degrees instead.
Syntax
Unit: FlexCel.Core
property IChart3DOptions.Perspective: Double