View > Display > Perspective
Specifies whether the model is rendered using the Perspective mode.
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When unchecked, the option is set to orthographic mode. If you were in perspective mode and the Allow fly-to behaviors option is set, Smart Review performs a fly-to transition to orthographic mode. The view cones in the Plan and Elevation views update during the transition.
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When you select Perspective and the Allow fly-to behaviors option is set, Smart Review performs a fly-to transition to perspective mode. The perspective angle that was set before your previous change to orthographic mode will be used. The view cones in the Plan and Elevation views update during the transition.