ArcObjects Library Reference (3DAnalyst)  

esri3DProjectionType Constants

The Esri 3D projection modes.

Constant Value Description
esriPerspectiveProjection 1 Perspective projection.
esriOrthoProjection 2 Orthographic projection.

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server. Requires 3D Analyst Extension.