Specifies the type of 3D projection.
public enum Pdf3dProjectionType
Orthographic = 1
The orthographic projection, which projects objects onto the near plane by simply discarding their Z value.
Perspective = 0
The perspective projection, which projects a given coordinate (x, y, z) onto the near plane, defining a 2D coordinate (x1, y1) using the following formulas:
x1 = x * n / z
y1 = y * n / z
nis the Z coordinate of the near plane.