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ViewportInfoChangeToTwoPointPerspectiveProjection Method
Changes projections of valid viewports to a two point perspective. It will make common additional adjustments to the frustum and camera location and direction so the resulting views are similar. If the current projection is perspective and IsFrustumIsLeftRightSymmetric is true and IsFrustumIsTopBottomSymmetric is false, then no changes are made and true is returned.

Namespace: Rhino.DocObjects
Assembly: RhinoCommon (in RhinoCommon.dll) Version: 5.1.50000.0 (5.0.20693.0)
Syntax
public bool ChangeToTwoPointPerspectiveProjection(
	double targetDistance,
	Vector3d up,
	double lensLength
)

Parameters

targetDistance
Type: SystemDouble
If RhinoMath.UnsetValue this parameter is ignored. Otherwise it must be > 0 and indicates which plane in the current view frustum should be perserved.
up
Type: Rhino.GeometryVector3d
The locked up direction. Pass Vector3d.Zero if you want to use the world axis direction that is closest to the current up direction. Pass CameraY() if you want to preserve the current up direction.
lensLength
Type: SystemDouble
(pass 50.0 when in doubt) 35 mm lens length to use when changing from parallel to perspective projections. If the current projection is perspective or lens_length is <= 0.0, then this parameter is ignored.

Return Value

Type: Boolean
true if the operation succeeded; otherwise, false.
See Also