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RhinoViewportChangeToTwoPointPerspectiveProjection Method (Double, Vector3d, Double)

Use this function to change 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.

Namespace:  Rhino.Display
Assembly:  RhinoCommon (in RhinoCommon.dll)
Since: 6.0
Syntax
Copy
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 preserved.
up
Type: Rhino.GeometryVector3d
This direction will be the locked up direction. Pass ON_3dVector::ZeroVector 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
If the current projection is perspective and bSymmetricFrustum, FrustumIsLeftRightSymmetric() and FrustumIsTopBottomSymmetric() are all equal, then no changes are made and true is returned.
See Also