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RhinoViewportChangeToPerspectiveProjection Method (Double, Boolean, Double)
Use this function to change projections of valid viewports from parallel to perspective. It will make common additional adjustments to the frustum and camera location so the resulting views are similar. The camera direction and target point are not be changed.

Namespace: Rhino.Display
Assembly: RhinoCommon (in RhinoCommon.dll) Version: Rhino 6.0
Syntax
public bool ChangeToPerspectiveProjection(
	double targetDistance,
	bool symmetricFrustum,
	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.
symmetricFrustum
Type: SystemBoolean
true if you want the resulting frustum to be symmetric.
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