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ViewportInfoChangeToPerspectiveProjection Method

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 changed. If the current projection is perspective and symmetricFrustum, IsFrustumIsLeftRightSymmetric, and IsFrustumIsTopBottomSymmetric are all equal, then no changes are made and true is returned.

Namespace:  Rhino.DocObjects
Assembly:  RhinoCommon (in RhinoCommon.dll)
Since: 5.0
public bool ChangeToPerspectiveProjection(
	double targetDistance,
	bool symmetricFrustum,
	double lensLength


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.
Type: SystemBoolean
true if you want the resulting frustum to be symmetric.
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