Set the distances between the left and right planes, and the top and bottom planes of the view frustum at the focal distance along the view direction from the camera position. Need to call SetFocalDistance before calling this method.

Public Sub SetExtentsAtFocalDistance ( _
	horizontal As Double, _
	vertical As Double _
)

public void SetExtentsAtFocalDistance(
	double horizontal,
	double vertical
)

public:
void SetExtentsAtFocalDistance(
	double horizontal, 
	double vertical
)