Identifying Items with a 2D Pick

Model Reference Manual

Interacting with a Graphical View : Identifying Displayed Items and Points : Identifying Items with a 2D Pick

Identifying Items with a 2D Pick

Use a working plane in preference to this older functionality.

TWODPLANE TWODPICK

This facility lets the user define a plane which is normal to the view direction. The user can then use the cursor to pick a point in an orthogonal view such that the third coordinate of the required point is derived automatically from this plane.

The TWODPLANE command defines the 2D picking plane in terms of a point within the plane.

The AT TWODPICK @ command may then be used to request a cursor position which identifies a point within the 2D picking plane. The plane is generated dynamically from the TWODPLANE point and the view direction.


Examples:
TWODPLANE E1000 N2000 U500	Defines 2D picking plane which passes through given point and which is normal to view direction
AT TWODPICK	Using the preceding 2D picking plane definition, a cursor hit at E1234 N5678 in a plan view will return the position E1234 N5678 U500 in World coordinates

Note:

Cursor positions are always returned in World coordinates. In order to obtain the correct result, the 2D picking plane must therefore be set to an absolute World position.

Command Syntax:

>-- TWODPLane -- <bpos> -->

>-- AT TWODPick @ -->

>-- Q -- TWODPLane -->

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