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CENTER(nged)		     BRL-CAD User Commands		  CENTER(nged)

NAME
       center -	Positions the center of	the mged viewing cube at the specified
       model coordinates.

SYNOPSIS
       center [x y z]

DESCRIPTION
       Positions the center of the mged	viewing	cube at	the specified model
       coordinates. This is accomplished by moving the eye position while not
       changing	the viewing direction. (The lookat command performs a related
       function	by changing the	viewing	direction, but not moving the eye
       location.) The coordinates are expected in the current editing units.
       In case the coordinates are the result of evaluating a formula, they
       are echoed back.	If no coordinates are provided,	the current center
       coordinates (in current editing units, not mm) are printed and can be
       used in subsequent calculations.

       It is often convenient to use the center	of the view when visually
       selecting key locations in the model for	construction or	animation
       because of (1) the visible centering dot	on the screen, (2) the fact
       that zoom and rotation are performed with respect to the	view center,
       (3) the default center-mouse behavior is	to move	the indicated point to
       the view	center,	and (4)	the angle/distance cursors are centered	by
       default.	This command provides the means	to set and retrieve those
       values numerically.

EXAMPLES
       The examples show the use of the	center command to print	coordinates of
       the center of the mged display, move the	center of the mged display to
       a given point, set a Tcl	variable to the	display	center coordinates,
       move the	center point a given distance in a given direction, and	update
       a vertex	in the database	to be located at the current center of view.

       Example 1. Printing the coordinates of the center of the	mged display.

       mged> center

       Prints out the coordinates of the center	of the mged display.

       Example 2. Moving the center of the mged	display	to a specified point.

       mged>center 12.5	5.6 8.7>

       The center of the mged display is moved to the point (12.5, 5.6,	8.7).

       Example 3. Set Tcl variable $oldcent to the display center coordinates.

       mged>set	oldcent	[center]

       Sets the	Tcl variable $oldcent to the display center coordinates.

       Example 4. Move the center point	a given	distance in a given direction.

       mged> set glob_compat_mode 0

       mged units mm

       mged eval center	[vadd2[center] {2 0 0}]
	   Moves the center point 2 mm in the model + x	direction.

       Example 5. Update the vertex of a shape in the database to be located
       at the current view center.

       mged> units mm

       mged db adjust sphere.s V [center]

AUTHOR
       BRL-CAD Team

BUG REPORTS
       Reports of bugs or problems should be submitted via electronic mail to
       devs@brlcad.org

BRL-CAD				  08/29/2020			  CENTER(nged)

NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | AUTHOR | BUG REPORTS

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