Reference Points is an array of point clusters that define the coordinate system.

If two points are specified, these points are assumed to lie along the x-axis of the coordinate system and the first point is used as the origin of the coordinate axis, as shown in the following figure.

If three points are specified, the first two points are assumed to be along the x-axis, and the third point is assumed to be on the y-axis of the coordinate system, as shown in the following figure.

Axis Reference specifies the direction of the coordinate system. The Axis Reference can be Direct or Indirect. Refer to Axis Type for more information.

error in (no error) describes the error status before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.

	status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
	code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
	source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.

Coordinate System specifies the coordinate system defined by Reference Points and the Axis Reference.

	Origin is a point cluster that specifies the origin of the base reference coordinate system.
	Angle (deg) is the angle the base reference coordinate system makes with the image coordinate system.
	Axis Reference is defined as Direct or Indirect. Refer to Axis Type for more information.

error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out indicator on the front panel and select Explain Error from the shortcut menu for more information about the error.

	status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
	code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
	source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.