Difference between revisions of "Calibration Squares"

Revision as of 01:26, 7 November 2015

During Calibration process, a calibration square is used to define global coordinate axes as well as the ground plane for the capture volume.

Custom Calibration Square

Calibration Squares

Square Type	Descriptions
	CS-100: Used to define a ground plane in a small, precise motion capture volumes. Long arm: Positive z Short arm: Positive x Vertical offset: 11.5 mm
	CS-200: Long arm: Positive z Short arm: Positive x Vertical offset: 19 mm
	CS-400: Used for general for common mocap applications. Contains knobs for adjusting the balance as well as slots for aligning with a force plate. Long arm: Positive z Short arm: Positive x Vertical offset: 45 mm
	Legacy L-frame square: Legacy calibration square designed before changing to the Right-hand coordinate system. Long arm: Positive z Short arm: Negative x

Coordinate System

For Motive 1.7 or higher, Right-Handed Coordinate System is used as the standard, across internal and exported formats and data streams. As a result, Motive 1.7 now interprets the L-Frame differently than previous releases:

Motive 1.6 and earlier L-Frame long (marked Z) "leg" interpreted as -Z, L-Frame short (unlabeled) leg interpreted as +X	Motive 1.7+ L-Frame long (marked Z) "leg" interpreted as +Z, L-Frame short (unlabeled) leg interpreted as -X
Motive 1.6 L-Frame	Motive 1.7 L-Frame

The simplest method to account for this change is to rotate the L-Frame 180° during calibration (rotating "around the Y axis"). If the L-Frame is not rotated during calibration, Motive will display inverted global coordinates when comparing the same data in Motive 1.7 and Motive 1.6 and earlier: