Difference between revisions of "Calibration Squares"

Revision as of 21:08, 13 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. Each calibration square has different vertical offset value. When defining the ground plane, Motive will recognize the square and ask user whether to change the value to the matching offset.

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: