The VX function returns the x-direction velocity for one marker or the relative velocity of two markers in the x-direction.
Format
Arguments definition
|
Marker1 |
The name or argument number of a marker to be calculated |
|
Marker2 |
The name or argument number of the marker to use in the relative calculation •If omitted, then the InertiaMarker is applied. |
|
Marker3 |
The name or argument number of the marker for axis definition •If omitted, then the InertiaMarker is applied. |
|
Marker4 |
A standard marker for calculating velocity •The formula measures the velocity relative to Marker4’s angular velocity. •Marker4 must be the same value as Marker3. If omitted, then the InertiaMarker is applied. |
Formulation
: Velocity
vector of Marker1 relative to Marker4’s angular velocity
: Velocity
vector of Marker2 relative to Marker4’s angular velocity
:
x-direction unit vector of Marker3
Example
VX (body1.marker1)
VX (body1.marker1, body2.marker2)
VX (body1.marker1, body2.marker2, body3.marker3)
VX (body1.marker1, body2.marker2, body3.marker3, body3.marker3)
VX (1,2,3,3) <Argument: (1)body1.marker1, (2)body2.marker2, (3)body3.marker3>