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ReferenceDirection
3D

ReferenceDirection[axis] returns the reference direction associated with axis. This is a vector that is not parallel to the direction of axis.

• The reference direction of an axis may be explicitly specified with Axis[origin, direction, refdir].
• If direction is specified with Plane[p1, p2, p3] and refdir is unspecified then the reference direction of the axis is Line[p1, p2].
• Reference directions are used by some constraints to control the spin of a body about axis.
• Unspecified reference directions are chosen automatically. For example, ReferenceDirection[Axis[{0, 0, 0}, {1, 0, 0}]] returns {0, 1, 0}
• See also:
Axis, Line, Plane.

Further Examples

Load the Modeler3D package.

The reference direction of an axis can be specified explicitly.

The reference direction of a plane is the vector from the plane's first to second points.

Unspecified reference directions are chosen automatically.

The setting of $MechUseMinimalRotation affects the choice of unspecified reference directions.


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