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|src||The source point of the drag.|
|dest||The destination point of the drag.|
|srcPosition||The 3D position the dragged object had at
|constraintDir||3D direction of constrained movement.|
float The distance travelled along constraintDir.
Map a mouse drag onto a movement along a line in 3D space.
Certain types of Handles (such as arrows) involve movement along a line in 3D space. For example, the Transform's position arrows move the object along its local X, Y or Z axis as the mouse is dragged. The CalcLineTranslation function converts the movement of the mouse into constrained movement along a 3D line in the familiar way used by Unity's built-in tools.