1  | directions3DDataFrame(coords, df, directions)
 | 
coordsA list containing the coordinates for each data unit.
dataA data.frame with each data unit's attributes.
bboxA matrix containing the coordinates of two opposing
edges of the object's bounding box.
directionsA matrix containing coordinates of unit vectors
representing directions.
directions3DDataFrame-init,
spatial3DDataFrame-class,
points3DDataFrame-init
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