Inverts the spatial motion vector, i.e.:
Given the spatial motion of frame A with respect to frame B, expressed in frame C, this method computes
the spatial motion of frame B with respect to frame A, expressed in frame C (or vice versa), by just taking the additive inverse.
isConvex
Returns true iff clockwiseOrderedListOfVertices forms a convex polygon,
based on the number of sign changes encountered when 'walking along' the polygon edges
This method should be used by the InterruptableWorker to check if it has been interrupted
It returns true when stop has been called and stays true until reset
Returns a boolean value, stating whether a 2D point is on the left side of a given line
"Left side" is determined based on order of lineStart and lineEnd
returns false if point is on line