Holds all viable gradient provider types.
uses PEDESTRIAN_CONTINUOUS, but enables the user to define two teleporter lines where the pedestrians are set back to the respective other line.
using continuous solution with Euklidean distance to targets
using discrete solution of the Eikonal equation, like with Fast Marching
using continuous solution with Euklidean distance to targets, mollified so that the gradient is continuous
obstacle "forces", continuous
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