action = [translation, pick/unpick] * num_pickers. 1. Determine whether to pick/unpick the particle and which one, for each picker 2.

Get the associated resource

get the postion, velocity of flex particles, and postions of flex shapes.

if there's a pending marker from the entropy stream, return that otherwise, fetch from the stream and get a marker. if there's no marker, return 0xff,

returns 1 if the product is valid, 0 on overflow. negative factors are considered invalid.

initialize a callback-based context

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