time is the scheduler's liveReadonlyTimeState; copy it with
copyTimeState to retain a step's values. simulationStep and
simulationTime already describe the step being produced.
interpolationAlpha still holds the previous frame's value during a fixed
step and must not be read here (§42).
What a system is given on every fixed step.
timeis the scheduler's live ReadonlyTimeState; copy it withcopyTimeStateto retain a step's values.simulationStepandsimulationTimealready describe the step being produced.interpolationAlphastill holds the previous frame's value during a fixed step and must not be read here (§42).