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Is there a way to detect the distance between a person, and an object?
For example, a train is coming to the station but it calculates the distance into time, so the players know when it will arrive.
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Try this Wiki page on Magnitude. http://wiki.roblox.com/index.php?title=Magnitude
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Jane drives at an average speed of 45 mph on a journey of 135 miles. To find a time, we need to divide distance by speed.
TL;DR - time = distance/speed
Distance is the magnitude between the two vector positions
local mag = (pos1 - pos2).magnitude
Speed is how fast the object is traveling
local speed = 50 --Not 100% on how to calculate this from velocity. so just use a set variable :P
So to find the time
local speed = 50 --studs a second
local distance = (pos1 - pos2).magnitude
local time = distance/speed
print('object arrives in '..time..' seconds')