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(svn r23425) -Document [FS#4815]: why vehicles might be continuously changing speed up and down

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rubidium 2011-12-04 12:07:19 +00:00
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known-bugs.txt
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@ -338,3 +338,23 @@ Train does not crash with itself [FS#4635]:
it does not add anything to gameplay.
Nevertheless trains shall not crash in normal operation, so making
a train not crash with itself is the best solution for everyone.
Vehicles not keeping their "maximum" speed [FS#4815]:
Vehicles that have not enough power to reach and maintain their
advertised maximum speed might be constantly jumping between two
speeds. This is due to the fact that speed and its calculations
are done with integral numbers instead of floating point numbers.
As a result of this a vehicle will never reach its equilibrium
between the drag/friction and propulsion. So in effect it will be
in a vicious circle of speeding up and slowing down due to being
just at the other side of the equilibrium.
Not speeding up when near the equilibrium will cause the vehicle
to never come in the neighbourhood of the equilibrium and not
slowing down when near the equilibrium will cause the vehicle
to never slow down towards the equilibrium once it has come down
a hill.
It is possible to calculate whether the equilibrium will be
passed, but then all acceleration calculations need to be done
twice.