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| author | rubidium <rubidium@openttd.org> | 2011-12-04 12:07:19 +0000 |
|---|---|---|
| committer | rubidium <rubidium@openttd.org> | 2011-12-04 12:07:19 +0000 |
| commit | b2dc4d9c1dcd7c49191005e0a533ca926126eb87 (patch) | |
| tree | a9871b95caa1f22c937333ac6ad437aa6205c25b | |
| parent | 1f9f73d2b69c484e86b236f38edffcf55f074ade (diff) | |
| download | openttd-b2dc4d9c1dcd7c49191005e0a533ca926126eb87.tar.xz | |
(svn r23425) -Document [FS#4815]: why vehicles might be continuously changing speed up and down
| -rw-r--r-- | known-bugs.txt | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/known-bugs.txt b/known-bugs.txt index c1a87d7be..04bef6a90 100644 --- a/known-bugs.txt +++ b/known-bugs.txt @@ -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. |