Trains chosing an alternative path when encountering a 1-way presignal instead of waiting about openttd HOT 8 CLOSED

StarLite wrote:

This bug was encountered with NTP, no NPF.
Game settings below

Attachments

• bug6.png (17.70 KiB)

This comment was imported from FlySpray: https://bugs.openttd.org/task/50#comment103

from openttd.

StarLite wrote:

Same bug, but with a normal signal instead of a pre-signal.

Attachments

• bug7.png (204.87 KiB)

This comment was imported from FlySpray: https://bugs.openttd.org/task/50#comment104

from openttd.

Celestar wrote:

could you just provide a savegame?

This comment was imported from FlySpray: https://bugs.openttd.org/task/50#comment226

from openttd.

StarLite wrote:

Here it is

This comment was imported from FlySpray: https://bugs.openttd.org/task/50#comment231

from openttd.

KUDr wrote:

I guess we should rather call it feature than bug. Can't expect that all PFs will behave the same:

1. NTP loops regardless of the signal type (one/two-way)
2. NPF always goes straight (and train stops)
3. YAPF chooses the straight when signal is one-way and loops on two-way signal

Can we tell which one works correctly?
And can we tell that the other two pathfinders are broken?

I guess the correct answers are "No" and "No".

Opinions?

This comment was imported from FlySpray: https://bugs.openttd.org/task/50#comment256

from openttd.

Tekky wrote:

I disagree with the last post. Pathfinders in general should only select routes which take the vehicle to its target. They should never loop.

YAPF's behavior may be acceptable if you assume that two-way signals are supposed to explicitly instruct the train to "choose" a green signal. However, I believe that one-way and two-way signals should both be treated the same by the pathfinder, as is the case with NPF.

This comment was imported from FlySpray: https://bugs.openttd.org/task/50#comment292

from openttd.

KUDr wrote:

Pathfinder should select the best route. The only thing we can discuss about is if it is better to stop the train or let it wait while it moves (loop). It depends on the situation and on your opinion. The statement "They should never loop." is totally invalid.

Only the valid statement would be "I would like to stop the train rather than to let it loop." or "It is better to don't stop the train and continue moving until the path is free.".

This comment was imported from FlySpray: https://bugs.openttd.org/task/50#comment293

from openttd.

Darkvater closed the ticket.

Reason for closing: Not a bug

Not a bug, (mis/dis)interpretation of pathfinder logics

This comment was imported from FlySpray: https://bugs.openttd.org/task/50

from openttd.