michi_cc wrote:

The point of the flags in var 4A is to give some information even if the actual rail type has no entry in the translation table.

This allows for example to lift a pantograph on electric railways. It shouldn't depend on powered-wagon state or anything else to not limit these things just to powered wagons.

This comment was imported from FlySpray: https://bugs.openttd.org/task/3957#comment8350

planetmaker wrote:

I don't understand.

I don't dispute the check for the railtype at all, that's a great addition!

This is only about the duplication of the 'has_power' bit - which both bits, this one in var 4A and the one in var FE use to describe their use. To me that implies that it is
a) either an engine or powered wagon
and
b) is on a railtype which provides power to that type.

Correct me if I'm wrong, I seem to lack some insight here: the difference is, that using var 4A a vehicle which intrinsically cannot have power can also yield the result 'has_power' under the condition that it is its primary or a compatible railtype which it is designed for. As such the 'has_power' check of this wagon will be wrong, if the actually powered vehicles define different railtype preferences. Where or how do I need this check or what would be the appropriate name, if seemingly not 'has_power'? Or alternatively: where does the FE variable 'has_power' check return true when it should not?

This comment was imported from FlySpray: https://bugs.openttd.org/task/3957#comment8352

frosch wrote:

Var FE does not work for articulated vehicles, as they are not engines. (Accessing the front vehicle does not help for multiple engines.)
For var 4A the Grf needs to know itself, whether the vehicle is a engine or powered wagon.

So:

1. You want to modify running costs if a vehicle is powered -> Articulated parts do not need to control this. -> Use var FE.
2. You want to show sprites depending of poweredness -> You need it for all vehicles, not only the front parts. -> Use var 4A.

This comment was imported from FlySpray: https://bugs.openttd.org/task/3957#comment8353

planetmaker wrote:

following up IRC discussions and clearifications here, this task can be closed.

This comment was imported from FlySpray: https://bugs.openttd.org/task/3957#comment8384

frosch closed the ticket.

Reason for closing: Requested by user

two variables for two things

This comment was imported from FlySpray: https://bugs.openttd.org/task/3957