How to make a NewGRF properly ?

[Alberth]

Please post your nml code, s people can point out your errors instead of having to dig in nmlc compiler sources

[acs121]

Hey,

How do i make cars change liveries if they are attached to a certains locomotive in NML ?
To explain, i want to do the same thing as the Generic MU cars go in 2cc TrainsInNML.

[Gwyd]

Livery override. It works in a similar way to the graphics block, but you need to define the carriage that is accepted and changed when coupled (by number or vehicle ID)

[acs121]

Livery override. It works in a similar way to the graphics block, but you need to define the carriage that is accepted and changed when coupled (by number or vehicle ID)

How do i insert it as NML code ?

[acs121]

Livery override is solved, now i just need to know about this error :

Code: Select all

[Knmlc ERROR: nmlc: An internal error has occurred:
nmlc-version: v6379:afad0c76c40b from 2017-06-19
Error:    (ValueError) "Unknown format code 'r' for object of type 'str'".
Command:  ['nmlc', '-c', '--grf', 'randstadrail.grf', 'randstadrail.nml']
Location: File "nml\grfstrings.py", line 971, in handle_grflangid

I attached everything if anyone wants to point out my errors.

[acs121]

Livery override is solved, now i just need to know about this error :

Code: Select all

[Knmlc ERROR: nmlc: An internal error has occurred:
nmlc-version: v6379:afad0c76c40b from 2017-06-19
Error:    (ValueError) "Unknown format code 'r' for object of type 'str'".
Command:  ['nmlc', '-c', '--grf', 'randstadrail.grf', 'randstadrail.nml']
Location: File "nml\grfstrings.py", line 971, in handle_grflangid

I attached everything if anyone wants to point out my errors.

So no one wants to look into my code ?

[Alberth]

I fixed nmlc, and now it says

Code: Select all

nmlc ERROR: "lang/english.lng", line 1: Invalid grflangid '0x01 :'

Not sure why you add a colon to a number

[acs121]

I fixed nmlc, and now it says

Code: Select all

nmlc ERROR: "lang/english.lng", line 1: Invalid grflangid '0x01 :'

Not sure why you add a colon to a number

Okay, thanks. Now it works with this part. Now it's telling me :

Code: Select all

[Knmlc ERROR: "randstadrail.nml", line 84: Syntax error, unexpected token ":"

[Alberth]

It means "I found a ':' and I have run out of ideas what you're trying to tell me."

In other words, the computer needs better directions from you. Computers are very fast but also very stupid. You cannot make typos, or add or omit random symbols, they immediately get stuck.

The ':' is the point where it gave up all hope of understanding you, often the real cause is a bit before that point.

Carefully check the line, and the line above! Verify that what you are trying to do is allowed at this point. Verify that you closed enough parentheses and square or curly brackets on the construct above.

Oh, and by "carefully", I mean very very very very carefully, not just glance over it, scrutinize each letter, digit, and symbol. Computers are fast but very stupid!

[acs121]

It means "I found a ':' and I have run out of ideas what you're trying to tell me."

In other words, the computer needs better directions from you. Computers are very fast but also very stupid. You cannot make typos, or add or omit random symbols, they immediately get stuck.

The ':' is the point where it gave up all hope of understanding you, often the real cause is a bit before that point.

Carefully check the line, and the line above! Verify that what you are trying to do is allowed at this point. Verify that you closed enough parentheses and square or curly brackets on the construct above.

Oh, and by "carefully", I mean very very very very carefully, not just glance over it, scrutinize each letter, digit, and symbol. Computers are fast but very stupid!

Okay i found the error and now it finally is working. Now it's telling me the sprites i've attached below don't have a palette :

[Andrew350]

See this page: https://www.tt-wiki.net/wiki/NMLTutorial/Graphic_files

It is the second page of the NML Tutorial, which I would highly suggest you read (and practice!) from start to finish to give you a solid understanding of some of the basics of NewGRF making. Mind you, it isn't something to be completed in 5 minutes; I spent close to a week going through it and it was still just enough to get going, but it's a good foundation to start from, and provides some good links to other resources as well

[acs121]

See this page: https://www.tt-wiki.net/wiki/NMLTutorial/Graphic_files

It is the second page of the NML Tutorial, which I would highly suggest you read (and practice!) from start to finish to give you a solid understanding of some of the basics of NewGRF making. Mind you, it isn't something to be completed in 5 minutes; I spent close to a week going through it and it was still just enough to get going, but it's a good foundation to start from, and provides some good links to other resources as well

Okay so...where must i put this palette file ? It's in th "gfx" folder, i tried with the four palettes and it didn't work.

[Quast65]

The palette has to be incorporated in your graphics file.
The easiest way to get a paletted graphicsfile is to decompile a GRF and just resize the graphicsfile that was in there to suit your graphics and then copy your graphics into that (and ofcourse then save it with the name you want to give it).

[Pyoro]

The palette has to be incorporated in your graphics file.
The easiest way to get a paletted graphicsfile is to decompile a GRF and just resize the graphicsfile that was in there to suit your graphics and then copy your graphics into that (and ofcourse then save it with the name you want to give it).

That strikes me as an odd solution. And if you do it (if I understand what you describe right) using something like paint.net, the files will actually lose their palette the moment you save anything (same for everything else that doesn't support palettes).


That aside ... it's not like the tutorial which acs linked doesn't explain how to do it
https://www.tt-wiki.net/wiki/Save_paletted_image_files
(GIMP is free and useful to have in any case; but there's obviously plenty alternatives)

[Quast65]

And if you do it (if I understand what you describe right) using something like paint.net, the files will actually lose their palette the moment you save anything (same for everything else that doesn't support palettes).

Ahh, good point. I use Photoshop, so never had any problems with that But good to know.

[acs121]

The palette has to be incorporated in your graphics file.
The easiest way to get a paletted graphicsfile is to decompile a GRF and just resize the graphicsfile that was in there to suit your graphics and then copy your graphics into that (and ofcourse then save it with the name you want to give it).

That's with Photoshop, i'm talking about GIMP since i use GIMP.
Oh well, i solved my issue now. Thanks Pyoro too.