How to add signs, sounds, etc. to your resource pack

This guide will tell you how to add signs, sounds, etc. to your resource pack.

MTR4 format is used in this tutorial.

Adding a sign

Go to your .minecraft folder.

Then find the resourcepacks folder

Create a folder with a name that you want (for example: My custom signs)
Create a new folder inside of the existing folder called assets.
Upload a pack.png to your folder, this image will show in the resourcepack selection screen and should be 128×128.
Download this template pack.mcmeta and put it into your resourcepack folder:

{
    "pack": {
        "description": "put your pack description here",
        "pack_format": 9
    }
}

The pack format is what version of Minecraft the pack is for. If you are only adding MTR models or textures, this is not important.
However, if you feel the need to add a number, it is recommended to use 8 or 9, as they correspond to versions 1.18 and 1.19 respectively.
If a pack tells you it's “not compatible”, just remember that the only thing that changes that is this number, so it really doesn't say much.

Create a new folder named mtr in the assets folder.

Create a text file inside the folder named mtr_custom_resources.json

JSON files

The mtr_custom_resources.json defines all custom resources that you want to add. The template is provided below.

mtr_custom_resources.json

{
    "vehicles": [],
    "signs": [],
    "rails": [],
    "objects": [],
    "lifts": []
}

Adding your icon to the pack

Create a folder under mtr with a name that you want (for example: custom_signs).

Note that you can only use a-z, 0-9, - and _ for the folder name. CAPITAL LETTERS, white spaces and any other characters are not acceptable.

Add in the custom icon that you wanted to use.

Typically, an icon for signs is 128 x 128 in size.

Registering the sign data

Compulsory components

Return to the mtr_custom_resources.json. Inside the square brackets of “signs”, add the following code.

mtr_custom_resources.json

{
	"id": "my_custom_sign",
	"textureResource": "mtr:custom_signs/custom_icon.png",
	"customText": "你好|Hello",
	"small": false,
	"flipCustomText": false
}

Replace the id to an ID that you like. Only a-z, 0-9, -, _ and ! are accepted.
Replace the textureResource with the path to the icon.

Optional components

Replace the customText with any text that you want to render. Use a vertical bar (|) to separate between two languages.
Set small to true if you want the icon to be rendered with a small padding around.
Set flipCustomText to true if you want the text to be rendered to the right.

Save the JSON file.

Please remember to validate your JSON file. Websites such as JSONLint may be used to validate your JSON. Minecraft will NOT load any custom resources in a mtr_custom_resources that is invalid!