Convention guideline for unity3d project

Script (C#)

Naming

identifier	rule
Namespace	PascalCase
Class	PascalCase
Interface	IPascalCase
Type Variable	TPascalCase
Enum	PascalCase
Struct	PascalCase
Public Const	PascalCase
Private Const	PascalCase
Public Static Property	PascalCase
Private Static Property	PascalCase
Public Static Field	PascalCase
Private Static Field	s_camelCase
Public Property	PascalCase
Private Property	PascalCase
Public Field	PascalCase
Private Field	_camelCase
Method	PascalCase
Event	PascalCase
Parameter	camelCase
Local Const	PascalCase
Local Variable	camelCase
Local Method	PascalCase

Line Break & Wrapping

Every Line Break is Allman Style

namespace FooNamespace
{
    class BarClass<T> : ExtensionClass where T : new()
    {
        public int SomeSimpleProperty { get; set; }

        public int SomeOtherSimpleProperty => _valueField;

        public int SomeComplexProperty
        {
            get
            {
                // Some body...
            }
        }

        private void SomeMethod()
        {
            if (someCondition)
            {
                _someValue =
                    anyCondition
                        ? option1
                        : option2;
                
                _someCalculation =
                    operand1
                    + operand2
                    + operand3;
            }
        }
    }
}

use of #region keyword

If there is too many methods in component so distinguishing Unity Event methods from other methods, consider using #region Unity Events #endregion Unity Events to mark them.

Under Assets/ directory

Often, third party packages or plugins place their required assets under very top level of Assets/ directory. (e.g. Assets/TextMeshPro/)
So to place Project's own files under Assets/<project name>/ directory is recommended. (e.g. Assets/MySampleProject/Scripts/)

Assets/
├ MyProject/
│ ├ Scripts/
│ ├ Textures/
│ ├ Atlases/
│ ├ Sounds/
│ ...
│
├ SomeCommonToolkit/
├ AddressableAssetSettings/
├ TextMeshPro/
├ Plugins/
└ other-sdk-generated-things-gibberish/ 

General Rule for Directory and Assets

Both PascalCase, without space. Underbar is ok if needed. (e.g. UI_DefaultButton.asset)

Note for "given" assets

In most of the cases, assets that are made outside of unity has their own naming scheme depending of their authors.

If project is already on track and normalizing requires significant changes, follow existing rule for that particular type of assets.

Image files

Original files must be in png format, or equivalent lossless format. If another compression format is needed due to file size, use atlas settings or image import settings instead.

Sound files

Original files must be in .wav format, or equivalent lossless format. But if original sound is too long, (typically bgms over 1 minute) ask sound person for compressed file with acceptable sound quality.
Actual encoding format can vary depending on target platform. Discuss with team for this.

Components, Settings

TextMeshPro

Turn off 'Raycast Target' from TMP default. In the most of the cases, text mesh just doesn't need to be clicked by itself.