TsukimiSharp Reference

TsukimiSharp is a subset of C# that compiles to Udon, which runs inside VRChat worlds.

Getting started

Page	Contents
Setup	Installing from VCC or ALCOM, your first script, and the samples

Runtime foundations

Page	Contents
Udon’s execution model	How it runs on Udon, and why the constraints exist
Program shape	File layout, namespaces, visibility, name resolution
Events	List of events the runtime calls
Initialization and execution order	Initializers, declaration order, up to the first event

What you can write

Page	Contents
Lexical structure and literals	All forms of numeric and string literals
Types	Types you can use (section below)
Conversions	Which conversions are allowed, type tests, boxing
Variables and how arguments are passed	Kinds of variables, ref / out / in, definite assignment
Members	All forms of members you can declare
Control flow	Branching, loops, statement structure
Expressions	Operators, strings, null handling, primary expressions
Patterns	All pattern forms and exhaustiveness
Numerics	Values on overflow, conversions that halt
null and references	Sources of null and how to handle it safely
Attributes	List of attributes that have meaning to the runtime
Extension methods	How to write static helpers
Preprocessor	Directives you can use

Working with the environment

Page	Contents
Working with other components	Getting, calling, referencing
Sync	Synced variables, ownership, events
Kernels	Running computation on the GPU, forms you can write inside a kernel
Running kernels	Buffers, execution, retrieving results

Look things up

Page	Contents
Errors	Look up by error number
List of boundaries	Mechanisms that don’t exist, and how they get rejected