What Is Linden Scripting Language Based On?


Larry Thompson

Linden Scripting Language (LSL) is a scripting language used in Second Life, a virtual world created by Linden Lab. LSL is based on the programming language C, specifically the C subset of ISO standard C90. It was chosen as the foundation for LSL due to its well-established syntax and widespread use in the programming community.

What makes LSL unique?
LSL is designed specifically for creating interactive objects and behaviors within Second Life. It allows users to script objects, create animations, and control various aspects of the virtual environment. With LSL, users can build everything from simple furniture with interactive buttons to complex games and simulations.

How does LSL relate to C?
If you’re already familiar with C or have programming experience in any C-like language such as Java or JavaScript, learning LSL will be relatively straightforward. The syntax of LSL shares many similarities with these languages, making it easier for developers to transition their skills to scripting in Second Life.

Linden Scripting Language Syntax

Like its predecessor C, LSL uses semicolons (;) to separate statements and curly braces ({}) to define code blocks. Here’s an example of a basic LSL script:

        llSay(0, "Hello, World!");

In this script:

  • default: This is an event handler function that gets called automatically when the script starts.
  • state_entry(): This function is called when entering a specific state within the script.
  • llSay(0, “Hello, World!”); This line uses the llSay() function to display the message “Hello, World!” in local chat.

LSL Functions and Events

LSL provides a wide range of built-in functions and events that allow you to interact with the virtual world. These functions can control avatar movement, object creation, chat communication, and much more. Some commonly used LSL functions include:

  • llMoveToTarget(): Moves an object towards a specified Target location.
  • llInstantMessage(): Sends an instant message to another avatar.
  • llSetTexture(): Changes the texture of an object.

LSL also has various events that trigger specific actions or behaviors within the script. These events include:

  • state_entry(): Triggered when entering a specific state.
  • touch_start(): Activated when an avatar clicks or touches an object.
  • collision_start(): Fired when two objects collide with each other.

The Power of LSL

With its C-based syntax and extensive library of functions and events, LSL provides users with vast possibilities for creating interactive experiences in Second Life. Whether you’re building a virtual shopping mall, organizing live performances, or designing complex simulations, LSL is a powerful tool that empowers creators to bring their ideas to life.

In conclusion, Linden Scripting Language (LSL) is based on the programming language C. Its syntax shares similarities with C and other C-like languages, making it accessible to developers familiar with these languages. LSL offers numerous built-in functions and events that allow users to script objects and create interactive experiences within Second Life. So whether you’re a seasoned programmer or just starting your scripting journey, LSL provides a solid foundation for unleashing your creativity in the virtual world.

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