Glosario
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For non-technical, everyday Second Life lingo, please see the Second Life Wiki:
Second Life Wiki Glossary
Agent
The data representation of the current user. In general, the code uses “agent” to mean you and “avatar” to mean someone else. Identified by a UUID, usually called “agent_id” in the code.
Aditi
The Beta Test grid used to test SL software with Non-Linden users before rolling it out on the main grid.
Agni
The primary SL grid to which users connect.
Asset
A data resource such as an image, sound, script, object, etc. Assets can be downloaded to the viewer or uploaded into a central asset store. Assets are identified by UUID and type. Types are in llassettype.h.
Avatar
The graphical representation of a user. Implemented in the class LLVOAvatar on the viewer.
Child
(Need a clear definition of "child"; this should include both "child agents" as referenced in How to Read 1.7 simulator Stats for instance, and other apparently subtly different definitions, as in "Your attachment is a child of your avatar which is in turn a child of the thing you are sitting on," in sitting) Child refers to an object or agent connected to or associated with another asset. While it is often technically part of the asset, it is not in itself the asset. Prims sub-linked to other prims are an example of a child. An avatar standing in a sim next to the one you are in would be a "child agent" of the sim you are standing in. Similarly, an asset attached to your avatar would also be a child.
Client
synonym for Viewer.
Estate
A collection of regions with a particular set of rules, such as banned users, sun position, etc. Each estate has an owner, either a user or “Governor Linden”. Most privately owned regions are in their own estates. Estates have integer identifiers. The “mainland” is estate id 1.
Farm
synonym for Grid.
Floater
A dialog or window appearing in the user interface. Implemented in classes titled “LLFloater*”
FMOD
Cross-platform audio library. Used to play decompressed sound effects and stream MP3 music to users on particular parcels. See FMOD.org.
Grid
A collection of sims. Linden Lab runs several grids for internal and external testing.
Host
Any server computer, but usually a sim.
Indra
The internal code name for the software project comprising the Second Life Servers (Userserver, Spaceserver, Dataserver, Simulator, and Backbone) and Viewer (the client)
JPEG2000
Wavelet based image compression format. Inherently progressive, so images can be displayed with only partial data available, without increases in file size. See the Wikipedia entry on JPEG2000.
Kakadu
Cross-platform high-performance JPEG2000 library. Linden Lab does not have redistribution rights to Kakadu so the open source viewer ships with OpenJPEG.
LSL
Linden Scripting Language, a C-like language used for server-side scripting of objects.
Message Template
The protocol description for UDP packet communication between the viewer and servers. Described in the text file app_settings/message_template.msg.
Ogg Vorbis
Open source audio compression library. Sound effects are stored as .ogg files in the asset system. See Ogg Vorbis.
Parcel
An area of land owned by a single user or group. Parcels are composed of square blocks measuring 4x4 meters, but the blocks do not have to be contiguous. Parcels have both an integer local id and a global UUID.
Prim
Abbreviation for primitive.
Primitive
3D object in the world. Each prim is represented by a set of parameters, including position, scale, rotation, shape, cut, hollow, etc. Prims can be linked together into link sets. They can also be attached to avatars, but this process is separate from linking. Primitives are implemented in LLPrimitive, with vertex generation performed in LLVolume and rendering in LLVOVolume.
Quaternion
Representation of a rotation. SL uses unit quaternions represented in four floats. This allows only three floats to be transmitted and the remaining value reconstructed on the viewer. See GameDev article on quaternions.
Region
Data set for a region of the world, like “Orientation Island” or “Ahern”. A region can be run by any simulator process, and regions move from sim to sim as the hosts are shut down, crash, etc.
Sim
Server host machine, for example sim1234.agni.lindenlab.com. The SL server grid consists of 2000+ sims. Sometimes “sim” is used incorrectly to mean simulator process or region.
Simulator
The primary SL server process. Each simulator process simulates one 256x256 meter region. As the viewer moves through the world it is handled off from one simulator to another. Multiple simulator processes run on each server host, currently 2 to 16.
SL
Common abbreviation for Second Life
Task
Server-side representation of a primitive or link set. Since primitives can contain scripts or be physically simulated each task adds load to the server process. The agent is also represented as a task on the server, but has extensive additional processing.
Texture
An image applied to the surface of an object.
UUID
Globally unique identifier, a 128-bit number represented as a 16-byte binary value or 36-byte hexadecimal string. UUIDs can be generated by any part of the system and are guaranteed to be unique. See Wikipedia article on UUIDs.
Vector
An array of floating point values used to represent positions, colors, etc. Implemented in LLVector3, LLVector4, LLColor4, etc.
Viewer
Client software, written in C++, that runs on the user’s Windows, Macintosh, or Linux computer. The process is named “newview” for historical reasons. You may specify Client parameters to it to alter its default behaviour.