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Unreal Engine 2 provides a complete solution that has stood the tough test of real-world game development. All of Unreal’s components have been designed together; they provide a consistent programming interface, and they fully interoperate. Even when we’ve opted for a third-party solution for a specific subsystem, we’ve worked directly with the team providing the code to make sure it’s a tight fit.

Author Epic Games
Graphics API OpenGL, DirectX,
Software Operating Systems Windows, Linux, MacOS, Xbox, Playstation, GameCube
Programming Language C/C++ Status Productive/Stable
Documentation Yes

Features

General Features Object-Oriented Design, Plug-in Architecture, Save/Load System:
• Four distinct geometry types allow for highly detailed levels with reduced design time through instanced, reusable content.
• Adaptable to several different game types including but not limited to First Person Shooters, to Real Time Strategies, to 3rd Person Action Adventure.
• 64-bit Windows and Linux ports using AMD Hammer x86-64 available
• Object-oriented, highly expandable in-game UI and control system
• Native support for localization of text to UNICODE via replaceable fonts
Scripting
• Built-in UnrealScript and C++ support for externalization of all text, enabling non-programmer translation
• Programming APIs in C++ and UnrealScript, an interpreted, object-oriented language similar to Java
Built-in Editors
• UnrealEd is a real-time level design tool based on constructive solid geometry, optimized through its use in multiple released games for building real-time 3D environments. It fully integrated into the Unreal engine: the camera views are What You See Is What You Get. All lighting, texture placement and geometry operations take place immediately
• Built-in UnrealScript profiling, as well as comprehensive game, engine and networking performance counters
• Separate UnrealScript debugging application eases testing of complicated scripts, including breakpoints, variable watches and more
Physics Basic Physics, Collision Detection, Rigid Body, Vehicle Physics:
• Integrated physics-driven animation eases network programming and animation replication
• Collision cylinders provide highly optimized collision detection for humanoid characters and items.
• Convex collision volumes allow for simplified, optimized collision for geometrically complex map areas.
• Integrated Karma 1.2 rigid body physics engine allows for ragdoll physics, dual vehicle physics systems and more (Karma license included with license at no additional cost)
Lighting Per-vertex, Lightmapping:
• Static lighting through the use of vertex coloring and light maps for high resolution lighting without the runtime calculation overhead.
• Multiple light types are supported: directional, point lights, and spot lights.
• Numerous light effects (blinking, wavering, etc.) for dynamic lights.
Shadows Shadow Mapping:
Texturing Basic, Multi-texturing, Projected:
• Projected textures allow the simulation of complex dynamic lighting and shadowing effects on all surfaces, including player shadows and flashlights.
• Many operations supported, such as panning, alpha blending, modulation and more.
• Easy to use mechanism for scrolling, rotating, and scaling textures via artist settings.
• All textures support up to twelve levels of mip-mapping, including mipping down to a solid color.
• Texture animation sequences with variable playback rate.
Scene Management General, BSP, Portals, Occlusion Culling, PVS, LOD:
• DSG (dynamic scene graph) is a natural extension of portal technology. A dynamic scene graph consists of a root node, corresponding to the player’s immediate surroundings, and a hierarchical tree of child nodes.
• Enhanced portal-based visibility system includes “antiportal” occluders, supported as two dimensional sheets or three dimensional volumes, to cull objects or portals within a zone.
• Real-time scenes of 10,000 to 100,000 or more fully textured and lit polygons in view are common.
Animation Keyframe Animation, Skeletal Animation, Animation Blending:
• Skeletal animated characters average 2000-3000 polygons each, driven by some 30 bones, with two to three influences per vertex.
• Interpolation support enables perfectly fluid animation at high frame rates
• Tweening support allows smooth flow between disjoint animation sequences.
• Multiple channels of animation, each with a variable blending percentage, allows for several animations to be played simultaneously.
• Skeletal mesh compression
Meshes Mesh Loading, Skinning:
• Instanced geometry can either be rendered batched by material or not for additional memory usage versus frame rate flexibility.
• Only practical limits on polygon count.
Special Effects Lens Flares, Billboarding, Particle System, Sky, Water, Explosion, Decals, Fog, Mirror:
• Non-Euclidean, redirectable “warp” portal effects for seeing through teleporters
• Comprehensive particle system allows for diverse configurations, supporting sprites, meshes, lines, beams, all with collision, a multitude of movement, lifetime and texture options, and all manipulatable in real-time in the editor.
• Fluid surfaces allow for dynamic water simulation, supporting ambient ripples, targeted oscillations (for player or other disturbances), clamping for realistic wave boundaries, surface vertex alpha blending for texture effects and more, all independent of water physics.
• Distance fog provides a greater sense of depth indoors and out, while additionally improving rendering performance in large outdoor areas.
• Real-time, in-engine movies (machinima) support through “Matinee” functionality provides comprehensive camera, actor and effects direction.
Terrain Rendering, CLOD:
• Eight- and sixteen-bit heightmap terrain system allows for fast, complex terrain rendering with smooth gradients and dynamic addition and subtraction of chunks in real-time.
• Texture layers allow you to have multiple textures atop the heightmap with variable eight-bit alpha for seamless transitions and easy creation of non-repeating land.
• Comprehensive suite of terrain manipulation tools allows you to raise, lower, raze and flower the heightmap in real time.
• Decoration layers allow for coarsely sorted flora detail such as grass.
Networking System Client-Server:
• Advanced game networking capabilities with years of refinements
• Support both small LAN games and large-scale, server-based Internet games
• Network code tolerates low-bandwidth connections with up to 300ms latency and 15% packet loss
• Gamers can travel between Unreal servers much like browsing web pages, with teleporters providing links between servers
• Automatic downloading of new content (levels, textures, sound, models, scripts) while browsing Unreal servers
• Java-style client-side scripting (simulation) enables high performance even over high latency connections
• Comprehensive script-side TCP and UDP networking support, as well as game-relation functionality such as replication, priority management, reliability and remote procedure calls
Sound & Video 2D Sound, 3D Sound:
• Standards compliant OpenAL-based audio subsystem on Windows, Linux and Macintosh, DirectSound3D-based on Xbox.
• supports 3D spatialization, attenuation, pitch and Doppler shifting
• supports EAX 3.0 effects on compatible cards
• Ogg Vorbis streaming sound and music support on Windows, Linux and Macintosh
• includes OpenAL wrapper with 100% software fallback path
Artificial Intelligence Pathfinding, Decision Making, Finite State Machines, Scripted:
• Built-in state-based AI support for advanced creatures and bots
• Bots know how to use all player movement options, weapons and inventory.
• Bots know how to use switches, ladders, navigate past platforms, use doors, snipe and more.
• Physics-based AI makes complex actor movement straightforward
• Animation system ties into AI via notification system, with animation playing, blending, tweening, looping, and other triggers, such as footstep sounds.
• Pathnode-based AI navigation system supports complex route evaluation, alarm points, and more.
• AI properties are exposed to level designers for setting up patrol routes, individual creature moods and more.
Rendering Fixed-function:
• Semi-reflective materials, such as marble surfaces which partially reflect light
• Rendering subsystems include Direct3D, OpenGL, and RAD Game Tools’ Pixomatic software renderer for Windows PCs (no cost).
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