典型开源3D引擎分类比较

常见的3D引擎有：Unreal、Quake、Lithtech、OGRE、Nebula、Irrlicht、Truevision3D...

其中开源免费的有：OGRE、irrlicht、fly3d、NeoEngine、revolution3d、 Nebula2、Genesis3d等。

OGRE在免费、开源的引擎中评价最高，一个原因是作为一个图形渲染引擎，它支持的图形特性最多，所以渲染质量也不错；另一个原因是设计模式的清晰；另外，速度也不错。

OGRE将专注于向一个纯粹的、然而富于协作和扩展性的图形引擎发展，这得益于它的庞大的社群支持，使得很多事情可以通过外挂一些更专业的引擎来实现，物理引擎使用ODE、Tokamak、NovodeX，网络引擎使用openTNL、RakNet、eNet，声音引擎使用FMod、OpenAL，以及界面引擎使用CEGUI。

Standard	OGRE	IrrLicht	Truevision3D
General
Type	Only rendering engine		Game engine IncludeTV3DEngine,TV3DMedia,TV3DNet……
Languages	Written in pure C++, totally object orientated.	Written in pure C++, totally object orientated.	Written in C++ and VB6 with DirectX8.1
License	LGPL	zlib/libpng License(totally free)	·Free TV3DSDK ·Registered Developer License ·group or site licenses
Develop platforms	·C++ ·.NET	·C++ ·.NET language binding	VB/VC++/DELPHI/ C#/vb.net
Platforms
Windows	Support	Support	Support
Linux	Support	Support
MacOS	Support	Support
3D API
Direct3D	Support	Support	Support
OpenGL	Support	Support
Other		·The Irrlicht Enginesoftware renderer. ·The Apfelbaum Software Renderer
Architecture
Extensibility	·Extensible example framework ·Flexible plugin architecture allows engine to be extended without recompilation ·Use some other professional engines to achieve other features
Scripting
Materials & Textures
Materials	·Powerful material declaration language ·Multiple material ·Material LOD ·Multi-texture and multi-pass blending ·Projective texturing ·Textures can be provided and updated in real-time by plugins	·Provide common built in materialsbased on fixed function pipeline or programmable pipeline ·add new materials to Irrlicht at runtime, without the need of modifying/recompiling the engine
Textures and Mapping	自动产生MipMap； 自动调整纹理大小以满足硬件需求。 支持可程序控制的纹理坐标生成和转换。	·Bump mapping ·Parallax mapping ·Light maps ·Sphere mapping	DOT3 Bump mapping 没有提供多层纹理和混合模式
Shaders	·Supports vertex and fragment programs, both written in assembler, and in Cg, DirectX9 HLSL, or GLSL ·Support many commonly bound constant parameters like worldview matrices, light state information, object space eye position etc	·Pixel and Vertex Shaders 1.1 to 3.0 ·ARB Fragment and Vertex Programs ·HLSL ·GLSL	·Hardware Vertex Shaders ·HLSL
Scene Management
General	·Highly customizable, flexible scene management, not tied to any single scene type. ·Hierarchical scene graph; nodes allow objects to be attached to each other and follow each others movements, articulated structures etc ·Scene querying	·Using a hierarchical scene graph, can mix indoor and outdoor scene seamless together ·Extensiblehierarchical scene management
BSP Support	BSP场景的天空穹、粒子特效、高级材质属性，乃至BSP的空间分割规则都会被正确识别、自动实现	·对BSP的特性支持比较贫乏	对BSP的读取存在BUG
Other
Special effects
Particle System	·easily extensible emitters, affectors and renderers ·can be defined in text scripts for adjusting in real-time ·particle pooling	·CustomizeableParticle systems for snow, smoke, fire, ...	Atmospheric effects like fog, cloud, sky (box and sphere), stars.
Light & Shadow	当前支持三种阴影：调整纹理阴影,调整模版阴影,附加模板阴影。不支持软阴影 Multiple shadow rendering techniques,	·Dynamiclights ·Dynamic shadowsusing the stencil buffer	·Optimized dynamic stencil shadows ·DirectX Hardware Lighting
Other	·Support for skyboxes, skyplanes and skydomes ·Billboarding for sprite graphics ·Transparent objects automatically managed	·Realistic watersurfaces ·Billboards ·Transparent objects ·Skyboxes ·Fog ·Texture animation	Billboard
Character Animation
	·Skeletal animation ·blending of multiple animations ·variable bone weight skinning ·hardware-accelerated skinning	·Morph target animation: ·Skeletal animation	·Skeleton based, Key frame based, morph based animations ·Animations that can be enhanced by bone attaching or custom bone rotations.
Supported Formats
textures file formats	·PNG, JPEG, TGA, BMP or DDS ·1D textures, volumetric textures, cubemaps and compressed textures (DXT/S3TC)	·PSD,JPG,PNG,TGA,BMP,PCX
mesh file formats	Milkshape3D, 3D Studio Max, Maya, Blender and Wings3D	·3DS,OBJ,CSM,DAE,DMF,OCT,X,MS3D,MY3D,LMTS,BSP,MD2	3DS, X, MDL, MD2, MD3
Document
	Great number of users and well documented.	well documented APIwith lots of examples and tutorials.
Other
GUI
2D Drawing
XML	üSupport XML Converter: convert efficient runtime binary formats to/from XML for interchange or editing	üSupport 快速的XML分析器
Web Site
	http://www.ogre3d.org.sixxs.org	http://irrlicht.sourceforge.net.sixxs.org	http://www.truevision3d.com.sixxs.org