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D3DX
In computing, D3DX (Direct3D Extension) is a deprecated high level API library which is written to supplement Microsoft's Direct3D graphics API. The D3DX library was introduced in Direct3D 7, and subsequently was improved in Direct3D 9. It provides classes for common calculations on vectors, matrices and colors, calculating look-at and projection matrices, spline interpolations, and several more complicated tasks, such as compiling or assembling shaders used for 3D graphic programming, compressed skeletal animation storage and matrix stacks. There are several functions that provide complex operations over 3D meshes like tangent-space computation, mesh simplification, precomputed radiance transfer, optimizing for vertex cache friendliness and strip reordering, and generators for 3D text meshes. 2D features include classes for drawing screen-space lines, text and sprite based particle systems. Spatial functions include various intersection routines, conversion from/to barycentric coordinates and bounding box/sphere generators.
The D3DX library contains pre-written routines for doing things common to most 2D/3D applications, such as games. Since the Direct3D API is relatively low-level, using the D3DX library is usually much simpler.
In 2012, Microsoft announced that D3DX would be deprecated in the Windows 8 SDK, along with other development frameworks such as XNA. Shader effects, texture management, geometry optimizations and mesh models are available as separate sources published through CodePlex.〔(【引用サイトリンク】title=Living without D3DX )〕 The mathematical constructs of D3DX, like vectors and matrices, would be consolidated with XNAMath into a DirectXMath and spherical harmonics math is provided as separate source.〔
==Interfaces==
The D3DX library follows the COM object oriented programming model. Functionality is accessed using C++-like interfaces.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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