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LDraw is a system of free software tools for modeling Lego creations in 3D on a computer. The LDraw file format and original program were written by James Jessiman, although the file format has since evolved. He also modeled many of the original parts in the parts library, which is under continuous maintenance and extension by the LDraw community. In 1997, Jessiman died. Since then, a variety of programs have been written that use the LDraw parts library, and file format. LDraw models are frequently rendered in POV-Ray, a free 3D ray tracer. ==LDraw file format== The LDraw format can divide a model into steps so that the building instructions can be incorporated into the design, and also allows for steps that rotate the camera and even move parts around in an elementary fashion. It also allows for models to be incorporated in the construction of larger models to make design easier. This also makes the file format space efficient: instead of specifying the polygons of every single stud of a specific brick for example, a shared stud file is included multiple times with transformation applied. Parts, models, sub-models and polygons are all treated the same and are not specific to Lego models (only the parts library is). The format could be used to store any type of 3D model. Some have created bricks of other building systems for use with LDraw. LDraw files specifying basic single parts or sub-primitives usually have the extension ''.dat'', Lego models consisting of multiple bricks have the extension ''.ldr'', models consisting of multiple parts and sub-models are called '' *.mpd''. The file format uses plain text data. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「LDraw」の詳細全文を読む スポンサード リンク
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