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LDraw is a three-dimensional Computer Aided Design (CAD) format for creating virtual Lego building block models. It was created by James Jessiman in 1995 and is developed and maintained by the LDraw organization. LDraw files consist of text data that contains geometry, color, and location information for Lego building block models. By using the LDraw format, users can create and share their Lego models, as well as build instructions and other docs. The LDraw format supports many different element types such as sticks, gears, boards, corner blocks, and more. Each element is represented by a unique number and has a predefined 3D geometry and color. These elements can be combined to create more complex models. In addition to manually writing LDraw files using a text editor, various modeling tools such as LDCad, MLCad, and Bricksmith can be used to create and edit LDraw models. LDraw files can be imported into many other CAD software and can also be exported to multiple file formats such as OBJ, STL, and VRML, among others. Overall, the LDraw format is a powerful and flexible tool that can be used to create virtual Lego building block models and is used in areas such as education, game design, and model making.
The 3MF file is a modern 3D file format designed specifically for 3D printable models (additive manufacturing). It aims to be the successor to the popular traditional STL format (also a common format in 3D printing) to overcome its limitations.
The 3MF file format is based on XML and is compressed using standard Zip file compression to generate small, easy-to-transfer files. The format supports 3D meshes as well as all related materials and textures contained in the Zip file.