In order to describe the bricks, Jessiman defined a file-format, a set of rules to describe a LEGO brick within a single text file, and an editor called LEdit. In 1995, James Jessiman created LDraw, a program originally intended to create images of LEGO bricks. Virtual building is a form of 3D CAD (Computer-Aided Design). Lets first look at some history and define some terms. It serves as a general inroduction to a three part series: Guide to LEGO Digital Designer, Guide to Stud.io and Guide to Rendering. This help page will explain the background behind virtual building and what software you need to use. These files contain virtual models, and you need special software to view and build these models.

However, many other MOCs have their instructions in other formats: Many Rebrickable MOCs have instructions in the form of a PDF file, that contains a series of photographs showing different stages of building. All of that can be done on almost any computer, and almost any operating system.

Besides the obvious more bricks, more colors, and easy searching a virtual model can be used to generate building instructions, and it can be rendered, in other words, the model can be used to create photo-realistic images. Surely, it is much more fun to build with real bricks, but virtual building has several advantages. Virtual building means building a LEGO model on a computer, using virtual LEGO bricks. Did you ever wish you had more LEGO Bricks? Or wish you had a certain LEGO brick in another color? Did you ever wish you could instantly find a particular LEGO brick? If so, you should really try virtual building.

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