File structureĪ CAD document comprises one model space and zero or more paper spaces. It is much more easily shared between programs (even Inkscape) and I find that LibreCAD is a really lightweight way of browsing floor plans in this format. I prefer the ASCII version as it is human readable but the downside is that it is uncompressed and so file sizes have the potential to be large. It’s not very useful on its own so I found it best to convert to DXF using the open source file converter provided by the Open Design Alliance.ĭXF is short for design exchange format, and comes in binary and ASCII flavours. DWG is meant as shorthand for drawing, and is a proprietary file format belonging to AutoCAD. There are generally two file types in the world of CAD: DWG and DXF. I’ll present the solution in Part 2, but first here is what I learned about the structure of CAD files that I needed before writing an extraction utility. The alternative was to programmatically scrape the CAD file for seat ID and X and Y coordinates. The original scope allowed for us to rely on another team to manually encode the distances between each desk on each floor, but there are many downsides to this approach: human error costly rework when plans change lack of ability to iteratively improve on feature extraction and huge risk of schedule overrun when modelling has to wait on this input data. As we intend to optimise team locations down to the seat level within a floor, we were given floor plans in both pdf and dwg file formats. Recently at work a project came up that involved the optimisation of building occupancy during the refit of a 16 floor central London office block. This is the first part of a series of posts describing my experience of extracting objects from a CAD document.
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