Wednesday, September 16, 2009


I've packaged up a tarball to make a first release of idfeditor, an application to create and edit the configuration files for Energy Plus building simulation. It can be found at The first release is very basic allowing editing of most elements of the configuration file.

Next is to simplify viewing and editing the building geometry. Energy Plus has a few different ways to represent the information. One way is vertices, with a building element made up of a series of 3d points. The points can be relative to a building basepoint, or zone, the points can be clockwise, counter clockwise, starting at any of the four corners, etc. Or there is another way which has azimuth or facing angle, tilt, origin, length, width. Again from origin. It is quite flexible, meaning quite complicated and error prone.

Right now I'm working on translating the various input types into xyz space, something suitable to transforming, rotating and such. The first goal is to get the code to the point where it reads and writes the data reliably with all the defined input types. The math is fun. I vaguely remember learning all this stuff in school, and have the horrifying memory of doing the calculations on a slide rule. I can't honestly say that it is coming back, that would assume there was some memory remaining. It is all pretty basic vector geometry.

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