• Three-dimensional impossible CAD

    calendar Jan 10, 2021 · 4 min read · geometry CAD  ·
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    Recently I friend and I wrote a semi-serious paper called "The geometry of impossible objects" to be delivered at a mathematics technology conference. The reviewer was not hugely complimentary, saying that there was nothing new in the paper. Well, maybe not, but we had fun pulling together some information …
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  • A test of OpenJSCAD

    calendar Sep 15, 2018 · 1 min read · CAD  ·
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    Here's an example of a coloured tetrahedron:

    <div oncontextmenu="return false;"
     id="viewerContext"
     style = "width:640px;height:470px;"
     design-url="tetrahedron.jscad"></div>

    <div id="tail" …

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  • Programmable CAD

    calendar Nov 24, 2017 · 3 min read · CAD  ·
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    Every few years I decide to have a go at using a CAD package for the creation of 3D diagrams and shapes, and every time I give it up. There's simply too much to learn in terms of creating shapes, moving them about, and so on, and every system seems to have its own ways of doing things. My son (who is an expert in …
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