Monday, August 24, 2015

Shadow cube - 3D model of C-A-D

Shadow cubes are an interesting design challenge, checking your imagination and your design skills in the 3D CAD software of your choice. The goal is to design a 3D model, that casts three different letters as a shadow in the individual orthographic views (top, side, front - X, Y, Z). So e.g. "C" in the top view, "A" in the side view and "D" in the front view. Start your Inventor, Fusion 360 or 123D Design and test yourself designing such model for an arbitrary combination of 3 letters. Be warned, some combinations are very difficult.

If you dare to endanger your own Karma by an innocent cheat, you can seek help through a useful tool, the programmers CAD modeler OpenSCAD. In this application, enter the following script and generate the 3D model by pressing F6.

// podle: UlrichB1


S=10; // size in mm

// "C" "A" "D" - modelled letters

intersection() {
 M("A", S); // "A"
 translate([0, S, 0])rotate([90, 0, 0]) M("D", S); // "D"
 translate([-S/2, S/2, 0])rotate([90, 0, 90])M("C", S); // "C"

 module M(t,s) {
 resize([s, s, s])linear_extrude(1) text(t, halign="center", font="Raavi:style=Bold");

Then you can export your model e.g. to the STL format - for 3D print or for further processing in another CAD application. If you want to get it into AutoCAD, you can use the conversion service STL2DWG. A sample AutoCAD model can be downloaded from the CAD/BIM block library, or viewed interactively through the online viewer A360:

The model in Fusion 360:

via Instructables and InventorGuru

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