OpenSCAD User Manual/3D to 2D Projection

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Using the projection() function, you can create 2d drawings from 3d models, and export them to the dxf format. It works by projecting a 3D model to the (x,y) plane, with z at 0. If cut=true, only points with z=0 will be considered (effectively cutting the object), with cut=false, points above and below the plane will be considered as well (creating a proper projection).

Example: Consider example002.scad, that comes with OpenSCAD.

Openscad projection example 2x.png

Then you can do a 'cut' projection, which gives you the 'slice' of the x-y plane with z=0.

projection(cut = true) example002();

Openscad projection example 3x.png

You can also do an 'ordinary' projection, which gives a sort of 'shadow' of the object onto the xy plane.

projection(cut = false) example002();

Openscad example projection 8x.png

Another Example

You can also use projection to get a 'side view' of an object. Let's take example002, and move it up, out of the X-Y plane, and rotate it:

translate([0,0,25]) rotate([90,0,0]) example002();

Openscad projection example 4x.png

Now we can get a side view with projection()

projection() translate([0,0,25]) rotate([90,0,0]) example002();

Openscad projection example 5x.png

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