![]() In OpenSCAD Extrusion is always performed on the projection (shadow) of the 2d object xy plane and along the Z axis so if you rotate or apply other transformations to the 2d object before extrusion, its shadow shape is what is extruded.Īlthough the extrusion is linear along the Z axis, a twist parameter is available that causes the object to be rotated around the Z axis as it is extruding upward. Linear Extrusion is an operation that takes a 2D object as input and generates a 3D object as a result. 3.2 Extrude parameters for linear extrusion only.3.1 Extrude parameters for all extrusion modes.It is recommended to perform extrusion on shapes that remains strictly on the X-Y plane. What actually happens is that any information in the third coordinate (the Z coordinate) is ignored for any 2D shape, this process amounts to an implicit projection() performed on any 2D shape before the extrusion is executed. While transformations that operates on both 2D shapes and 3D solids can move a shape off the X-Y plane, when the extrusion is performed the end result is not very intuitive. Rotate_extrude() emulates throwing a vesselīoth extrusion methods work on a (possibly disjointed) 2D shape which exists on the X-Y plane. Rotational extrusion is similar to the process of turning or "throwing" a bowl on the Potter's wheel. Linear_extrude() works like a Playdoh extrusion press Linear extrusion is similar to pushing Playdoh through a press with a die of a specific shape. OpenSCAD provides two commands to create 3D solids from a 2D shape: linear_extrude() and rotate_extrude(). The text in its current form is incomplete.Įxtrusion is the process of creating an object with a fixed cross-sectional profile.
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