![]() ![]() Besides DXF files OpenSCAD can read and create 3D models in the STL and OFF file formats. In addition to 2D paths for extrusion it is also possible to read design parameters from DXF files. As data exchange format for this 2D outlines Autocad DXF files are used. OpenSCAD provides two main modelling techniques: First there is constructive solid geometry (aka CSG) and second there is extrusion of 2D outlines. This gives you (the designer) full control over the modelling process and enables you to easily change any step in the modelling process or make designs that are defined by configurable parameters. Instead it is something like a 3D-compiler that reads in a script file that describes the object and renders the 3D model from this script file. Thus it might be the application you are looking for when you are planning to create 3D models of machine parts but pretty sure is not what you are looking for when you are more interested in creating computer-animated movies. Unlike most free software for creating 3D models (such as Blender) it does not focus on the artistic aspects of 3D modelling but instead on the CAD aspects. Setting it to 10 should work fine for most cases.OpenSCAD is a software for creating solid 3D CAD models. The convexity of a 3D shape would be determined in a similar way. This image shows a 2D shape with a convexity of 2, as the ray indicated in red crosses the 2D shapes outside⇒inside (or inside⇒outside) a maximum of 2 times. This parameter is needed only for correct display of the object in OpenCSG preview mode and has no effect on the polyhedron rendering. The convexity parameter specifies the maximum number of front sides (back sides) a ray intersecting the object might penetrate. Since the secondary is wholly within the primary, it leaves a shape with a hole. The secondary shape is subtracted from the primary ( think difference() ). The 2nd path vector,, selects the points,, for the secondary shape. The 1st path vector,, selects the points,, for the primary shape. Polygon(triangle_points,triangle_paths,10) Polygon(points=,], paths=,],convexity=10) Most CAD programs start with 2D views and extrude them into 3D shapes. CSG is about 3D shapes, while there is a way to start with 2D shapes, that is not the required or optimal way to start. It is this that makes OpenSCAD different from many CAD programs. defaults: polygon() yields: polygon(points = undef, paths = undef, convexity = 1) The underlying conceptual system for OpenSCAD is Constructive Solid Geometry. expected path crossings of an arbitrary line through the polygon. convexity Integer number of "inward" curves, ie. A closed shape is created by returning from the last point specified to the first. Secondary shapes may be wholly or partially within the primary shape. Secondary shapes are subtracted from the primary shape (like difference()). multiple vectorsĬreates primary and secondary shapes. May be in a different order and use all or part, of the points listed. If no path is specified, all points are used in the order listed. Parameters points The list of x,y points of the polygon. : A vector of 2 element vectors. In addition it can place holes within that shape. This includes irregular shapes with both concave and convex edges. It can create anything that circle and squares can, as well as much more. A polygon is the most powerful 2D object. The function polygon() creates a multiple sided shape from a list of x,y coordinates. For irregular shapes see the polygon primitive below. One corner points to the positive x direction. These result in the following shapes, where the polygon is inscribed within the circle with all sides (and angles) equal. The following two pieces of code are equivalent.Īngles=) i*(360/order) ] Ĭoords= ] defaults: circle() yields: circle($fn = 0, $fa = 12, $fs = 2, r = 1) Īn ellipse can be created from a circle by using either scale() or resize() to make the x and y dimensions unequal.Ī regular polygon of 3 or more sides can be created by using circle() with $fn set to the number of sides. If they are used, $fa, $fs and $fn must be named parameters. Values of 3 or more override $fa and $fs. $fn : fixed number of fragments in 360 degrees. $fs : minimum circumferential length of each fragment. $fa : minimum angle (in degrees) of each fragment. scale() circle(200) // create a high resolution circle with a radius of 2.ĭ : circle diameter (only available in versions later than 2014.03). Note: These examples exceed the resolution of a 3d printer as well as of the display screen. For a small, high resolution circle you can make a large circle, then scale it down, or you could set $fn or other special variables. ![]() r name is the only one optional with circle.Ĭircle resolution is based on size, using $fa or $fs. ![]()
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