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) defaults: polygon() yields: polygon(points = undef, paths = undef, convexity = 1) 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.
Openscad center code#
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. Parameters: size single value, square with both sides this length 2 value array, rectangle with dimensions x and y center false (default), 1st (positive) quadrant, one corner at (0,0) true, square is centered at (0,0) default values: square() yields: square(size =, center = false) Ĭreates a circle at the origin. Argument names are optional if given in the order shown here. When center is true the square is centered on the origin. Note: The try to substract with difference() from 3D object will lead to unexpected results in final rendering.Ĭreates a square or rectangle in the first quadrant. Although they are infinitely thin, they are rendered with a 1 thickness. They are usually used as part of a 3D extrusion.
4.3.2 Extrude parameters for linear extrusion onlyĪll 2D primitives can be transformed with 3D transformations.4.3.1 Extrude parameters for all extrusion modes.1.3.4 Extruding a 3D shape from a polygon.
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