portsalon.blogg.se - Openscad animation example

OPENSCAD ANIMATION EXAMPLE HOW TO
OPENSCAD ANIMATION EXAMPLE CODE

draw a line m' trough Z add an arbitrary angle (the angle is the crank angle).

label the crossing point of h' and v' as fix point Y.

draw a vertical line v' distance a left from v.

draw a horizontal line h' distance l down from h.

that will be the origin of this construction and crank axis of the leg mechanism.

draw a vertical line v crossing the horizontal line h.

lines and arcs used for construction have a '.Geometric Construction Instructions Conventions The rest is more or less "rinse and repeat". Given that we already know the general shape of the mechanism, we know which one we need. Note that when two points and two lengths are given, there are always two solutions, speak crossing points. The crossing point of the arcs is the point W. Then we set the compass to the length j and put the compass in point X. Let us start with setting the compass to length b and then putting the compass in point Y. On paper, this can be easily solved using a compass. In geometry, this is the SSS case (constructing a Triangle with three sides given, see also Solution of triangles#Three sides given (SSS)). The crank m can be at an arbitrary angle.ĭrawing the crank results in the point X.įrom this point, we construct triangles that are defined by two points and two lengths. We set the origin Z to an arbitrary point.įor Y, we are going down l and a to the left. We need a non collapsible compass, a ruler, paper and a pencil. Now we have to think about how we could construct the mechanism by hand. It can be very helpful to print out the drawing to scribble on.Ĭonstruction by hand I have used Z.S to avoid confusion with the lengths a.m. Theo Jansen has published the numbers on his website: (Video "The Legsystem", 3:36) or on archived version the webpage: Constants

OPENSCAD ANIMATION EXAMPLE HOW TO

You need to have OpenSCAD installed and need to have a basic understanding in how to use OpenSCAD.Ī basic understanding of geometry is necessary to understand on how to construct the linkage on paper and how to use the functions which are used to calculate the linkage.Īn understanding of trigonometry is helpful to understand the math behind the functions, but it is not strictly necessary.įirst of all, we need a drawing with the constants.

OPENSCAD ANIMATION EXAMPLE CODE

The source code is just one file without the use of external libraries, tested with OpenSCAD version 2015.03. This chapter describes how to animate a complex mechanism like the strandbeest using OpenSCAD. 11.1 Wrong Angle / Missing measurement / TiltĪbstract Strandbeest in Linz.11 Next when building the mechanism with a different method.4.1 Geometric Construction Instructions.