Parametric Column, Cylinder with varying radius

thingiverse

In this openSCAD file, you can learn how to create cylinders with varying radii as a response to http://www.thingiverse.com/thing:21868. The file is by elindow and it features a Doric Temple Building Set. The radius of the column now varies according to its height. The program draws cones of height dh+e on top of each other, overlapping by e=0.02 for a continuous object without internal parallel faces. The lower and upper radii of the cone are determined by specific formulas involving total height, number of slices, and height index i. You can replace the r-function to create your own custom shapes. The file includes various functions that define the radius of the column at different heights, such as straight, quadratic (convex or concave), sinusoidal, and a 1/x function with specific divergence points.