Wide band pattern ring

Example of a wide band ring with a pattern along it, I have made it with FreeCAD 0.17 using helix and some surface and solid element tools.

Ejemplo de un anillo de banda ancho con un patrón a lo largo de él. Lo he hecho con FreeCAD 0.17 y algunas herramientas de superficie y elementos sólidos.

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I have added an OpenSCAD model also, but the edges don't look very good.
También he añadido un modelo OpenSCAD, pero los bordes no quedan bien.


The OpenSCAD model is based on a matrix with values ranging from 0 to 15, these matrix numbers define winch elements are subtracted from the surface. Each matrix element defines four triangles, they are based on a rectangle with four divisions from hte center to the four corners. To remove the right element, add 1 to that matrix, to remove the top element add 2, 4 for the left element and 8 for the bottom element (4 bits or half byte).

El modelo OpenSCAD está basado en una matriz con valores que van de 0 a 15, estos números de la matriz