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Use OpenSCAD Circle resolution to speed up ribbed cylinder creation

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Arthur Moore 2024-05-02 09:20:22 -04:00
parent 2245dd097c
commit 43b0b350a4
1 changed files with 16 additions and 2 deletions
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18
gridfinity-rebuilt-holes.scad
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@ -6,12 +6,24 @@
include <standard.scad> include <standard.scad>
use <generic-helpers.scad> use <generic-helpers.scad>
/**
* @brief Determines the number of fragments in a circle. Aka, Circle resolution.
* @param r Radius of the circle.
* @details Recommended function from the manual as a translation of the OpenSCAD function.
* Used to improve performance by not rendering every single degree of circles/spheres.
* @see https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_Language_Features#Circle_resolution:_$fa,_$fs,_and_$fn
*/
function get_fragments_from_r(r) =
assert(r > 0)
($fn>0?($fn>=3?$fn:3):ceil(max(min(360/$fa,r*2*PI/$fs),5)));
/** /**
* @brief Wave generation function for wrapping a circle. * @brief Wave generation function for wrapping a circle.
* @param t An angle of the circle. Between 0 and 360 degrees. * @param t An angle of the circle. Between 0 and 360 degrees.
* @param count The number of **full** waves in a 360 degree circle. * @param count The number of **full** waves in a 360 degree circle.
* @param range **Half** the difference between minimum and maximum values. * @param range **Half** the difference between minimum and maximum values.
* @param vertical_offset A simple offset. * @param vertical_offset Added to the output.
* When wrapping a circle, radius of that circle.
* @details * @details
* If plotted on an x/y graph this produces a standard sin wave. * If plotted on an x/y graph this produces a standard sin wave.
* Range only seems weird because it describes half a wave. * Range only seems weird because it describes half a wave.
@ -41,9 +53,11 @@ module ribbed_circle(outer_radius, inner_radius, ribs) {
wave_range = (outer_radius - inner_radius) / 2; wave_range = (outer_radius - inner_radius) / 2;
wave_vertical_offset = inner_radius + wave_range; wave_vertical_offset = inner_radius + wave_range;
fragments=get_fragments_from_r(wave_vertical_offset);
degrees_per_fragment = 360/fragments;
// Circe with a wave wrapped around it // Circe with a wave wrapped around it
wrapped_circle = [ for (i = [0:360]) wrapped_circle = [ for (i = [0:degrees_per_fragment:360])
[sin(i), cos(i)] * wave_function(i, ribs, wave_range, wave_vertical_offset) [sin(i), cos(i)] * wave_function(i, ribs, wave_range, wave_vertical_offset)
]; ];