openscad/dotSCAD
1
0
Fork 0
mirror of https://github.com/JustinSDK/dotSCAD.git synced 2025-08-13 10:14:41 +02:00
Code Issues Releases Wiki Activity

21-nearest-neighbor

Browse Source
This commit is contained in:
Justin Lin
2020-04-02 14:30:28 +08:00
parent 353981870e
commit 611288700a
1 changed files with 26 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
src/experimental/voronoi_nn.scad
View File

@@ -3,20 +3,29 @@ module voronoi_nn(size, cell_w, seed, spacing = 1, r = 0, delta = 0, chamfer = f
function _lookup_noise_table(i) = _noise_table[i % 256]; function _lookup_noise_table(i) = _noise_table[i % 256];
// 25-nearest-neighbor function cell_pt(fcord, seed, x, y) =
function _neighbors(fcord, seed, cell_w) = [
for(y = [-2:2])
for(x = [-2:2])
let( let(
nx = fcord[0] + x, nx = fcord[0] + x,
ny = fcord[1] + y, ny = fcord[1] + y,
sd_base = abs(nx + ny * cell_w), sd_base = abs(nx + ny * cell_w),
sd1 = _lookup_noise_table(seed + sd_base), sd1 = _lookup_noise_table(seed + sd_base),
sd2 = _lookup_noise_table(sd1 * 255 + sd_base), sd2 = _lookup_noise_table(sd1 * 255 + sd_base)
nbr = [(nx + sd1) * cell_w, (ny + sd2) * cell_w]
) )
nbr [(nx + sd1) * cell_w, (ny + sd2) * cell_w];
];
// 21-nearest-neighbor
function _neighbors(fcord, seed, cell_w) =
concat(
[
for(y = [-1:1])
for(x = [-1:1])
cell_pt(fcord, seed, x, y)
],
[for(x = [-1:1]) cell_pt(fcord, seed, x, -2)],
[for(x = [-1:1]) cell_pt(fcord, seed, x, 2)],
[for(y = [-1:1]) cell_pt(fcord, seed, -2, y)],
[for(y = [-1:1]) cell_pt(fcord, seed, 2, y)]
);
region_size = cell_w * 3; region_size = cell_w * 3;
half_region_size = 0.5 * region_size; half_region_size = 0.5 * region_size;
@@ -43,10 +52,10 @@ module voronoi_nn(size, cell_w, seed, spacing = 1, r = 0, delta = 0, chamfer = f
sd, sd,
cell_w cell_w
), ),
p = nbrs[12], p = nbrs[4],
points = concat( points = concat(
[for(i = [0:11]) nbrs[i]], [for(i = [0:3]) nbrs[i]],
[for(i = [13:24]) nbrs[i]] [for(i = [5:len(nbrs) - 1]) nbrs[i]]
) )
) )
[p, points] [p, points]