add worley_noise_ball

2025-08-09 16:26:47 +02:00 · 2020-04-04 18:01:23 +08:00
parent 536ef5e518
commit 78a50a50e0
1 changed files with 58 additions and 0 deletions
--- a/examples/worley_noise_ball.scad
+++ b/examples/worley_noise_ball.scad
@@ -0,0 +1,58 @@
+use <noise/nz_worley3s.scad>;
+use <sweep.scad>;
+
+radius = 25;
+a_step = 5;
+cell_w = 10;
+dist = "euclidean"; // [euclidean, manhattan, chebyshev, "border"] 
+noise_style = "CELL_R";    // [CELL_R, NOISE]
+noise_factor = 1;
+seed = rands(0, 255, 1)[0];
+
+module worley_noise_ball() {
+    theta_tau_lt = [ 
+        for(tau = [-90:a_step:90])
+            [for(theta = 360; theta >= 0; theta = theta - a_step)
+                [theta, tau]]
+    ];
+
+    function to_xyz(polar) = 
+        let(
+            r = polar[0],
+            theta = polar[1],
+            tau = polar[2],
+            z = r * sin(tau),
+            r2 = r * cos(tau),
+            x = r2 * cos(theta),
+            y = r2 * sin(theta)
+        )
+        [x, y, z];
+        
+
+    cells = [
+        for(row = theta_tau_lt)
+            nz_worley3s(
+                [for(theta_tau = row) to_xyz([radius, theta_tau[0], theta_tau[1]])], 
+                seed, 
+                cell_w, 
+                dist
+            )
+    ];
+
+    sections = [
+        for(ri = [0:len(theta_tau_lt) - 1])
+        [
+            for(ci = [0:len(theta_tau_lt[0]) - 1])
+            let(
+                theta_tau = theta_tau_lt[ri][ci],
+                off_r = noise_style == "CELL_R" ? norm([cells[ri][ci][0], cells[ri][ci][1], cells[ri][ci][2]]) : cells[ri][ci][3],
+                nr = radius + off_r * noise_factor
+            )
+            to_xyz([nr, theta_tau[0], theta_tau[1]])
+        ]
+    ];
+
+    sweep(sections);
+}
+
+worley_noise_ball();