From 2f7993b70acf18998fb55bf306bf3cb48ced5c64 Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Tue, 18 Feb 2020 15:51:27 +0800
Subject: [PATCH] add sphere_surface

---
 src/experimental/sphere_surface.scad | 42 ++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 src/experimental/sphere_surface.scad

diff --git a/src/experimental/sphere_surface.scad b/src/experimental/sphere_surface.scad
new file mode 100644
index 00000000..7e5e624d
--- /dev/null
+++ b/src/experimental/sphere_surface.scad
@@ -0,0 +1,42 @@
+use <experimental/surface_grapher.scad>;
+use <experimental/tf_sphere.scad>;
+
+module sphere_surface(levels, radius, thickness, angle = [180, 360], invert = false) {
+    columns = len(levels);
+    rows = len(levels[0]);
+    
+    size = [columns - 1, rows - 1];
+
+    surface1 = [
+        for(r = [0:rows - 1]) 
+        [
+            for(c = [0:columns - 1]) 
+            let(lv = invert ? 255 - levels[c][r] : levels[c][r])
+            [c, r, lv / 255 * thickness]
+        ]
+    ];
+
+    surface2 = [
+        for(r = [0:rows - 1]) 
+        [
+            for(c = [0:columns - 1]) 
+            [c, r, 0]
+        ]
+    ];
+
+    surface_grapher(
+        [
+            for(row = surface1) 
+            [
+                for(p = row) tf_sphere(size, p, radius + thickness, angle)
+            ]
+        ]
+        ,
+        [
+            for(row = surface2) 
+            [
+                for(p = row) tf_sphere(size, p, radius, angle)
+            ]
+        ]
+    );
+}
\ No newline at end of file