Add sketch, expose a couple more ops

core/scene.js

@@ -123,6 +123,9 @@ const ops = {
     }
   },
 
+  fillBox,
+  makeHollowShell,
+
   randomBox: (scene, val) => {
     fillBox(scene, randVec(scene), randVec(scene), val);
   },
@@ -162,9 +165,7 @@ const ops = {
     }
   },
 
-  worm: (scene, startVec, size, moveRepeat, kind) => {
-    worm(scene, startVec, size, moveRepeat, kind);
-  }
+  worm,
 };
 
 module.exports = {

sketches/sketch020.js

@@ -0,0 +1,26 @@
+const {makeSketch} = require('./util');
+
+makeSketch({x: 128, y: 128, z: 128}, {padFrac: 0.1}, (scene, ops) => {
+/*
+  for (let i = 0; i < 256; i++) {
+    ops.randomShell(scene, 1);
+  }
+  const IN = 32;
+  ops.predicateFill(scene, 0, (x, y, z) => ((x < IN) || (y < IN) || (x >= (scene.size.x-IN)) || (y >= (scene.size.y-IN)) || (z >= 32)));
+*/
+
+  ops.makeHollowShell(scene, {x: 0, y: 0, z: 0}, {x: scene.size.x, y: scene.size.y, z: 8}, 1);
+  ops.predicateFill(scene, 0, (x, y, z) => ((y % 16) < 6));
+
+  for (let i = 0; i < 128; i++) {
+    ops.worm(scene, {x: 64, y: 64, z: 64}, 1+Math.floor(3*Math.random()), 2+Math.floor(2*Math.random()));
+  }
+
+  const RAD = 6;
+  ops.makeHollowShell(scene, {x: 64-RAD, y: 64-RAD, z: 0}, {x: 64+RAD, y: 64+RAD, z: 128}, 1);
+
+  // ops.predicateFill(scene, 0, (x, y, z) => ((x % 16) < 4));
+  // ops.predicateFill(scene, 0, (x, y, z) => ((z % 16) < 4));
+
+  ops.frontCutaway(scene, 0.5);
+});