Fix plane generator for axis-aligned planes

swiftcoder · swiftcoder · commit ef70ac4649eb · 2017-05-21T08:05:00.000-07:00
diff --git a/js/app.js b/js/app.js
@@ -44911,6 +44911,9 @@ function cube(size) {
 function plane(p, n, size) {
     n = n.normalize().negate();
     var m = new THREE.Vector3(0, 0, 1);
+    if (Math.abs(m.dot(n)) < 0.01) {
+        m = new THREE.Vector3(1, 0, 0);
+    }
 
     var a = n.clone().cross(m);
     var b = a.clone().cross(n);
diff --git a/src/csg.js b/src/csg.js
@@ -143,6 +143,9 @@ function cube(size) {
 function plane(p, n, size) {
     n = n.normalize().negate();
     let m = new THREE.Vector3(0, 0, 1);
+    if (Math.abs(m.dot(n)) < 0.01) {
+        m = new THREE.Vector3(1,0,0);
+    }
 
     let a = n.clone().cross(m);
     let b = a.clone().cross(n);
