Better pseudorandom numbers

visgl · Nov 7, 2019 · 6048cc8 · 6048cc8
1 parent eb4a332
commit 6048cc8
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Showing 4 changed files with 9 additions and 2 deletions.
diff --git a/examples/utils/index.js b/examples/utils/index.js
@@ -1,7 +1,14 @@
 // Create a deterministic pseudorandom number generator
 export function getRandom() {
-  let i = 0;
+  let s = 1;
+  let c = 1;
   return () => {
-    return Math.abs(Math.sin(i++ * 17.23) * Math.cos(i++ * 27.92));
+    s = Math.sin(c * 17.23);
+    c = Math.cos(s * 27.92);
+    return fract(Math.abs(s * c) * 1432.71);
   };
 }
+
+function fract(n) {
+  return n - Math.floor(n);
+}
diff --git a/test/render/golden-images/instancing.png b/test/render/golden-images/instancing.png
diff --git a/test/render/golden-images/persistence.png b/test/render/golden-images/persistence.png
diff --git a/test/render/golden-images/transform.png b/test/render/golden-images/transform.png