From bc3b43190ac5233013c555c9f027c2e6f77a5a00 Mon Sep 17 00:00:00 2001
From: Scott Worley <ScottWorley@ScottWorley.com>
Date: Fri, 28 Dec 2012 23:34:08 -0800
Subject: [PATCH 1/1] Warn about NaNs in the output model

---
 nt3d.js | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/nt3d.js b/nt3d.js
index 2876698..33e271b 100644
--- a/nt3d.js
+++ b/nt3d.js
@@ -318,10 +318,33 @@ nt3d = {
 
 		// Run user_function
 		this.points = this.user_function.apply(null, params);
+
+		// Do a little validation
 		if (this.points.length % 3 != 0) {
 			alert("Points list length not divisble by 3!");
 		}
 		var n = this.points.length / 3;
+		var nan_count = 0;
+		var nan_point_count = 0;
+		var nan_face_count = 0;
+		for (var i = 0; i < n; i++) {
+			var nan_in_face = false;
+			for (var j = 0; j < 3; j++) {
+				var nan_in_point = false;
+				for (var k = 0; k < 3; k++) {
+					if (isNaN(this.points[i*3+j][k])) {
+						nan_count++;
+						nan_in_point = true;
+						nan_in_face = true;
+					}
+				}
+				if (nan_in_point) nan_point_count ++;
+			}
+			if (nan_in_face) nan_face_count ++;
+		}
+		if (nan_count != 0) {
+			alert(nan_count + " NaNs in " + nan_point_count + " points in " + nan_face_count + " faces.");
+		}
 
 		// Make STL
 		this.stl = "solid " + this.user_function.name + "\n";
-- 
2.44.1