From bb683c9291592144f1a51745341f1294d14cd553 Mon Sep 17 00:00:00 2001
From: sapics <gv.nishino@gmail.com>
Date: Mon, 20 Jun 2016 09:52:09 +0900
Subject: [PATCH] Remove same value solution in solveCubic

---
 src/util/Numerical.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/util/Numerical.js b/src/util/Numerical.js
index b81718d8..42457699 100644
--- a/src/util/Numerical.js
+++ b/src/util/Numerical.js
@@ -356,8 +356,8 @@ var Numerical = new function() {
             }
             // The cubic has been deflated to a quadratic.
             var count = Numerical.solveQuadratic(a, b1, c2, roots, min, max);
-            if (isFinite(x) && count >= 0
-                    && (count === 0 || x !== roots[count - 1])
+            if (isFinite(x) && (count === 0
+                    || count > 0 && x !== roots[0] && x !== roots[1])
                     && (min == null || x > min - EPSILON && x < max + EPSILON))
                 roots[count++] = min == null ? x : clamp(x, min, max);
             return count;