From a5bd6b2d558645b0f070a626b6a8566e37749e30 Mon Sep 17 00:00:00 2001
From: liabru <liabru@brm.io>
Date: Wed, 3 May 2017 21:10:14 +0100
Subject: [PATCH] change constraint solve order

---
 src/constraint/Constraint.js | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/constraint/Constraint.js b/src/constraint/Constraint.js
index 68d75ae..61de118 100644
--- a/src/constraint/Constraint.js
+++ b/src/constraint/Constraint.js
@@ -103,9 +103,27 @@ var Common = require('../core/Common');
      * @param {number} timeScale
      */
     Constraint.solveAll = function(constraints, timeScale) {
-        for (var i = 0; i < constraints.length; i++) {
+        // Solve fixed constraints first.
+        for (var i = 0; i < constraints.length; i += 1) {
+            var constraint = constraints[i],
+                fixedA = !constraint.bodyA || (constraint.bodyA && constraint.bodyA.isStatic),
+                fixedB = !constraint.bodyB || (constraint.bodyB && constraint.bodyB.isStatic);
+
+            if (fixedA || fixedB) {
+                Constraint.solve(constraints[i], timeScale);
+            }
+        }
+
+        // Solve free constraints last.
+        for (i = 0; i < constraints.length; i += 1) {
+            constraint = constraints[i];
+            fixedA = !constraint.bodyA || (constraint.bodyA && constraint.bodyA.isStatic);
+            fixedB = !constraint.bodyB || (constraint.bodyB && constraint.bodyB.isStatic);
+
+            if (!fixedA && !fixedB) {
             Constraint.solve(constraints[i], timeScale);
         }
+        }
     };
 
     /**