Added Mat4.makeRotationAxis.

Author: photonstorm

v3/src/math/Matrix4.js

@@ -400,6 +400,30 @@ var Matrix4 = new Class({
         return this;
     },
 
+    //  Axis = vec3, angle = radians
+    makeRotationAxis: function (axis, angle)
+    {
+        // Based on http://www.gamedev.net/reference/articles/article1199.asp
+
+        var c = Math.cos(angle);
+        var s = Math.sin(angle);
+        var t = 1 - c;
+        var x = axis.x;
+        var y = axis.y;
+        var z = axis.z;
+        var tx = t * x;
+        var ty = t * y;
+
+        this.set(
+            tx * x + c, tx * y - s * z, tx * z + s * y, 0,
+            tx * y + s * z, ty * y + c, ty * z - s * x, 0,
+            tx * z - s * y, ty * z + s * x, t * z * z + c, 0,
+            0, 0, 0, 1
+        );
+
+        return this;
+    },
+
     rotate: function (rad, axis)
     {
         var a = this.val;