1 files changed, 5 insertions, 1 deletions

diff --git a/js/lib/geom/rectangle.js b/js/lib/geom/rectangle.js
index f41c27f6..d4dd8033 100755
--- a/js/lib/geom/rectangle.js
+++ b/js/lib/geom/rectangle.js
@@ -12,7 +12,11 @@ var MaterialsModel = require("js/models/materials-model").MaterialsModel;
 //      GL representation of a rectangle.
 //      Derived from class GeomObj
 ///////////////////////////////////////////////////////////////////////
-var Rectangle = function GLRectangle() {
+var Rectangle = function GLRectangle()
+{
+        if (!MaterialsModel)
+                MaterialsModel = require("js/models/materials-model").MaterialsModel;
+
         // CONSTANTS
         this.N_TRIANGLES = 15;