diff --git a/source/viewer/viewer.js b/source/viewer/viewer.js
index c22d481..9852fe2 100644
--- a/source/viewer/viewer.js
+++ b/source/viewer/viewer.js
@@ -156,7 +156,8 @@ OV.Viewer = class
 
         let parameters = {
             canvas : this.canvas,
-            antialias : true
+            antialias : true,
+            precision : 'mediump' // https://github.com/kovacsv/Online3DViewer/issues/69
         };
         
         this.renderer = new THREE.WebGLRenderer (parameters);