diff --git a/package.json b/package.json
index 2b52cfa..26c1c65 100755
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vts-browser-js",
-  "version": "2.23.10",
+  "version": "2.23.11",
   "description": "JavaScript WebGL 3D maps rendering engine",
   "main": "src/browser/index.js",
   "scripts": {
diff --git a/src/core/core.js b/src/core/core.js
index 3abb6c1..64c1fdc 100755
--- a/src/core/core.js
+++ b/src/core/core.js
@@ -588,7 +588,7 @@ string getCoreVersion()
 */
 
 function getCoreVersion(full) {
-    return (full ? 'Core: ' : '') + '2.23.10';
+    return (full ? 'Core: ' : '') + '2.23.11';
 }
 
 
diff --git a/src/core/map/metanode.js b/src/core/map/metanode.js
index 9cbae99..bc306b2 100755
--- a/src/core/map/metanode.js
+++ b/src/core/map/metanode.js
@@ -596,6 +596,14 @@ MapMetanode.prototype.generateCullingHelpers = function(virtual) {
             maxDelta = Math.min(d1, d2, d3, d4);
         }
 
+        if (version >= 5 && this.usedDisplaySize()) {
+            this.bboxMaxSize = Math.max(
+                vec3.distance2(bbox, 0, bbox, 3),
+                vec3.distance2(bbox, 3, bbox, 6),
+                vec3.distance2(bbox, 0, bbox, 12)
+            );
+        }
+
         //get cos angle based at 90deg
         this.diskAngle = Math.cos(Math.max(0,(Math.PI * 0.5) - Math.acos(maxDelta)));
         this.diskAngle2 = maxDelta;
diff --git a/src/core/map/surface-tile.js b/src/core/map/surface-tile.js
index 371a06c..b428a9b 100755
--- a/src/core/map/surface-tile.js
+++ b/src/core/map/surface-tile.js
@@ -918,7 +918,7 @@ MapSurfaceTile.prototype.updateTexelSize = function() {
         if (node.usedTexelSize()) {
             screenPixelSize = draw.ndcToScreenPixel * node.pixelSize;
         } else if (node.usedDisplaySize()) {
-            screenPixelSize = draw.ndcToScreenPixel * (node.bbox.maxSize / node.displaySize);
+            screenPixelSize = draw.ndcToScreenPixel * ((node.bbox ? node.bbox.maxSize : node.bboxMaxSize) / node.displaySize);
         }
 
         if (camera.camera.ortho) {
@@ -929,10 +929,9 @@ MapSurfaceTile.prototype.updateTexelSize = function() {
             if (node.usedDisplaySize()) { 
                
                 if (!preciseDistance) {
-                    screenPixelSize = draw.ndcToScreenPixel * (node.bbox.maxSize / 256);
+                    screenPixelSize = draw.ndcToScreenPixel * ((node.bbox ? node.bbox.maxSize : node.bboxMaxSize) / 256);
 
                     factor = (node.displaySize / 256) * camera.distance;
-                    //var factor = (256 / 256) * this.map.cameraDistance;
                     
                     v = camera.vector; //move camera away hack
                     p = [cameraPos[0] - v[0] * factor, cameraPos[1] - v[1] * factor, cameraPos[2] - v[2] * factor];
@@ -940,11 +939,9 @@ MapSurfaceTile.prototype.updateTexelSize = function() {
                     pixelSize = this.getPixelSize(node.bbox, screenPixelSize, p, p, true);
                 } else {
                     if (draw.isGeocent) {
-                        //screenPixelSize = draw.ndcToScreenPixel * ((node.diskAngle2A * draw.planetRadius * 2 * 0.70710678118) / 256) * (256 / node.displaySize);
                         screenPixelSize = draw.ndcToScreenPixel * ((node.diskAngle2A * draw.planetRadius * 1.41421356236) / node.displaySize);
                     } else {
-                        //screenPixelSize = draw.ndcToScreenPixel * (node.bbox.maxSize / 256) * (256 / node.displaySize);
-                        screenPixelSize = draw.ndcToScreenPixel * (node.bbox.maxSize / node.displaySize);
+                        screenPixelSize = draw.ndcToScreenPixel * ((node.bbox ? node.bbox.maxSize : node.bboxMaxSize) / node.displaySize);
                     }
 
                     pixelSize = this.getPixelSize3(node, screenPixelSize);
diff --git a/src/core/utils/matrix.js b/src/core/utils/matrix.js
index 48c5c11..5d73f64 100755
--- a/src/core/utils/matrix.js
+++ b/src/core/utils/matrix.js
@@ -265,6 +265,14 @@ vec3.distance = function (a, b) {
     return Math.sqrt(dx*dx + dy*dy + dz*dz);
 };
 
+vec3.distance2 = function (a, i, b, j) {
+    var dx = b[j] - a[i];
+    var dy = b[j+1] - a[i+1];
+    var dz = b[j+2] - a[i+2];
+    return Math.sqrt(dx*dx + dy*dy + dz*dz);
+};
+
+
 vec3.squareDistance = function (a, b) {
     var dx = b[0] - a[0];
     var dy = b[1] - a[1];