diff --git a/HISTORY.md b/HISTORY.md
index 5cabd697..631c66a3 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -4,6 +4,9 @@ http://visjs.org
 
 ## not yet released, version 4.13.1-SNAPSHOT
 
+### Graph3d
+
+- Fixed #1615: implemented new option `dotSizeRatio`.
 
 
 ## 2016-02-01, version 4.13.0
diff --git a/docs/graph3d/index.html b/docs/graph3d/index.html
index 43a5e2c8..c0e604a7 100644
--- a/docs/graph3d/index.html
+++ b/docs/graph3d/index.html
@@ -379,6 +379,13 @@ var options = {
       <td>The line width of dots, bars and lines. Applicable for all styles.</td>
     </tr>
 
+    <tr>
+      <td>dotSizeRatio</td>
+      <td>number</td>
+      <td>0.02</td>
+      <td>Ratio of the size of the dots with respect to the width of the graph.</td>
+    </tr>
+
     <tr>
       <td>gridColor</td>
       <td>string</td>
diff --git a/lib/graph3d/Graph3d.js b/lib/graph3d/Graph3d.js
index 20c7b6b1..68390079 100644
--- a/lib/graph3d/Graph3d.js
+++ b/lib/graph3d/Graph3d.js
@@ -96,6 +96,8 @@ function Graph3d(container, data, options) {
     strokeWidth: 1  // px
   };
 
+  this.dotSizeRatio = 0.02; // size of the dots as a fraction of the graph width
+
   // create a frame and canvas
   this.create();
 
@@ -844,6 +846,8 @@ Graph3d.prototype.setOptions = function (options) {
     if (options.yValueLabel !== undefined)      this.yValueLabel = options.yValueLabel;
     if (options.zValueLabel !== undefined)      this.zValueLabel = options.zValueLabel;
 
+    if (options.dotSizeRatio !== undefined)     this.dotSizeRatio = options.dotSizeRatio;
+
     if (options.style !== undefined) {
       var styleNumber = this._getStyleNumber(options.style);
       if (styleNumber !== -1) {
@@ -976,7 +980,7 @@ Graph3d.prototype._redrawLegend = function() {
   if (this.style === Graph3d.STYLE.DOTCOLOR ||
     this.style === Graph3d.STYLE.DOTSIZE) {
 
-    var dotSize = this.frame.clientWidth * 0.02;
+    var dotSize = this.frame.clientWidth * this.dotSizeRatio;
 
     var widthMin, widthMax;
     if (this.style === Graph3d.STYLE.DOTSIZE) {
@@ -1613,7 +1617,7 @@ Graph3d.prototype._redrawDataDot = function() {
   this.dataPoints.sort(sortDepth);
 
   // draw the datapoints as colored circles
-  var dotSize = this.frame.clientWidth * 0.02;  // px
+  var dotSize = this.frame.clientWidth * this.dotSizeRatio;  // px
   for (i = 0; i < this.dataPoints.length; i++) {
     var point = this.dataPoints[i];