diff --git a/docs/graph3d/index.html b/docs/graph3d/index.html
index 16467484..429e2a98 100644
--- a/docs/graph3d/index.html
+++ b/docs/graph3d/index.html
@@ -474,7 +474,8 @@ var options = {
         The contents of the tooltip can be customized by providing a callback
         function as <code>tooltip</code>. In this case the function is called
         with an object containing parameters <code>x</code>,
-        <code>y</code>, and <code>z</code> argument,
+    <code>y</code>, <code>z</code>, and <code>data</code>
+    (the source JS object for the point) as an argument,
         and must return a string which may contain HTML.
       </td>
     </tr>
diff --git a/examples/graph3d/11_tooltips.html b/examples/graph3d/11_tooltips.html
index 508e7e0a..39af19aa 100644
--- a/examples/graph3d/11_tooltips.html
+++ b/examples/graph3d/11_tooltips.html
@@ -24,6 +24,11 @@
 
       // Create and populate a data table.
       data = new vis.DataSet();
+    var extra_content = [
+    'Arbitrary information',
+    'You can access data from the point source object',
+    'Tooltip example content',
+    ];
 
       // create some nice looking data with sin/cos
       var steps = 5;  // number of datapoints will be steps*steps
@@ -34,10 +39,10 @@
           var z = custom(x,y);
           if (withValue) {
             var value = (y - x);
-            data.add({x:x, y:y, z: z, style:value});
+            data.add({x:x, y:y, z: z, style:value, extra: extra_content[(x*y) % extra_content.length]});
           }
           else {
-            data.add({x:x, y:y, z: z});
+      data.add({x:x, y:y, z: z, extra: extra_content[(x*y) % extra_content.length]});
           }
         }
       }
@@ -55,8 +60,9 @@
         // Option tooltip can be true, false, or a function returning a string with HTML contents
         //tooltip: true,
         tooltip: function (point) {
-          // parameter point contains properties x, y, z
-          return 'value: <b>' + point.z + '</b>';
+          // parameter point contains properties x, y, z, and data
+      // data is the original object passed to the point constructor
+      return 'value: <b>' + point.z + '</b><br>' + point.data.extra;
         },
 
         keepAspectRatio: true,
diff --git a/lib/graph3d/Graph3d.js b/lib/graph3d/Graph3d.js
index f2c17507..01fe7445 100644
--- a/lib/graph3d/Graph3d.js
+++ b/lib/graph3d/Graph3d.js
@@ -1,5 +1,4 @@
-var Emitter = require('emitter-component');
-var DataSet = require('../DataSet');
+var Emitter = require('emitter-component'); var DataSet = require('../DataSet');
 var DataView = require('../DataView');
 var util = require('../util');
 var Point3d = require('./Point3d');
@@ -561,6 +560,7 @@ Graph3d.prototype._getDataPoints = function (data) {
       point3d.x = x;
       point3d.y = y;
       point3d.z = z;
+      point3d.data = data[i];
 
       obj = {};
       obj.point = point3d;
@@ -594,6 +594,7 @@ Graph3d.prototype._getDataPoints = function (data) {
       point.x = data[i][this.colX] || 0;
       point.y = data[i][this.colY] || 0;
       point.z = data[i][this.colZ] || 0;
+      point.data = data[i];
 
       if (this.colValue !== undefined) {
         point.value = data[i][this.colValue] || 0;