pass graphDiv to scene constructor

Author: etpinard

src/plots/gl3d/index.js

@@ -51,8 +51,9 @@ exports.plot = function plotGl3d(gd) {
         // If Scene is not instantiated, create one!
         if(scene === undefined) {
             scene = new Scene({
-                container: gd.querySelector('.gl-container'),
                 id: sceneId,
+                graphDiv: gd,
+                container: gd.querySelector('.gl-container'),
                 staticPlot: gd._context.staticPlot,
                 plotGlPixelRatio: gd._context.plotGlPixelRatio
             },

src/plots/gl3d/scene.js

@@ -180,6 +180,8 @@ function Scene(options, fullLayout) {
     var sceneContainer = document.createElement('div');
     var plotContainer = options.container;
 
+    // keep a ref to the graph div to fire hover+click events
+    this.graphDiv = options.graphDiv;
     //Create SVG container for hover text
     var svgContainer = document.createElementNS(
         'http://www.w3.org/2000/svg',