diff --git a/src/component/common/Geo3DBuilder.js b/src/component/common/Geo3DBuilder.js
index ef402414..3879d2ca 100644
--- a/src/component/common/Geo3DBuilder.js
+++ b/src/component/common/Geo3DBuilder.js
@@ -319,6 +319,7 @@ Geo3DBuilder.prototype = {
 
         polygonMesh.on('mousemove', this._onmousemove, this);
         polygonMesh.on('mouseout', this._onmouseout, this);
+        polygonMesh.on('mousedown', this._onmousedown, this);
     },
 
     _updateDebugWireframe: function (componentModel) {
@@ -342,6 +343,15 @@ Geo3DBuilder.prototype = {
         }
     },
 
+    _onmousedown: function (e) {
+        var dataIndex = this._dataIndexOfVertex[e.triangle[0]];
+        if (dataIndex == null) {
+            dataIndex = -1;
+        }
+        this._lastHoverDataIndex = dataIndex;
+        this._polygonMesh.dataIndex = dataIndex;
+    },
+
     _onmousemove: function (e) {
         var dataIndex = this._dataIndexOfVertex[e.triangle[0]];
         if (dataIndex == null) {