So I am following this tutorial to extend the autodesk forge viewer. I have compelted all of the steps and no button is showing, I assume this is due to an error with the loadin
Yes, you are missing the CSS for the Buttons and also the reference to the JS files pertaining to the extensions in your HTML file.
<script src="your_folder/MyExtensionFileName.js"></script>
http://learnforge.autodesk.io/#/viewer/extensions/selection?id=toolbar-css Check this for the CSS of your extension buttons.