A simple tool that will allow us to draw boxes and spheres. Please use the Draw Tool in only full screen mode.
Load the extension and enter fullscreen. And here's how the drawing works:
. on mouse button down event the tool will start "drawing" the geometry in the XY plane
. on mouse button up event, the tool will start monitoring mouse move events to control the height of the geometry
. on mouse click event, the geometry will be finalized
Include the CSS & JS file on your page. This CDN is compatible with the lastest Viewer version (v7).
<link rel="stylesheet" href="http://cdn.jsdelivr.net/gh/autodesk-forge/forge-extensions/public/extensions/DrawToolExtension/contents/main.css">
<script src="http://cdn.jsdelivr.net/gh/autodesk-forge/forge-extensions/public/extensions/DrawToolExtension/contents/main.js"></script>Detailed technical explaination can be found in this blog post.