Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
Can you emulate lines with thin cylinders for your purposes? But I do agree, "free drawing" in 3d space would be a fun addition, if possible.
could use the showobjectbounds can be a bit messy though