- Implement screen-door transparency as an alternative to alpha-based transparency. To enable screen-door transparency, pass transparency : 'screendoor' when constructing the viewer.
- Added special selection highlighting render mode.
- Improve handling of click event by only firing click events when the mouse button is pressed/released within a short timespan.
- Improve rendering of outline by properly scaling the extrusion factor based on the size of the GL canvas.
- Added more sample code to documentation