A couple of months ago Mark Lee presented a good breakdown of our dynamic shadow system for one of our internal Tech Presentations. Shadows are sometimes frustrating, often a pain, and always have more edge-cases than you anticipate. Mark spoke in detail about the tradeoffs we made and why those were best for our situation, and what kinds of improvements we could make. Don’t expect the attached slides to give all the implementation details, but they should give you a nice, if not rough, idea of what we’re doing and why.