I'm trying to defer the motion blur pass on my renders to compositing, but have found that the existing Velocity Blur COP doesn't work well (it can't deal with the edges of blurred objects). I've thought about writing my own COP to do this but I can't use VEX as it'll only write to one pixel at a time and I don't know enough about C++ to use the HDK to build one.

What does everybody else use for their deferred motion blur pass - do you pipe through a 3rd party package (such as ReelSmart)? I'd prefer to find a solution that works within Houdini. How hard would it be for someone to build a better Velocity Blur COP using HDK? Any thoughts?