[sebbo]

maxwell does great results but it's tricky to use maxwell with live-action-plates - so therefor its need to have the ability to renderout
alpha channels on a per object base - to simply define which objects should render their own alphas

and its need to have a shader like mayas "useBackground" - to render only shaows, reflections etc without having influence upon the light-flow

[Micha]

... I think about this problem some days befor and I have an idea for a first aid now: assign black and white emitter materials to the objetcs could help.