** Dynamic hair Implemented in a in inefficient, geometry only, and therefore limited way, also incompatible with most other apps. ** Dynamic cloth As with the shader trees, a third party technology, which unless cash-strapped CL found the initial finance to buy up front, rather than paying a fee per unit shipped, will be another up-front cost in any further releases. That is, unless it becomes prohibitivly expensive or un-licenceable, hence requiring a full rewrite with a loss of backwards compatibility. ** A full on ray tracing renderer That must be an Easter Egg. ;-) I've been limited to Firefly which was an attempt to implement a fast scan-line rendering technology with limited hybrid raytracing. Bill