I post this one because we do not have any other solution right now for shaders in Kray. More important is fact that, the DP Reflection is quite less risky in renders (almost no problems with compatibility) . I do not share information which can bring "problems" in commercial renders in Kray. I do not share surfaces which can brings something bad for renders.
Of course there (in LW) are a lot shaders...but most of them are buggy, no documentation (so no 100% support in Kray), slow rendering, etc.Simply forget about ANY shaders in Kray.
Only basic simulation by math connections or pre-processing.
Situation will be solved with K3 when new engine will have his own shaders (K3ShaderPlugin) done specially trough K3 Core and of course optimized for speed and quality. There is no other way to simulate "more complex" physically surfaces. Do not try 3-th part LW plugins...waste of time.
Problem with reflection blur - can be solve only through the Core Engine. If is something (for example LW shader) which gives you faster or better effect it is because of some "brute force" effects done by plugin/shader. This will never work correctly and fast.
GI Noise and reflection blur noise comes from Photon Map, Progressive Photon Map or Path Tracing system of photon distribution . To solve problem, K3Core Engine will have vertex connection and merging system: http://www.smallvcm.com/reports/60sec/
All tricks with reducing noise by special engine or reducing hot pixels by special detector are just halfway solutions.
In sum: you need good GI engine and well written shaders