Lumen does very good job for all rough materials but has problems with super reflective ones ( mirrors ).
It would be nice to have ability to put on top of the LUMEN that has troubles with reflections for mirror surfaces ( meshes in reflection are distorted ) some other technology like:
Planar Reflection ( based on priority and placed planar object) or Ray Trace Reflection ( based on roughness trigger ).
Reflection Distortion
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