The ability to quickly render images with very little user input, even in complex scenarios such as volumetric lights or subsurface scattering effects. It's not perfect but it gets me 99% there for my needs without having to spend days writing custom code (or paying someone else). I would like more control over some aspects (e.g., ray tracing options) especially when working on large projects/scenes. Also, sometimes you get an error message saying something along those lines "KRay failed" which can be difficult to figure out what exactly went wrong. If your looking for quick renders then kray will save time!
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