Questions about YafaRay Render

Hi blenderheads! I start using YafaRay in my projects. But still confusing in some options. So this my questions:1. What does meant the Ray dept in Photon mapping lighting method? The default value is 4. Am I need more value to redusing quality?2. I created the test scene and tried to render, but I get some error: Too few diffuse photons. Diffuse photons is 0. What do I must to do?3. Too few tutorials in YouTube on the render. Of course, I found some tuts by Rio and others, but there are a few info about all options and settings. So, can somebody making the videotutorial on explanation of YafaRay settings and option or some guide?4. Are you know any free renderfarms which is support YafaRay?Regardless.

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Hi recently we have posted a tutorial covering all aspects of photon mapping here:

http://www.yafaray.org/documentation/userguide
http://www.yafaray.org/documentation/tutorials
http://www.yafaray.org/community/forum/viewtopic.php?f=14&t=4966&sid=3edf5d058c9abb22ad651ffca5c642d6