One RT light. Square to the figure. I kept the rendersettings low on purpose. Attached the settings. No Raybounces so I set it to 0 to save the calculation time. RayTrace has to be enabled obviously.

I just did this to see how far Poser has come since P5.. You can up the blur and raise bias to smooth out the shadows. Lower shadow to 0.5-0.7...etc in Ray Trace. Mix it with a clone Shadowmap light and split the shadows from 1.00.(example).. Options are endless