Iray crashing

rov

Just something I wanted to share.
So far all my renders rendered fine. No problem so far. I used HDRI, used HDRI in combination with a spotlight, used IBL, IBL with spotlight and even IBL with a little headlamp for fill
That was untill yesterday trying to render a simple scene with V4, a reflective floor and a wall in the back. Due to nudity I can't show it her.
I used a 3 point photometric preset I found on the net. It lit the scene the way I wanted it and frankly didn't pay attention to the position of all three lights. DAZ stalled and crashed after about 17 iterations. After that followed a lot of trial and error. First of all I found out that two of the three lights were of no influence to the scene lighting. Eitther behind or under objects. When rendering with the one remaining light it went fine.
Just to see if the amount of lights were of influence on the render I added some. No problem, although I haven't tried very large amounts.

My computer is running on CPU only.
At this moment I'm guessing that the positioning of the lights is of influence to DAZ crashing. In a way it makes sense. If you have a spotlight aimed at a wall with nothing around, it will bounce back in infinity, with DAZ still calculating. So carefull placement of light is a thing.