[PaulZ]

Is creating a non-grainy image just a matter of processing time, or are there other factors that I can adjust to get a non-grainy image?

[juan]

hello Paul,

There are a lot of things you can do to increase speed and get non-grainy images: simplify geometry of emitters, use dielectrics only if necessary... I encourage to to take a look to the general section of this forum.
Regards,

Juan