mental ray stories -Final Gathering- 15
With FG rays still at 200, the light angle is 5 degrees, with 10 shadow rays.
The result is still not good enough.
The manual says you can reduce the light-angle to reduce graininess, but I still want to puch up the number of shadow rays.
Maximum shadow rays are 40 !
Next, I'll go for 20 shadow rays in my directional light.