Tip's and tricks
From Kraytracing Wiki
You can find some older Tips and tricks in our Forum.
FG Transparency/Refractions
When you turn off FG Transparency/Refractions you will not receive any FG rays through transparent surfaces. This means that for example your windows will block FG rays and therefore the light will look inacurate.
So when you turn off FG transparency/refractions to speed up render make sure to move your glass to a separate layer object and turn ON "unseen by radiostiy" in the object properties.
