Lighting an Interior Daytime Scene - Photographic Rendering with V-Ray for SketchUp - page 67

The divider line between the two in the frame buffer window gives us the ability to
slide left and right over the two renders. This means that we can compare various
elements of the two and decide whether or not the changes we have made have
brought about an improvement in the newer render.
In this instance, clearly the final result with both GI and sunlight enabled looks far
more natural than the original Rectangle light-only render. Obviously, we do need to
keep in mind here that we are working with all of our quality settings as per V-Ray's
default settings, and also that we haven't applied any actual surface properties to our
materials as of yet.
Using the GI skylight
Our rectangle light setup is clearly capable of helping us add a daylight feel to our in-
terior; one big drawback besides the required setup time would be the fact that there
are quite obviously a lot of direct lights now required in the scene, all of which need
to draw on processing power in order to create light and shadow effects. This, as you
have probably already experienced, can slow down our renders by quite a significant
amount.