8

92 Chapter 17: Rendering
Refractive caustics rendered with the default of Radius
turned off.
Radius size is based on scene extents; specifically, 1/100 the
radius of the full scene.
Radius value explicitly set to 1.0
Radius value increased to 2.5.
Filter type changed to Cone.
Photon count increased to 50,000 (in Global Light Properties
group) for greater detail in the caustics.
Globa l I ll umi nati on wi th the
menta l r ay R en der er
Global illumination enhances the realism of a
scene by simulating radiosity, or the interreflection
of light (other than
caustics (page 3–91) )ina
scene. It generates such effects as "color bleeding,"
where for example, a white shirt next to a red wall
will appear to have a slight red tint.
Scene rendered without global illumination