Graphics Reference
In-Depth Information
Just as with reflection, all transparent materials are not clear. The appearance of fogged glass (or other
transparent materials) can easily be created with Refraction Roughness. Because there is only a single aspect
of transparency (unlike the relationship of reflectivity and specularity), the roughness setting is automatic-
ally enabled when any percentage is set. Care should be taken with the amount here, as high settings will
completely obscure any transparency.
Figure 6-42
shows a setting of 10%. Blurriness also increases with
thickness. Higher settings require additional calculation time as well, because additional refraction rays are
then required to create a smooth appearance.
Figure 6-43
has the rays increased to 128 (from the default of
