Rendering the Effect of Labradorescence

Abstract

Labradorescence is a complex optical phenomenon that can be found in certain minerals, such as Labradorite or Spectrolite. Be- cause of their unique colour properties, these minerals are often used as gemstones and decorative objects. Since the phenomenon is strongly orientation dependent, such minerals need a special cut to make the most of their unique type of colourful sheen, which makes it desirable to be able to predict the final appearance of a given stone prior to the cutting process. Also, the peculiar prop- erties of the effect make a believable reproduction with an ad-hoc shader difficult even for normal, non-predictive rendering purposes. We provide a reflectance model for labradorescence that is di- rectly derived from the physical characteristics of such materials. Due to its inherent accuracy, it can be used for predictive rendering purposes, but also for generic rendering applications.

BibTex Citation

				
					Rendering the Effect of Labradorescence