6 modules - PI-VR GmbH

9 MATERIALS REFERENCE9.1.15 PhongMaterialThe PhongMaterial uses the Phong illumination algorithm which is an empirical modelof local illumination. It describes the way a surface reflects light as a combination ofthe diffuse reflection of rough surfaces with the glossy reflection of shiny surfaces. Itis based on the fact that shiny surfaces have small intense glossy highlights, while dullsurfaces have large highlights that fall off more gradually.» Phong Material Settings264» Diffuse Color: Sets the shader’s diffuse reflection color. This is the colour theshader adopts, when light reflections of the surface are spread to many directions.» Glossy Color: Sets the shader’s colour for glossy reflections. Glossy reflectionsresult from irregularities of a surface at a microscopic level. Reflection behavioris described by the law of reflection which states that the direction of incominglight (incident ray) and the direction of outgoing light reflected (reflected ray) formthe same angle with respect to the surface normal, thus the angle of incidence