What is the purpose of reflectance models?
Reflectance models are analytic functions specifying the ratio of reflected radiance to irradiance at a point.
What is Phong reflection model in computer graphics?
Phong reflection is an empirical model of local illumination. It describes the way a surface reflects light as a combination of the diffuse reflection of rough surfaces with the specular reflection of shiny surfaces.
What is the difference between reflection and reflectance?
As nouns the difference between reflectance and reflection is that reflectance is (physics) the ratio of the flux reflected to that incident on a surface while reflection is the act of reflecting or the state of being reflected.
What does Brdf stand for?
The bidirectional reflectance distribution function (BRDF) is a measure of the amount of light scattered by some medium from one direction into another. Integrating it over specified incident and reflected solid angles defines the reflectance, which can be easily related to the absorptance (or emissivity) of a sample.
What is Cook Torrance?
Cook-Torrance BRDF is a function that can be plugged into the rendering equation as fr. With this BRDF we model the behaviour of light in two different ways making a distinction between diffuse reflection and specular reflection.
What is reflectance measurement?
Reflectance Measurement Reflectance is measured by shining light on a sample and measuring the light reflected from the sample. Specular reflected light is the light reflected from shiny mirror-like surfaces at the same angle as the incident angle.
What is a BSDF file?
You may have heard of BTDF (transmission) and/or BRDF (reflection), well a BSDF is essentially the combination of a BRDF and BTDF. The LBNL format BSDF file contains angularly resolved transmission and reflection data that simulation software can use to determine how to distribute light incident on a surface.
What is Ggx distribution?
The GGX distribution is the distribution of normals of an ellipsoid. of representing a distribution of normals using an ellipsoid shape was invented inde- pendently multiple times. To our knowledge, it was first introduced by Trowbridge and Reitz [1975] in the physics literature.
What is specular and diffuse reflection?
The reflection of light can be roughly categorized into two types of reflection: specular reflection is defined as light reflected from a smooth surface at a definite angle, and diffuse reflection, which is produced by rough surfaces that tend to reflect light in all directions (as illustrated in Figure 1).