Basic Illumination Models Diffuse Reflection Phong Specular Reflection Model

Basic Illumination Models Diffuse Reflection Phong Specular Reflection When light falls on any shiny or glossy surface most of it is reflected back, such reflection is known as specular reflection. phong model is an empirical model for specular reflection which provides us with the formula for calculation the reflected intensity ispec. In his original specular reflection model, phong set parameter ks to a constant value independent of surface color. this produces specular reflections that are same color as the incident light (usually white), which gives the surface plastic appearance.

6 7 Basic Illumination Models Ambient Diffuse And Specular Reflections • point source (a): all light rays originate at a point and radially diverge. a reasonable approximation for sources whose dimensions are small compared to the object size • parallel source (b): light rays are all parallel. This scattered light is called diffuse reflection. in addition to diffuse reflection, light sources create highlights, or bright spots, called specular reflection. Diffuse reflection 3. specular reflection − model the combination of light reflections from surrounding objects in the scene − no spatial or directional characteristics − background light − account for all the complex ways in which light can reach an object that are not addressed in the other parts of the illumination equation. The document discusses three basic illumination models: 1. ambient light provides a general level of brightness across a scene and has no directional properties.

Phong Reflection Model Wikipedia Diffuse reflection 3. specular reflection − model the combination of light reflections from surrounding objects in the scene − no spatial or directional characteristics − background light − account for all the complex ways in which light can reach an object that are not addressed in the other parts of the illumination equation. The document discusses three basic illumination models: 1. ambient light provides a general level of brightness across a scene and has no directional properties. 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. In phong shading (not to be confused with phong's illumination model), the surface normal is linearly interpolated across polygonal facets, and the illumination model is applied at every point. An object’s material properties determines how much of a given input light intensity is reflected. under the phong model, material properties are captured by reflectivity coefficient vectors k = (kr, kg, kb) for ambient, diffuse and specular. The document discusses concepts related to basic illumination models. it covers key components like ambient light, diffuse illumination, and specular reflection that contribute to how objects are illuminated.