Phong model or phong specular reflection model, Computer Graphics

Phong Model or Phong Specular Reflection Model

It is an empirical model that is not based on physics, although physical observation. Phong observed here for extremely shiny surfaces the specular highlight was minute and the intensity fell off quickly, whereas for duller surfaces this was superior and fell off more slowly. He decided to allow the reflected intensity be a function of (cos θ)n with n >= 200 for a shiny surface and n minute for a dull surface. For an ideal reflector n equals infinity, and for a part of cardboard n equals 0 or 1. In the diagram demonstrated below we can observe how the function (cos θ)n behaves for various values of n. This empirical model for computing the specular reflection range was developed via Phong and therefore termed as PHONG MODEL/ PHONG SPECULAR REFLECTION MODEL. That is the intensity of specular reflection is proportional to cosn a (a lies in between 0° & 90°) consequently cos a varies from 1 to 0. Here 'n' is specular reflection parameter dependent upon the type of surface.

Remember that the Phong illumination equation is simply the Lambert illumination equation along with an additional summand to account for ambient reflection and specular reflection.

Posted Date: 4/5/2013 2:48:25 AM | Location : United States

Related Discussions:- Phong model or phong specular reflection model, Assignment Help, Ask Question on Phong model or phong specular reflection model, Get Answer, Expert's Help, Phong model or phong specular reflection model Discussions

Write discussion on Phong model or phong specular reflection model
Your posts are moderated
Related Questions
1. Implement the boundary fill algorithm and flood fill algorithm in C-language and use your code to fill two different types of closed areas such as  i)  A Circle ii)  A sel

Hue and Saturation: A light source produced by a sun or electric bulb emits all frequencies within the visible range to give white light. When this light is incident upon an objec

QUESTION (a) People want to know design patterns. i) What should their attitude be about design patterns? ii) How can people use design patterns to do a better job?

Sound and Audio: Sound is a mechanical energy disturbance which propagates by matter as a wave. Sound is characterized through the various properties that are: frequency, per

Low Level Techniques or Motion Specific These techniques are utilized to control the motion of any graphic element in any animation scene completely. These techniques are also

Question: a) Datagram packet delivery and Virtual circuit packet delivery are two approaches to the delivery of packets by the network layer. Explain. b) What is the meaning

Explain the merits and demerits of Penetration techniques. The merits and demerits of the Penetration techniques are as follows:     It is an inexpensive method.     It h

What is the use of Projection reference point?  In Perspective projection, the object positions are transformed to the view plane with these converged projection line and the p

Specular Reflection - Polygon Rendering & Ray Tracing Methods Specular reflection is while the reflection is stronger in one viewing direction that is a bright spot, termed

Positive Accelerations - Computer Animation So as to incorporate increasing speed in an animation the time spacing among the frames should increase, hence greater change in th