Phong shading algorithm, Computer Graphics

Assignment Help:

Q. Describe briefly phong shading algorithm.  

OR               

Write short note on phong shading.   

Phong shading   Phong shading or normal vector interpolation shading is an accurate method developed by phong Bui Tuong for rendering a polygon surface. It interpolates normal vectors and then apply the illumination model to each surface point. It displays more realistic highlights on a surface and greatly reduces the Match- band effect. A polygon surface is rendered using Phong shading by carrying out the following steps: 1. Determine the average unit normal vector at each polygon vertex. 2. Linearly interpolate the vertex normal over the surface of the polygon. 3. Apply an illumination model along each scan line to calculate project pixel intensities for the surface point. Phong shading method requires considerably more calculations. Surface rending with phong shading can be speed by up using approximations in the illumination model calculations of normal vectors. Fast phong shading approximates the intensity calculations using a Taylor- series expansion and triangular surface patches. Fast phong shading takes approximation twice as long as to render a surface then with Gouraud shading. Normal phong shading using forward difference takes about six to seven times longer then Gouraud shading. 

                                                                                                                                 

 


Related Discussions:- Phong shading algorithm

General perspective transformation, General Perspective transformation w.r....

General Perspective transformation w.r.t. an arbitrary center of projection Suppose here that the COP is at C(a,b,c), as demonstrated in Figure. By Figure, the vectors CP

., Define the working procedure of CRT with diagram

Define the working procedure of CRT with diagram

Construction of a solid with a translational sweep, Construction of a Solid...

Construction of a Solid with a Translational Sweep Figure demonstrates construction of a solid along with a translational sweep. Translating the control points of the periodic

What is persistence and resolution, What is persistence and resolution?  ...

What is persistence and resolution?  The time it takes the emitted light from the screen to decay one tenth of its original intensity is known as a persistence.  The maximum

Line generation algorithms - graphic primitives, Line Generation Algorithms...

Line Generation Algorithms - Graphic Primitives In previous section we have discussed the case of frame buffer, here information regarding the image to be projected upon the

Cases for digital differential analyzer algorithm, Cases for Digital Differ...

Cases for Digital Differential Analyzer Algorithm 1)  If in case 1, we plot the line another way round that is, moving in y direction via 1 unit every time and after that hunt

Define the term avatars- animation, Define the term Avatars- Animation ...

Define the term Avatars- Animation Avatars are another instance of animation. These are frequently used to represent people either in 3-D (as used in computer games) and in 2-D

List five different area of application of computer graphics, Question: Lis...

Question: List five different areas of applications of computer graphics Answer: Five major areas of applications of computer graphics are:  i) Study of molecular structures.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd