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

Multimedia tool features, Multimedia Tool Features General to nearly a...

Multimedia Tool Features General to nearly all multimedia tool platforms are various features for encapsulating the content, presenting the data, acquiring user input and cont

Use of interactive multimedia in education, Use of Interactive Multimedia i...

Use of Interactive Multimedia in Education Virtual reality, where 3-D experimental training can simulate real situations. Computer simulations of things too expensive,

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

Operation reseach, #question. Steps involved in the solution of operation r...

#question. Steps involved in the solution of operation research problem

Delta-delta arrangement and in-line arrangement, Delta-Delta Arrangement an...

Delta-Delta Arrangement and In-Line Arrangement There are two types of shadow masks available, delta-delta arrangement and in-line arrangement. The in-line arrangement refers t

Explain the bresenham line generation algorithm, 1. Explain the Bresenham ...

1. Explain the Bresenham line generation algorithm via digitizing the line with end  points as (15, 5) and also (25,13). Ans. Now we are utilizing the Bresenham line generati

Audio file formats, Audio File Formats: It is a container format for ...

Audio File Formats: It is a container format for storing audio data in a computer system. Many file formats are there for storing audio files. The common approach towards

Compare bresenham line generation algorithm with dda, 1. Compare Bresenham...

1. Compare Bresenham line generation with Digital Differential Analyzer line generation. Ans.   Bresenham line generation algorithm is better than Digital Differential Analyze

Explain the lofting method in maya, QUESTION 1: a) Draw a Bezier curve ...

QUESTION 1: a) Draw a Bezier curve showing the following components i. hull ii. curve CV iii. span iv. start and end point b) Maya provides highly effective tools for all t

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