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

Functioning of hardcopy devices and output primitives, Functioning of hardc...

Functioning of hardcopy devices and Output primitives 1.  Functioning of hardcopy devices-laser printers and dot matrix printers, plotters.  2.  Output primitives: Graphics

Bitmap graphics, Bitmap Graphics: The information below illustrates bitmap...

Bitmap Graphics: The information below illustrates bitmap data. Bitmap images are a set of bits that form an image. The image comprises a matrix of individual dots or pixels wh

Disadvantage of the raster scan display device, Disadvantage of the Raster ...

Disadvantage of the Raster Scan Display Device The major disadvantage of the raster scan is the jagged nature of the lines, happening from the information that the pixels are

What are the advantages of laser printer, What are the advantages of laser ...

What are the advantages of laser printer  High speed, precision and economy. Quality printers. .Cheap to handle Lasts for longer time.

Ray casting - polygon rendering and ray tracing methods, Ray Casting -polyg...

Ray Casting -polygon rendering and ray tracing methods It is a method wherein the surfaces of objects visible to the camera are determined by throwing or say casting rays of

What are the advantages of rendering by patch splitting, What are the advan...

What are the advantages of rendering by patch splitting?  i. It is fast-especially on workstations with a hardware polygon-rendering pipeline.  ii. Its speed can be varied b

What is riged body transformation matrix, What is riged body transformation...

What is riged body transformation matrix? Show that the composition lf two rotation is additive by concatenating the matrix representation of r (theta 2 ) = R (theta1 + theta 2 ) t

Transformation for 3-d scaling, Transformation for 3-D Scaling As we a...

Transformation for 3-D Scaling As we already seen that the scaling process is mainly utilized to change the size of an object. The scale factors find out whether the scaling i

Cohen sutherland line clippings algorithm, Cohen Sutherland Line Clippings ...

Cohen Sutherland Line Clippings Algorithm The clipping problem is identified by dividing the region surrounding the window area into four segments Up as U, Down as D, Left as

Passive computer animations - types of computer animation, Passive Computer...

Passive Computer Animations: That has no option for users to utilize computer graphics today is mostly interactive for example: movies. Frame animation is non-interactive anim

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