Gourand shading, Computer Graphics

Assignment Help:

This renders a polygon surface by linearly interpolating intensity values across the surface. Intensity values for each polygon are matched with the values of adjacent polygon along the common edges, thus eliminating the intensity discontinuities that can occur in flat shading. Each polygon surface is rendered with Gourand shading by performing the following calculation:  (i) Determine the average unit normal vector at each polygon vertex. (ii) Apply an illumination model to each vertex to calculate the vertex intensity. (iii) Linearly interpolate the vertex intensities over the surface of the polygon. At each polygon vertex we obtain a normal vector by averaging the surface normal of all polygons sharing that vertex. Thus for vertex position V, we obtain the unit vertex normal width the calculation. One we have the vertex normal's, we determine the intensity at the vertices from a lightning model. Incremental calculations are used to obtain successive edge intensity values between scan lines and to obtain successive intensities along a scan line. 

 

 


Related Discussions:- Gourand shading

What is the use of control points, What is the use of control points?  ...

What is the use of control points?  Spline curve can be specified by giving a set of coordinate positions known as control points, which shows the general shape of the curve, c

Determine the transformation matrix for cavalier projection, Determine the ...

Determine the transformation matrix for: a) Cavalier projection with θ=45 0 , and b) Cabinet projection with θ=30 0    c) Draw the projection of unit cube for all transfor

Interactive 3d computer graphics, Describe interactive model of computer gr...

Describe interactive model of computer graphics and application areas of interactive computer graphics.

Image capture formats, Image Capture Formats: Video cameras appear in...

Image Capture Formats: Video cameras appear in two various image capture formats: progressive and interlaced scan. Interlaced Scan It is a technique of enhancing the

Stochastic animation - computer animation, Stochastic Animation - Computer ...

Stochastic Animation - Computer Animation This utilizes stochastic processes that are a stochastic process can be identified as a random function. Such randomness could be in

Is cad only helpful for design drawings, Question: Is CAD only helpful for ...

Question: Is CAD only helpful for design drawings? No. When true-scale, structurally valid drawings are the purpose for CAD's existence; it utilizes is as diverse as imagination

Cad-cam systems management, Assignment Task Your task is to review and...

Assignment Task Your task is to review and compare the current cad/cam software systems available with the intention to make a recommendation in the form of a written report f

Other file formats and bmp-dib-rle file formats, Other File Formats BM...

Other File Formats BMP/DIB/RLE File Formats These are termed as device independent bitmap files. They exist in two various type formats: a) OS2 format and b) Windows

Shading , short note on shading

short note on shading

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