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

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

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,

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

Explain about the computer-aided design, Explain about the Computer-Aided D...

Explain about the Computer-Aided Design CAD is used in the design and development of new products in a several of applications both at home and on a commercial/industrial basis

web design and editing, Web Design and Editing To edit and make a webs...

Web Design and Editing To edit and make a website, the big three softwares are use: 1)   DreamWeaver (MacroMedia) 2)   Frontpage (MicroSoft) 3)   Go Live (Adobe) 4)

Scan conversion - 2d shape primitives, Scan conversion: For display of...

Scan conversion: For display of a continuously defined object, a method to map a continuous abstract object or shape into a discrete plane of computer display is needed.  This

Matlab, need help in coding

need help in coding

Display devices - graphics hardware, Display Devices - Graphics Hardware ...

Display Devices - Graphics Hardware Since the importance of output and input devices has been discussed over, so let us now focus our discussion particularly on display dev

Progressive scan in image capture formats, Progressive Scan: Progressive o...

Progressive Scan: Progressive or non-interlaced scanning is a process which displays, transmits or stores moving images wherein, the lines of all frame are drawn in order. It is i

Clip a line segment - cyrus beck line clipping algorithm, How does the Cyru...

How does the Cyrus Beck line clipping algorithm, clip a line segment whether the window is non convex? Solution : see the following figure 13, now the window is non-convex in s

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