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

Tones and tints, Q. What is the difference between tones and tints? Which o...

Q. What is the difference between tones and tints? Which one component of YIQ color model does black- and- white television use? How can you convert a ZTSC video signal to an RGB s

Objectives-multimedia, Objectives-Multimedia After going through this s...

Objectives-Multimedia After going through this section, you should be capable to: explain hypertext and hypermedia ideas, illustrate how multimedia applications are

Basic ray tracing algorithm - polygon rendering, Basic Ray Tracing Algorith...

Basic Ray Tracing Algorithm - Polygon Rendering The Hidden-surface removal is the most complete and most versatile method for display of objects in a realistic fashion. The co

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

Remote sensing packages-Image processing, Remote Sensing Packages: general...

Remote Sensing Packages: generally utilized software illustration is-" ERDAS" Characteristics: I.Best suitable for satellite imagery system. II. ERDAS uses geo-spatial in

What is 2-dimensional transformation, 2-DIMENSIONAL TRANSFORMATION Mode...

2-DIMENSIONAL TRANSFORMATION Modeling transformation is the mechanism to compose an image from modeling  primitives. The modeling primitives are defined in their own coordinate

Computations with phong shading, Computations with Phong Shading Compu...

Computations with Phong Shading Computations involved along with Phong Shading:  i)   Find out average unit normal vector at each polygon vertex. ii)   Linearly interpol

Vecgen algorithm, Working of vecgen algorithm with diagram

Working of vecgen algorithm with diagram

Scenes - polygon rendering and ray tracing methods, Scenes - polygon render...

Scenes - polygon rendering and ray tracing methods In the context of ray tracing, a scene is a set of objects and light sources which will be viewed through a camera. All of

Low level techniques or motion specific, Low Level Techniques or Motion Spe...

Low Level Techniques or Motion Specific These techniques are utilized to control the motion of any graphic element in any animation scene completely. These techniques are also

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