Buffer areas required for z-buffer algorithm, Computer Graphics

Assignment Help:

Buffer Areas Required For Z-Buffer Algorithm

For applying z-buffer algorithm, we need two buffer areas or two 2-Dimentional arrays:

1) Depth-buffer [i,j], to save the depth-value of the visible surface for all pixel in the view plane, and

2) Refresh-buffer [i,j], to save the pixel intensities of the visible surfaces.

A. In contrast to z/depth-buffer method, Scan-line method deals along with numerous surfaces. Since it processes each scan-line at one time, all polygons intersected through such scan-line are examined to find out that surfaces are visible. The visibility test engages the comparison of depths of each overlapping surfaces to find out one is nearer to the view plane. If it is determines so, then it is declared like a visible surface and the intensity values at the positions beside the scan-line are entered in the refresh-buffer.

B. Area-subdivision method is fundamentally an image-space method but utilizes object- space computations for reordering of surfaces as per to depth. The method makes utilization of area coherence in a scene by collecting those areas which form part of a particular surface. In this method, we successively subdivide the whole viewing area in small rectangles till each small area is the projection of part of a particular visible surface or no surface in any way.


Related Discussions:- Buffer areas required for z-buffer algorithm

Sub classes of orthographic projection, Sub Classes of Orthographic Project...

Sub Classes of Orthographic Projection There are three ordinary sub-classes of Orthographic (axonometric) projections as: 1) Isometric: The direction of projection makes

Bezier curves - modeling and rendering, Bezier Curves - Modeling and Render...

Bezier Curves - Modeling and Rendering Bezier curves are utilized in computer graphics to turn out curves which display reasonably smooth at all scales. Such spline approximat

Application in image capture formats, Application Interlacing is utiliz...

Application Interlacing is utilized through all the analogue TV broadcast systems in recent use as: NTSC: 59.94 fields per second, 525 lines, still field drawn first

What do you understood by the term graphic primitives, 1. What do you unde...

1. What do you understood by the term graphic primitives? Ans. Graphic primitives are the basic graphic objects that can be united in any number and method to produce a new i

Homogeneous coordinate systems - 2-d and 3-d transformations, Homogeneous C...

Homogeneous Coordinate Systems - 2-d and 3-d transformations Suppose P(x,y) be any point in 2-D Euclidean (Cartesian) system. In HC System, we add a third coordinate to a poin

What is raster scan display, What is  Raster Scan Display A raster sca...

What is  Raster Scan Display A raster scan display device using CRT on the other hand directs the electron beam across the screen, one row at a time from top to bottom. In a ra

Parallel projection - viewing transformation, Parallel Projection - viewing...

Parallel Projection - viewing transformation Parallel projection methods are utilized by engineers to make working drawings of an object that preserves its true shape. In t

High level techniques (motion generalized), High level techniques (motion g...

High level techniques (motion generalized) Techniques utilized to explain general motion behavior of any of graphic object, such techniques are algorithms or models utilized to

Polygonal meshes - clipping and 3d primitives, Polygonal Meshes - Clipping ...

Polygonal Meshes - Clipping and 3D Primitives Apart from polygonal surfaces, polygonal meshes are also used extensively in 3D geometric modelling.A mesh is essentially a polyg

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