Introduction of visible surface detection, Computer Graphics

Assignment Help:

Introduction of Visible Surface Detection

  • For displaying a realistic presentation of the given 3Dimentional object, hidden surfaces and hidden lines should be identified for remove.
  • The process of considering and eliminating of these hidden surfaces is termed as the visible-line/surface determination or it may be hidden-line/surface elimination.
  • To build a realistic view of the specified 3Dimentional object, it is essential to find out that lines or surfaces of the objects are visible. For this, we necessitate to conduct visibility tests.
  • Visibility tests are organized to find out the surface that is visible from a specified viewpoint.
  • There are two basic approaches for visible-surface determination, as per to whether they deal along with their projected images or along with object descriptions directly. These two approaches are termed as image-space approach and object-space approach, correspondingly.
  • Object space methods are applied in the physical coordinate system wherein objects are explained whereas image space methods are applied in screen coordinate system wherein the objects are viewed.
  • Image-space approach needs examining all the objects in the scene to find out such is closest to the viewer beside the projector passing by the pixel. The visibility is selected point by point at each pixel position upon the projection plane. If various objects are 'n' and the pixels is 'p' after that effort is proportional to n.p.
  • Object-space approach compares each object directly along with each other inside the scene definition and eliminates those objects or portion of objects such are not visible.
  • Object-space approach compares all of the n objects to itself and to another object, discarding invisible portions. Hence the computational effort is proportional to n2.
  • According to this category of Image space approach, we have two methods as:

 

A) Z-buffer method and

B) Scan-line method.

  • In between all the algorithms for visible surface determination, the Z-buffer is maybe the easiest, and is the most extensively used method.
  • Z-buffer method finds the visible surfaces through comparing surface depths as z-values at all pixel positions on the projection plane.

Related Discussions:- Introduction of visible surface detection

File format-introduction to computer graphics, File format We want an i...

File format We want an image of a Fly. The wings are incompletely transparent and to present that in our presentation what be problematic if suitable file format is not there.

Advertising-applications for computer animation, Advertising: One of the m...

Advertising: One of the most well known uses for computer animation is in television advertising. Many of the models which the commercials would call for would be extremely compli

Project by matlab , I am trying to do a project by matlab. which is related...

I am trying to do a project by matlab. which is related to computer vision. the name of project is (texture synthesis and image quilting), which is inspire from this paper (Efros a

Categories of line segments - 2d clipping algorithms, Categories of Line Se...

Categories of Line Segments It categorizes line segments into three categories (i) trivially rejected (ii) trivially selected (iii) may be partially visible or totally invisibl

Method to draw an object by using four bézier curves, Suggest a method to d...

Suggest a method to draw an object as in figure using four Bézier curves of suitable degree Answer: Employ four quartic Bézier curves with the endpoint of one as the initial poi

Animation tools, Animation Tools: Hardware tools: PCs ,Macintosh, ...

Animation Tools: Hardware tools: PCs ,Macintosh, Amiga Software tools: -          Softimage ( Microsoft) ; -          Alias/ Wavefront ( SGI) -          3D s

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

What is a video transition, QUESTION 1. Describe two methods for conver...

QUESTION 1. Describe two methods for converting 16x9 widescreen movie to 4x3. 2. Explain clearly the difference between File Format and Codec. 3. What is a video transiti

Data set, In this project, the image data set consists of 320 training imag...

In this project, the image data set consists of 320 training images and 285 test images. Table 1 shows the image data set in details. In addition to the original images, th

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