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

Define coherence properties, Define coherence properties?  A coherence ...

Define coherence properties?  A coherence property of a scene is a part of a scene by which relate single part of the scene with the other parts of the scene.

Advantages and deficiencies of gourand shading, Advantages and Deficiencies...

Advantages and Deficiencies of Gourand Shading Advantages of Gourand Shading: this eliminates the intensity discontinuities related with the constant shading model. Defi

Texturing - texture coordinate, Background Texturing is like wallpaperin...

Background Texturing is like wallpapering; you are pasting an image onto the OpenGL Quad primitive.  Recall that GL_QUAD is specified by four vertices.  An image, or a texture,

Distinguish between uniform scaling and differential scaling, Distinguish b...

Distinguish between uniform scaling and differential scaling?  When the scaling factors sx and sy are assigned to the similar value, a uniform scaling is produced that maintain

Assumption for diffuse reflection - polygon rendering, Assumption for Diffu...

Assumption for Diffuse Reflection - Polygon Rendering  i) the diffuse reflections by the surface are scattered along with equal intensity in each direction, independent of vie

Optical character recognition software, Optical Character Recognition Softw...

Optical Character Recognition Software (OCR) Frequently, you will have printed matter and the other text to incorporate in your project although no electronic text file. Along

Scan conversion, State the purpose of scan conversion , along with the side...

State the purpose of scan conversion , along with the side effects

Translation - 2-d and 3-d transformations, Translation - 2-d and 3-d Transf...

Translation - 2-d and 3-d Transformations It is the process of changing the position of an object. Suppose an object point P(x,y)=xI+yJ be moved to P'(x',y') by the specified

Computer arthcther, How many 128 x 8 RAM chips are needed to provide a memo...

How many 128 x 8 RAM chips are needed to provide a memory capacity of 4096 16 bits?

Subdivision of polygon - visible surface detection , Subdivision of polyg...

Subdivision of polygon Test to find out the visibility of a single surface are made through comparing surfaces that as polygons P along regarding a specified screen area A.

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