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.

Posted Date: 4/5/2013 1:43:22 AM | Location : United States

Ask an Expert

Related Discussions:- Buffer areas required for z-buffer algorithm, Assignment Help, Ask Question on Buffer areas required for z-buffer algorithm, Get Answer, Expert's Help, Buffer areas required for z-buffer algorithm Discussions

Write discussion on Buffer areas required for z-buffer algorithm
Your posts are moderated

Write your message here..

Related Questions

What are the steps to mapping artwork to an object, Question 1: (a) How... Question 1: (a) How can you select and manipulate individual objects in a group? (b) How do you resize an object? Explain how you determine the point from which the object r

3-d transformation, translation translation

What is orthographic oblique projection, What is orthographic oblique proje... What is orthographic oblique projection?  When the direction of the projection is not normal (not perpendicular) to the view plane then the projection is called as oblique proj

Subdivision algorithm - visible surface detection, Subdivision Algorithm - ... Subdivision Algorithm - Visible Surface Detection 1) Initialize the area to be the whole screen. 2) Create a PVPL regarding an area, sorted on z min as the smallest z coor

What are the different ways of specifying spline curve, What are the differ... What are the different ways of specifying spline curve?  Using a set of boundary conditions that are imposed on the spline. Using the state matrix that characteristics

Briefly explain how the median filter works, QUESTION 1 (a) Write a run... QUESTION 1 (a) Write a run method in Image J environment for the following cases Contrast and Brightness Histogram Generation Histogram Equalisation   (b)

Composite transformations - 2-d and 3-d transformations, Composite Transfor... Composite Transformations - 2-d and 3-d Transformations We can build complicated transformations as rotation regarding to an arbitrary point, mirror reflection about a line, a

Seed fill algorithm - output primitives, Seed fill algorithm A seed fil... Seed fill algorithm A seed fill algorithm starts with a known initial interior point of the polygon and spreads out to determine other interior points to fill the given closed

Voltage or electro-magnetic field tablet and pointer, (a)  Voltage or Elect... (a)  Voltage or Electro-Magnetic Field Tablet and Pointer: This has a grid of wires, embedded in the tablet surface along with various voltages or magnetic fields consequent to va

How we create virtual reality images for use on a computers, How we create ... How we create virtual reality images for use on a computer system When a virtual tour of, for instance, a house is shown on a website the images need to be first created and th