Warnock algorithm
The Warnock algorithm is a hidden surface algorithm invented by John Warnock that is typically used in the field of computer graphics. It solves the problem of rendering a complicated image by recursive subdivision of a scene until areas are obtained that are trivial to compute. In other words, if the scene is simple enough to compute efficiently then it is rendered; otherwise it is divided into smaller parts which are likewise tested for simplicity.
This is a divide and conquer algorithm with run-time of , where n is the number of polygons and p is the number of pixels in the viewport.
The inputs are a list of polygons and a viewport. The best case is that if the list of polygons is simple, then draw the polygons in the viewport. Simple is defined as one polygon (then the polygon or its part is drawn in appropriate part of a viewport) or a viewport that is one pixel in size (then that pixel gets a color of the polygon closest to the observer). The continuous step is to split the viewport into 4 equally sized quadrants and to recursively call the algorithm for each quadrant, with a polygon list modified such that it only contains polygons that are visible in that quadrant.

This is an excerpt from the article Warnock algorithm from the Wikipedia free encyclopedia. A list of authors is available at Wikipedia.
The article Warnock algorithm at en.wikipedia.org was accessed 541 times in the last 30 days. (as of: 10/31/2013)
Images on Warnock algorithm
Preview image:
Original:
Search results from Google and Bing
1
1
1
Warnock algorithm - Wikipedia, the free encyclopedia
The Warnock algorithm is a hidden surface algorithm invented by John Warnock that is typically used in the field of computer graphics. It solves the problem of ...
en.wikipedia.org/wiki/Warnock_algorithm
2
>30
2
Warnock's Algorithm
This fourth type of algorithm is a unique approach to hiding polygons. The approch is this: 1> Take a given section of the screen (the entire screen, in the first ...
www.cs.helsinki.fi/group/goa/render/piilopinnat/warnock.html
3
>30
3
Lecture 36
For real time applications faster algorithms are required which can ... used are not part of the visibility algorithms. ... Eg. Roberts algorithm, Warnock's algorithm.
4
>30
4
Hidden Surface elimination: Area Subdivision or Warnock's Algorithm
Oct 7, 2012 ... 1) Initialize the area. 2) Create list of polygons by sorting them with their z values of vertices. Eliminate disjoint polygons (polygons which are ...
www.moreprocess.com/computer-graphics/hidden-surface-elimination-area-subdivision-or-warnocks-algorithm
5
>30
5
Intro to Computer Graphics: Visible Surface Determination
object space algorithms do their work on the objects themselves before they are converted to .... Warnock's algorithm is a recursive area-subdivision algorithm.
www.cs.uic.edu/~jbell/CourseNotes/ComputerGraphics/VisibleSurfaces.html
6
>30
6
Introduction of Warnock Algoritham |authorSTREAM
Mar 25, 2009 ... INTRODUCTION : INTRODUCTION The Warnock algorithm is a hidden surface algorithm invented by John Warnock that is typically used in the ...
www.authorstream.com/Presentation/aSGuest15412-166980-introduction-warnock-algoritham-computer-graphics-algorithm-prakash-sc70688-education-ppt-powerpoint/
7
>30
7
Warnock's Algorithm - MediaLab
Warnock's Algorithm. A divide and conquer algorithm. Warnock(PolyList PL, ViewPort VP) If ( PL simple in VP) then Draw PL in VP else Split VP vertically and  ...
medialab.di.unipi.it/web/IUM/Waterloo/node68.html
8
>30
8
11.8 Warnock's Algorithm for Computer Graphics BCA 33 - Scribd
Oct 20, 2008 ... algorithm divides the screen into 4 equal parts and tries to apply step (i) ... this, in any window, the algorithm classifies the polygons into three ...
www.scribd.com/doc/7395710/76/Warnock%E2%80%99s-Algorithm
9
>30
9
Hidden Surface Removal
The scan-line algorithm is another image-space algorithm. .... Warnock's algorithm classifies polygons with respect to the current viewing window into trivial or ...
www.cs.sun.ac.za/~lvzijl/courses/rw778/grafika/OpenGLtuts/Big/graphicsnotes009.html
10
>30
10
z
Binary Space-Partitioning Trees. □ The z-Buffer Algorithm. □ Scan-Line Algorithm. □ Visible-Surface Ray Tracing. (Ray Casting). □ Warnock's Algorithm  ...
graphics.csie.ntu.edu.tw/~robin/courses/3dcg08/ppt/3dcg08_05vsd.pdf
Search results for "Warnock algorithm"
Warnock algorithm in science
Warnock algorithm - Wikipedia, the free encyclopedia
The Warnock algorithm is a hidden surface algorithm invented by John Warnock ... University of Utah. The algorithm was Warnock's doctoral thesis. , 32 pages
John Warnock - Wikipedia, the free encyclopedia
At the University of Utah he was a member of the Gamma Beta Chapter of the Beta ... In his 1969 doctoral thesis, Warnock invented the Warnock algorithm for ...
Warnock's Algorithm - MediaLab
Warnock's Algorithm. ... Warnock(PolyList PL, ViewPort VP) If ( PL simple in VP) then Draw PL in VP else Split VP vertically and ... University of Waterloo
Warnock's Algorithm
This fourth type of algorithm is a unique approach to hiding polygons. The approch is this: 1> Take a given section of the screen (the entire screen, in the first ...
[PDF]A Hidden Surface Algorithm for Computer Generated Halftone Pictures
John E. Warnock ... particular It presents . new method for converting data describing three- ... by Computer Science of the University of Utah, Salt Lake.
[PDF]z
Bing-Yu Chen. National Taiwan University. Page 2. Visible-Surface Determination. □ Back-Face Culling. □ The Depth-Sort Algorithm ... Warnock's Algorithm ...
[PDF]A real—time visible surface algorithm
UNIVERSITY OF UTAH. I U NE '1 970 ... This research was supported in part by the University of .... After Warnock's algorithm was developed, Bouknight [7].
The Innovator | Continuum - University of Utah
University of Utah alum and Adobe pioneer John Warnock recollects his path to a ... That 1969 thesis outlined the “Warnock algorithm for hidden surface ...
Books on the term Warnock algorithm
Computer Graphics and Geometric Modelling
Max K. Agoston, 2005
7.6 Warnock and Weiler-Atherton Area Subdivision 273 it was sufficient to choose the best from a few chosen at random (five seemed to work well). We have just described the original BSP algorithms. Variants have been developed since then ...
Masterminds of Programming: Conversations with the Creators of Major Programming Languages (Theory in Practice...
2009
Masterminds of Programming features exclusive interviews with the creators of several historic and highly influential programming languages. In this unique collection, you'll learn about the processes that led to specific design decisions, including the goals they had in mind, the trade-offs they had to make, and how their experiences have lef...
Computer Graphics: A Practical Approach, Concepts, ...
Rajiv Chopra, 2011
Q.19. Q.20. Q.21. Q.22. Explain the following i (a) Painter's algorithm (b) Warnock's algorithm [JNTU, Hyderabad, B.Tech (Mech)— 2"'I sem., April/May 2005] (a) What is the minimax test used in Z-buffer algorithm? When the mini-max test fails?
The History of Visual Magic in Computers: How Beautiful Images are Made in CAD, 3D, VR and AR
2013
From the reviews:“It is dedicated to ‘the thousands of people over thousands of years who have developed the building blocks and made the discoveries in mathematics and science to make such 3D magic possible.’ … The brilliant timing of The History of Visual Magic in Computer … provides a new magical dimension on the time span to the topic, both fas...
Computer Graphics
APURVA A. DESAI, 2008
Warnock introduced this method in the year 1969. This is a very primitive and basic algorithm and it is also a very lengthy algorithm. Also, the process increases with the increased resolution of the scene. This algorithm divides the scene into ...
Computer Graphics, Multimedia and Animation
Pakhira Malay K.
X Figure 12.11: Incremental method for depth calculation. 12.3 Warnock's Algorithm Warnock's algorithm makes use of area coherence. Here, coherent area in the image space is found out by the repeated area subdivision method. Hence, the ...

Blog posts on the term
Warnock algorithm
The Warnock Algorithm or, rather, the Warnock Influence | Corona Labs
John Warnock (co-founder of Adobe) is not just known for being the mind behind Adobe, PostScript, and Acrobat. Prior to Adobe, he worked for Xerox PARC and was one of the foremost scientists in leading the effort for JaM (“J” being John; “M” being Martin Newell, famous for the Utah Teapot), the precursor to PostScript.
coronalabs.com/blog/2011/03/18/the-warnock-algorithm-or-rather-the-warnock-influence/
Blog by Adrian Warnock and Home of the Warnies
Introduction of Warnock Algoritham |authorSTREAM
Introduction of Warnock Algoritham - authorSTREAM Presentation
www.authorstream.com/Presentation/aSGuest15412-166980-introduction-warnock-algoritham-computer-graphics-algorithm-prakash-sc70688-education-ppt-powerpoint/
11.8 Warnock’s Algorithm for Computer Graphics BCA 33