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Topic: Hidden face removal

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Ray tracing

Computer graphics

Raster graphics

Gouraud shading

Graphical output device

Henri Gouraud

	Hidden surface determination - Wikipedia, the free encyclopedia
		In 3D computer graphics, hidden surface determination is the process used to determine which surfaces and parts of surfaces are not visible from a certain viewpoint.
		Hidden surface determination is necessary to render an image correctly, as parts of the image that are not visible should not be drawn.
		Though hidden surface determination is most often used to determine what is visible in the final image, it is also has other applications, such as determining which parts of objects are in shadow.
	en.wikipedia.org /wiki/Hidden_face_removal (492 words)

	Nitrate Removal (Site not responding. Last check: 2007-10-18)
		The most well-known of these Indian removal s was the Trail of Tears, which resulted in th 7: ==Removal of the "Five Civilized Tribes"== 15: abbit Creek with the Choctaw was the first such removal treaty implemented; others, like the dubious Tr 17: (rather than tribal domains) were not subject to removal.
		Penis removal 1: val of the testicles) sometimes also involves the removal of all or part of the penis, generally with a tub 3: n penis is rare, and references to castration and removal of the penis are almost always symbolic.
		Hidden line removal 1: '''Hidden line removal ''' is an extension of wireframe rendering whe 3: This is not the same as hidden face removal since thi...
	www.elusiveeye.com /side32575-nitrate-removal.html (531 words)

	Face (Site not responding. Last check: 2007-10-18)
		Half of it is hidden in the hair, in the temple and behind the ear, and one quarter of it is hidden behind the auricle.
		The surgical scar is hidden in the crease that we all have in the upper eyelid, and part of it in one of the crow's feet, laterally.
		Some of the limiting factors in rhinoplasty are the contour and shape of the face, the texture and thickness of the skin, and the inclination of the chin, lip and forehead, the depth of the angle between the forehead and the nose, the height of the individual and the healing powers of his tissues.
	www.bio-cellular-research.com /face.html (7904 words)

	Hidden line removal - Wikipedia, the free encyclopedia
		Hidden line removal is an extension of wireframe rendering where lines (or segments of lines) covered by surfaces are not drawn.
		This is not the same as hidden face removal since this involves depth and occlusion while the other involves normals.
		A commonly used algorithm to implement it is Arthur Appel's algorithm (developed at IBM in the late 1960's).
	en.wikipedia.org /wiki/Hidden_line_removal (162 words)

	Computer graphics - Wikipedia, the free encyclopedia
		Polygon surfaces (the sequence of faces) can contain data corresponding to not only a color, but in more advanced software, can be a virtual canvas for a picture, or other rasterized image.
		Such an image is placed onto a face, or series of faces and is called a Texture.
		Textures add a new degree of customization as to how a faces and polygons will ultimately look after being shaded, depending on the shading method, and how the image is interpreted during shading.
	en.wikipedia.org /wiki/Computer_graphics (972 words)

	Hidden face removal (Site not responding. Last check: 2007-10-18)
		It is alsoimplemented to save time, because if a face cannot be seen, that means it should not be drawn in the scene, and therefore youdon't have to waste CPU cycles drawing it.
		The normal is a vector which is perpendicular to the polygon which can also be said to be a plane (as defined in mathematics.) The normal sticks out ofthe front of the polygon, and so, in backface culling, we only want to draw polygons that are facing us.
		Considering there are six faces in a cube,drawing only those three can save at least 50% of the work from the rest of your renderer.
	www.therfcc.org /hidden-face-removal-71046.html (727 words)

	Citations: Worst-case optimal hidden-surface removal - McKenna (ResearchIndex) (Site not responding. Last check: 2007-10-18)
		In [19] Nurmi gives an algorithm for general hidden line elimination that runs in O(n I) log n) time, where I is the number of pairs of line segments whose projections on intersect (I is O(n 2) Schmitt [25] also achieves this bound.
		In the hidden line elimination problem one is given a set of simple, non intersecting planar polygons in 3 dimensional space, and a projection plane, and wishes to determine which portions of the polygonal boundaries are visible when viewed in a direction normal to, assuming all the polygons....
		A slightly different version is the hidden line elimination problem, where we are concerned only with the visibility of the edges (and not regions) The algorithms for....
	citeseer.ist.psu.edu /context/42786/0 (2867 words)

	GameDev.net - Hidden Surface Removal (Site not responding. Last check: 2007-10-18)
		This trainer is on 3d hidden face removal and face sorting.
		Face it towards you, and number all the corners from one to four in a clockwise direction.
		A negative value means that the poly is facing you, a posotive value means that it is pointing away.
	www.gamedev.net /reference/articles/article365.asp (1293 words)

	Stain Removal (Site not responding. Last check: 2007-10-18)
		Always test stain removers on a napkin or other hidden part of the cloth for color fastness.
		Apply stain remover to the underside of the stain, forcing stain off the fabric surface instead of going through it.
		Pre-treat with pre-wash stain remover, liquid laundry detergent, or a paste of powder detergent and water.
	www.butlersguild.com /guests/general/stain_removal.html (2037 words)

	4-D illusion. Got it! (Site not responding. Last check: 2007-10-18)
		When the cube moves again, you see other faces appear from behind the 'front' face as the front face rotates away from the field of view.
		When the cube moves again, other faces appear from behind the 'front' face as the front face rotates away fron the field of view and disappears behind the 4-D cube.
		This is a fairly unique video, since is includes proper hidden face removal while preserving the proper translucency of the 3-D faces for a 'real' 4-D view of the object.
	www.linuxfromscratch.org /pipermail/lfs-chat/2003-May/013639.html (398 words)

	Encyclopedia: Computer graphics
		Rasterization is the task of taking an image described in an outline format, and converting it into a series of dots for output on a dot matrix display or printer.
		The van der Waals equation is an equation of state for a fluid composed of particles that have a non-zero size and a pairwise attractive inter-particle force (such as the van der Waals force.
		Suppose the smiley face in the top left corner is an RGB bitmap image.
	www.nationmaster.com /encyclopedia/Computer-graphics (3205 words)

	CT30574E: Graphics Programming and Animation - Week 1
		Before we rasterize any of these objects, we must solve the problem of hidden surface removal to discover whether each object is visible to the viewer, or is obscured from the viewer by other objects.
		Surface properties typically vary smoothly across a face, allowing computations for one part of a face to be modified incrementally to apply to adjacent parts.
		If one planar face penetrates another, their line of intersection can be determined from the two points of intersection.
	mercury.tvu.ac.uk /gpa/gpa_10.html (1664 words)

	Face in TutorGig Encyclopedia (Site not responding. Last check: 2007-10-18)
		The lower half of the face is blue with rectangular eyes, a triangle mouth and vertical bars..
		The rear face is usually hidden by long thick hair, and resembles the face of a hyena.
		was upon the face of the deep and the Spirit of God moved upon the face of the waters.
	www.tutorgig.com /es/Face/6 (957 words)

	Hidden Face Removal Encyclopedia Article, Definition, History, Biography (Site not responding. Last check: 2007-10-18)
		Hidden Face Removal Encyclopedia Article, Definition, History, Biography
		Looking For hidden face removal - Find hidden face removal and more at Lycos Search.
		Look for hidden face removal - Find hidden face removal at one of the best sites the Internet has to offer!
	www.stardustmemories.com /encyclopedia/Hidden_face_removal (700 words)

	hidden face of Australia : Fool Moon
		The aboriginal indegenous population of Australia have become hidden in Australian society not heard of and hidden in the background.
		The removal of Apartheid in South Africa and the fall of Segregation in the US happened because the fl population protested, and often lost their lives in the process; the Aborigines must do the same thing.
		I think it is true that (most of) the white population in Australia likes the status quo; they are "relaxed" as the article says because they seldom see people of colored skin, or maybe they feel pity for the Aborigines but think that their state is all their own fault.
	foolmoon.com /showflat.php?Number=187181 (553 words)

	Eye Removal
		In December 2003 she has both removed and had a implant lens in the right eye, which successful took for 7 months -, unfortunately the vet surgeon had to remove it much too our disappointment but now she has developed Glaucoma problems in the left eye, the transplant eye is ok but is slowly shrinking.
		Her left eye was removed in March of 2000 and a prosthesis inserted (the veterinary ophthalmologist in the Washington, DC area charged $600, and that included $350 for the implant).
		She never really showed signs of pain, but once it was removed she perked right up and became full of joy and energy that we realized she was in pain after all.
	www.blinddog.info /eyes.htm (18497 words)

	Wrinkles, Options for Wrinkle Removal, Ageing Face and Skin \| Acne news (Site not responding. Last check: 2007-10-18)
		The face having a much shallower layer of subcutaneous tissue is one of the first places that wrinkles will appear.
		Autologous fat transfer is a wrinkle filler procedure in which fat is removed from one part of the body, such as the thighs, buttocks or stomach, via tumescent liposuction and used to fill in deeper wrinkles and contour the "hills and valleys" associated with aging.
		This is a more involved procedure because fat is removed from one part of the body and added to another.
	www.aceblo.com /node/329 (705 words)

	Hidden - Definition of Hidden by Webster's Online Dictionary (Site not responding. Last check: 2007-10-18)
		hidden - not accessible to view; "concealed (or hidden) damage"; "in stormy weather the stars are out of sight"
		hidden - covered from view; "her face buried (or hidden) in her hands"; "a secret buried deep within herself"
		hidden - designed to elude detection; "a hidden room or place of concealment such as a priest hole"; "a secret passage"; "the secret compartment in the desk"
	www.webster-dictionary.org /definition/Hidden (146 words)

	PocketC graphics, 2D rotation & user functions (Site not responding. Last check: 2007-10-18)
		It is important to note that all the objects are draw in the same way; from right to left round the object.
		A simple piece of code like this does not have to be well organised but once you reach the level of 3D polygons with shaded surfaces and hidden face removal organisation is everything.
		The leap from 2D to 3D rotation is not a massive one.
	www.sundialsoft.freeserve.co.uk /sddocs007.htm (938 words)

	[No title]
		The theory behind Z-shading is that a face usually darkens when moving farther away from the light.
		As we store the center Z-values for all our faces in a variable called Centers we can easily determine the distance from the light to the center of the face.
		However} { consider the fact that half of the objects faces } { is removed by hidden face removal.
	www.phys.uu.nl /~0307467/docs/pxdtut/pxdtut4.txt (1967 words)

	Centro de Medios Independientes - Human Face of MTN Range Removal -
		Next come the giant earth movers (GEM) that dump that which is not coal (overburden) into nearby valleys, burying mountain streams with pulverized rock, iron, copper, lead, chromium, mercury, and many other heavy metals that were once buried deep in the earth.
		Next, the coal is removed and sent down the mountain by beltline.
		The sludge generated from this process settles in the bottom of the tank and then is pumped back up the mountain into huge toxic sludge lakes confined by an earthen dam.
	ecuador.indymedia.org /es/2005/01/7710.shtml (1522 words)

	Glossary - GPWiki
		Backface Culling is the process by which Polygons (usually triangles) that are not facing the Camera are removed from the Rendering Pipeline.
		A binary heap is a useful data structure if you have a collection of objects to which you are adding random objects and need to remove the object with the highest (or lowest, or the extreme of some other ordering) value.
		In graphics: The process of removing parts of geometry that are outside the screen during drawing.
	gpwiki.org /index.php/Glossary (3112 words)

	Hidden Surface Removal (Site not responding. Last check: 2007-10-18)
		Portal textures for example, merging the use of portals with texture maps; face determination trees which use the BSP tree as a temporary structure in which to build the more complex, and the use of BSP trees in mobile scenes.
		The hidden-surface removal (HSR) stage is the most computationally expensive phase of the simple rendering pipe-line and contributes significantly to the most complex rendering pipeline.
		Before any scene can be displayed to the screen, the order in which the polygons are drawn in object space algorithms, or pixels in image space, must be calculated.
	www.btinternet.com /~dradamjames/PHD/hsr.html (398 words)

	SLIDE Pipeline Assignment 5
		Back face culling is when you do not render a polygon because its normal is pointing away from the viewer's eye point.
		A more sophisticated way of making this check is to transform the face's normal into the projection space, where the line of sight vector is always the negative Z-axis.
		Then the check for back face culling is just to see if the Z component of the transformed normal is negative.
	www.cs.berkeley.edu /~ug/slide/pipeline/assignments/as5 (1262 words)

	hidden flag - Definition of hidden flag by Webster's Online Dictionary (Site not responding. Last check: 2007-10-18)
		hidden flag - (scientific computation) An extra option added to a routine without changing the calling sequence.
		For example, instead of adding an explicit input variable to instruct a routine to give extra diagnostic output, the programmer might just add a test for some otherwise meaningless feature of the existing inputs, such as a negative mass.
		The use of hidden flags can make a program very hard to debug and understand, but is all too common wherever programs are hacked in a hurry.
	www.webster-dictionary.org /definition/hidden%20flag (104 words)

	[No title]
		With this, you can skip drawing faces which would not be visible on the screen when the entire object has been draw.
		We're going to use the latter, that is, we are going to implement code to perform socalled hidden face removal.
		Well, as usual, there are several ways to determine if a face should or should not be drawn on the screen.
	web.textfiles.com /computers/remove.txt (1156 words)

	Hidden line removal -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-18)
		Hidden line removal -- Facts, Info, and Encyclopedia article
		Hidden line removal is an extension of (Click link for more info and facts about wireframe) wireframe rendering where lines (or segments of lines) covered by surfaces are not drawn.
		This is not the same as (Click link for more info and facts about hidden face removal) hidden face removal since this involves depth and occlusion while the other involves normals.
	www.absoluteastronomy.com /encyclopedia/h/hi/hidden_line_removal.htm (157 words)

	Chapter 17 -- Advanced Graphics: Multimedia (Site not responding. Last check: 2007-10-18)
		The main method of achieving a 3D effect with the shape is to keep the picture rotating continuously, but perspective, shading, and hidden face removal also help achieve this effect.
		The faces are polygons that have only one side, or plane, that is visible.
		Thus all of the hidden face removal is taken care of.
	docs.rinet.ru:8080 /JWP/ch17.htm (3270 words)

	Hidden Entities Removal
		Face: a polygon, given by its vertices v
		Outward normal to a face: N = (v
		See ‘point hidden by polygon’; for how to deal with ‘point obscured by a face’
	www.cse.ohio-state.edu /~gurari/course/cis681/cis681Ch13.html (435 words)

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