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Topic: Trilinear filtering

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	Trilinear filtering - Wikipedia, the free encyclopedia
		Trilinear filtering is an extension of the bilinear texture filtering method, which also performs linear interpolation between mipmaps.
		Since it uses both larger and smaller mipmaps, trilinear filtering cannot be used in places where the pixel is smaller than a texel on the original texture, because mipmaps larger than the original texture are not defined.
		Fortunately bilinear filtering still works, and can be used in these situations without worrying too much about abruptness because bilinear and trilinear filtering provide the same result when the pixel size is exactly the same as the size of a texel on the appropriate mipmap.
	en.wikipedia.org /wiki/Trilinear_filtering (348 words)

	Anisotropic filtering - Wikipedia, the free encyclopedia
		In 3D computer graphics, anisotropic filtering (AF) is a method of enhancing the image quality of textures on surfaces that are far away and steeply angled with respect to the camera.
		Like bilinear and trilinear filtering it eliminates aliasing effects, but introduces less blur in the process and thus preserves more detail.
		Sixteen trilinear anisotropic samples will then require 128 samples from the stored texture, as trilinear filtering needs to take four samples from each mip level and then anisotropic sampling (at 16-tap) needs to take sixteen trilinear filtered samples.
	en.wikipedia.org /wiki/Anisotropic_filtering (507 words)

	[No title] (Site not responding. Last check: 2007-10-18)
		With trilinear filtering, the resulting pixel is averaged from the four surrounding texels from the two nearest MIP maps.
		Trilinear filtering results in an improved visual quality of texture mapping, but requires eight memory reads per pixel, instead of the four memory reads for bilinear filtering, and a calculation to determine which MIP maps from which to read.
		In performing the trilinear filtering of one embodiment, a maximum scale factor, Rho, is used to select a MIP level for use in rendering a particular pixel.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=99/67748.991229&ELEMENT_SET=DECL (4749 words)

	Richard Leader: Bargain Bin Review: Anisotropic Filtering (Site not responding. Last check: 2007-10-18)
		Trilinear filtering specifies three regions allowing the central one set at mid-distance to blend the two other ranges of texture quality together, though lines are still visible) separating the three filtering sections) to astute observers.
		While it appears brighter in the bilinear and trilinear strips, the texture displayed is at a lower resolution and lacks the intricate detail of the anisotropic 8X mode.
		This results in a strange visual effect when using bilinear or trilinear filtering (the modes used by the majority of gamers) as the fence might sometimes be rendered using two different mip-maps with a seam between the two.
	www.richleader.com /bargainbinreview_anisotropic-filtering.htm (1074 words)

	3DCenter - ATi & nVidia in driver "optimizations" race
		It was clearly shown, however, that nVidia at least uses a pseudo trilinear filter particularly under Unreal Tournament 2003, as well as partial MipMaps shifts to the rear in the anisotropic filter and in some cases the full anisotropic filter did not work.
		Nevertheless, the question as to whether this general optimization of the anisotropic filter does not represent an unallowed optimization in itself has to remain unanswered, since ATi's postulated "trilinear filtering" is not achieved.
		If however the filtering is controlled by the ATi control panel it will ignore specific application requests for bilinear and trilinear filters and always deliver the bilinear/trilinear filtering mix we've shown.
	www.3dcenter.de /artikel/ati_nvidia_treiberoptimierungen/index9_e.php (1869 words)

	Battle of ATI RADEON X800 XT and NVIDIA GeForce 6800 Ultra - Part Three: Trilinear filtering (synthetic examples)
		Trilinear filtering (trilinear MIP mapping)) is a further development of bilinear filtering with MIP mapping.
		When optimised trilinear filtering is switched on, fully white and fully red areas grow to a roughly similar size in both chips.
		During optimised trilinear filtering, ATI uses bilinear filtering area which makes up about 30 percent of the whole range, and this area is offset toward more detalised MIP levels.
	www.digit-life.com /articles2/gffx/nv40-rx800-3.html (2135 words)

	What Is Trilinear filtering - GameDev.Net Discussion Forums (Site not responding. Last check: 2007-10-18)
		Linear filtering is bilinear for the texture, with trilinear interpolation between mipmap levels.
		Trilinear filtering is simply the use of mipmaps with bilinear filtering.
		Anisotropic filtering is a method to optimise the image that the pixels are taken from, based on the number of pixels the text takes up (trinilearly interpolated between as appropriate).
	www.gamedev.net /community/forums/topic.asp?topic_id=194983&whichpage=1& (770 words)

	3DCenter - Will "brilinear" filtering persist?
		The formula for the trilinear filtering is of course selected in such a way, that the textures are as sharp as possible, but texture shimmering just does not appear.
		Instead of the appearing MIP band artefact during the use of trilinear filtering the whole area is overdrawn with a so called "Tri-Band".
		The special logic of the filter which is needed for brilinear filtering had to be implemented into the hardware, i.e.
	www.3dcenter.de /artikel/2003/10-26_a_english.php (1476 words)

	Gamasutra - Features - "Run-Time MIP-Map Filtering" [12.11.98]
		The filtering of the textures either can be carried out during the startup of your game, or you can prefilter all of your textures during development.
		Once textures have been filtered, all you have to do at run time to achieve basic per-polygon MIP-mapping is to select the correct MIP-map level (or LOD) for the desired texture and pass this to the renderer.
		Bilinear filtering attempts to further reduce any aliasing errors present in a scene by averaging the values of the four pixels that are closest to the real u and v texture values for each pixel.
	www.gamasutra.com /features/19981211/flavell_01.htm (3939 words)

	Ace's Hardware (Site not responding. Last check: 2007-10-18)
		With bilinear filtering, the four neighbours of a pixel are averaged to calculate the color of a given pixel.
		With trilinear filtering, two bilinear filtered pixels from the texture map are averaged.
		Trilinear filtering looks a bit better, but using trilinear filtering also means that you need twice as much bandwidth.
	www.aceshardware.com /Spades/read.php?article_id=110 (1475 words)

	Bilinear/Trilinear Filtering - GameDev.Net Discussion Forums (Site not responding. Last check: 2007-10-18)
		Trilinear means using GL_LINEAR for min and mag filters, as well as using GL_LINEAR for the mipmap min filter.
		The algorithm uses trilinear filtering for fragments which fall midway between the two mipmap levels, but where the fragment is close to one mipmap level (using some threshold value; say >75%), it switches to bilinear filtering for efficiency.
		Brilinear filtering is a hybrid of trilinear and bilinear mipmap filtering.
	www.gamedev.net /community/forums/topic.asp?topic_id=253878&whichpage=1& (1042 words)

	August 2002 3Digest: Anisotropic filtering research
		So, bilinear filtering is used for removing sharp edges between texture pixels (for us to see the walls and floor textured not by squares, but by some smooth real-life materials), and trilinear filtering additionally dithers the scene once more interpolating edges of two bilinear-filtered MIP levels.
		Depending on filtering quality settings and surface viewing angle relative to screen plane, the standard bi- (or tri-) linear filtering is performed 1-4 times for points located on a straight line, drawn along dividing pixel, projected from the screen to texture surface along its long side (represented by an arrow on the figure).
		filtering quality will be high for values of projecting vector that are close to orts (an arrow on the figure), but as it turns, the effect will be still smaller down to the full loss of sense in using such method.
	www.digit-life.com /articles2/digest3d/1002/itogi-video-ani.html (1766 words)

	GameSpot: ATI admits to same "tricks" as Nvidia (Site not responding. Last check: 2007-10-18)
		ComputerBase.de staffers voiced concerns that ATI was possibly using application-specific cheats or optimized filtering algorithms after observing that the company's drivers rendered colored mip maps, such as those used in synthetic image-quality tests, with full trilinear filtering enabled, but the filtering method seemed to change under real game conditions in Unreal Tournament 2003.
		Trilinear filtering is a technique used to blend together two adjacent mip maps in the game environment to eliminate noticeable areas of "mip map banding" in the game where high-resolution mip maps transition to a lower level of detail.
		Trilinear filtering, however, is notoriously demanding in terms of graphics performance, but optimizations can be made to create similar image quality with less work.
	www.gamespot.com /news/6099873.html?print=1 (680 words)

	[H] Enthusiast - UT2003 Texture Filtering
		Editor's Note: Trilinear Filtering is best described as how textures seen in your game transition between each other as they fall further away from your viewpoint.
		Trilinear Filtering is a technique to get rid of that line, but can be done in several different ways.
		Anisotropic filtering was set to OFF for the screenshots with No AF and then it was set to 8X AF when we tested with AF.
	www.hardocp.com /article.html?art=NTAw (1038 words)

	trilinear filtering vs non-trilinear filtering - Red Orchestra (Site not responding. Last check: 2007-10-18)
		My advice is to turn off trilinear filtering in UT/RO and to turn on anisotropic filtering in your graphics cards controll panel, this will give you better image quality.
		Trilinear filtering blends these sharp lines out; when you look down a hall you'll see sharp textures up close, gradually becoming blurry with range.
		Anisotropic filtering is mainly useful in racing games; without it the road will never be in focus.
	www.redorchestra.clanservers.com /forums/showthread.php?p=2323 (653 words)

	UnrealWiki: Trilinear Filtering
		Bilinear filtering does not filter between different mip levels, which results in noticable lines where the mip level changes.
		Simly apply a linear filter between the mip levels after they have been applied, and you have trilinear filtering.
		Trilinear filtering eliminates the lines between mip levels resulting in a smooth transition.
	wiki.beyondunreal.com /wiki/Trilinear_Filtering (351 words)

	X-bit labs - Articles - NVIDIA GeForce3 Guide /part 2/
		Of course, anisotropic filtering requires a lot of computing resources and increases the memory bus workload significantly that's why you may notice a certain performance drop when this filtering is enabled.
		For example, in case of anisotropic filtering with 32 samples at lower resolutions the memory bus isn't overloaded because the CPU restricts the performance.
		However, fully-fledged trilinear filtering needs only 1 extra texturing unit to be involved in the process, which doesn't tell on the performance that greatly.
	www.xbitlabs.com /articles/video/display/geforce3_2.html (1726 words)

	Comments for: ATI's Radeon X800 texture filtering game - ja.zz
		Whatever the merits of ATI's adaptive trilinear filtering algorithm, ATI appears to have intentionally deceived members of the press, and by extension, the public, by claiming to use "full" trilinear filtering "all of the time" and recommending the use of colored mip map tools in order to verify this claim.
		The goal of trilinear filtering is the removal of mipmap boundaries in games which would otherwise be visible.
		The goal of trilinear filtering is not trilinear filtering, but the removal of visible mipmap boundaries, in other words.
	techreport.com /ja.zz?id=48550 (841 words)

	Sharky Extreme - Hardware - TNT in Depth
		However, due to the lack of true trilinear filtering, image quality is not up to the level of Savage4.
		TNT is capable of single pass trilinear but not when multi-texturing.
		Besides true trilinear filtering, there are implementations that approximate true trilinear filtering that produce images of reasonable quality without the performance penalty.
	www.sharkygames.com /hardware/articles/tnt-tnt2/g.shtml (254 words)

	Filtering Or Cheat?
		A trilinearly filtered 3d scene is one in which the scene's mip map boundaries are not visible either statically or in motion, and should also remove the wave/moving line effect of bilinear filtering.
		What is important to note is that trilinear filtering is an effect or end state or result, not a method.
		Bear in mind that trilinear filtering is already several times more intensive than bilinear filtering, so there's a desire/need to optimize the extra work to get the most bang for the GPU buck.
	www.overclockers.com /articles1039 (360 words)

	Do many xbox titles use trilinear filtering? - Beyond3D Forum
		Trilinear is for all intensive purposes free on NV2A, in our product one of our debug modes allowed you to force various texture modes overiding the artist specified default.
		The cache is optimised for the trilinear case.
		Yes "majority" implies that there are cases where trilinear takes longer, and my understanding is that this is the case, however I have not observed a significant cost when enabling trilinear.
	www.beyond3d.com /forum/showthread.php?t=2168 (2265 words)

	[H] Enthusiast - GeForceFX 5200 & 5600
		At "Quality" settings the ATI graphics cards use Trilinear Filtering to enhance image quality which is widely considered the norm as it produces a very good mip-map blend as objects are shown farther away from you in a game.
		This Aggressive setting positioned the NVIDIA GFFX cards at a distinct frame rate performance advantage, compared even to their own "Balanced" mode that is lacking true Trilinear Filtering, due to the fact that they are not saddled with the workload of Trilinear Filtering.
		This indicates that a higher level of filtering is present, though the degree of that filtering level is questionable.
	www.hardocp.com /article.html?art=NDQ0LDI= (1596 words)

	NV40 anisotropic filtering investigation - nV News Forums
		Trilinear Texture Filtering: Trilinear filtering is a high quality bilinear filter which uses the four closest pixels in the second most suitable mip map to produce smoother transitions between mip map levels.
		Trilinear filtering eliminates the banding effect that appears between adjacent MIP map levels.
		Trilinear filtering is capable of producing fine visuals, but it only samples from a square area which in some cases is not the ideal way.
	www.nvnews.net /vbulletin/showthread.php?t=31535 (1648 words)

	ATI's Radeon X800 texture filtering game - The Tech Report - Page 1
		First, an article at Computerbase.be alleged ATI was doing less-than-full trilinear filtering, with the exception of cases where color mip maps were used.
		If it were the case that we were only performing full trilinear with coloured mipmaps then you might have a point, but this is emphatically not what we do.
		One of our two known special cases where adapative trilinear is not applied by the ATI card, that of colored mip maps, is used as an illustration.
	techreport.com /etc/2004q2/filtering/index.x?pg=1 (832 words)

	Sharky Extreme - '+$ArtG+' - '+$ArtC+' - '+$ArtN+'
		Trilinear filtering is basically a smarter bilinear filter.
		Trilinear samples the block of four texels and averages them, just as bilinear does, then takes the equivalent four-texel block from a neighboring mip-map level and average those, too.
		Trilinear is thus primarily useful for smoothing the transition between mip-map levels, though as noted above there are also gains in color precision and reduced aliasing.
	www.sharkyextreme.com /hardware/guides/texture_filtering/4.shtml (327 words)

	AnandTech: NVIDIA GeForce 6800 Ultra: The Next Step Forward
		NVIDIA's new driver defaults to the same adaptive anisotropic filtering and trilinear filtering optimizations they are currently using in the 50 series drivers, but users are now able to disable these features.
		Trilinear filtering optimizations can be turned off (doing full trilinear all the time), and a new "High Quality" rendering mode turns off adaptive anisotropic filtering.
		The advantage is that NVIDIA now has a lower impact when enabling anisotropic filtering, and we will also be doing a more apples to apples comparison when it comes to anisotropic filtering (ATI also makes use of a weighted Manhattan scheme for distance calculations).
	www.anandtech.com /showdoc.aspx?sitesize=yes&i=2023&p=8 (789 words)

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