Townsend (unit) - Revision history

147.251.27.29: better explanation

2014-08-28T13:58:13Z

better explanation

← Older revision		Revision as of 15:58, 28 August 2014
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	~~{{expert\|date=February 2012}}~~		Wilber Berryhill is the name his parents gave him and he totally digs that name. My day occupation is an invoicing officer but I've currently utilized for another 1. Alaska is the only location I've been residing in but now I'm considering other options. I am really fond of to go to karaoke but I've been using on new issues recently.<br><br>my weblog best psychic - [http://help.ksu.edu.sa/node/65129 help.ksu.edu.sa],
	~~In [[3D computer graphics]], '''Schlick's approximation'''~~ is ~~a formula for approximating~~ the ~~contribution of the [[Fresnel equation\|Fresnel term]] in the [[specular reflection]] of light from a non-conducting interface (surface) between two media~~.

	~~According to Schlick~~'~~s model,~~ the ~~specular [[reflection coefficient]]~~ ''R'~~' can be approximated by:~~

	:<~~math~~>~~R(\theta) = R_0 + (1 - R_0)(1 - \cos \theta)^5~~<~~/math~~>

	:~~<math>R_0 = \left(\frac{n_1-n_2}{n_1+n_2}\right)^2<~~/~~math>~~

	~~where <math>\theta<~~/~~math> is the angle between the viewing direction and the half-angle direction, which is halfway between the incident light direction and the viewing direction, hence <math>\cos\theta=(H\cdot V)</math>~~. ~~And <math>n_1,\,n_2</math> are the indices of refraction of the two medias at the interface and <math>R_0</math> is the reflection coefficient for light incoming parallel to the normal (i~~.e.~~, the value of the Fresnel term when <math>\theta = 0<~~/~~math> or minimal reflection). In computer graphics, one of the interfaces is usually air, meaning that <math>n_1<~~/~~math> very well can be approximated as 1~~.

	~~==See also==~~
	~~{{portal\|Computer graphics}}~~
	* [[Phong reflection model]]
	* [[Blinn-Phong shading model]]
	* [[Fresnel equations]]

	~~==References==~~
	* {{cite doi\|10.~~1111/1467-8659~~.~~1330233}}~~

	~~[[Category:3D computer graphics~~]]

	~~{{compu-graphics-stub}}~~

202.173.175.62: Missing word.

2013-07-17T14:59:11Z

Missing word.

← Older revision		Revision as of 16:59, 17 July 2013
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	~~The author~~ is ~~known as Wilber Pegues. Invoicing is what I do~~ for a ~~residing but I've always needed my own company~~. ~~Some time ago he chose~~ to ~~live in North Carolina and he doesn~~'~~t plan on changing it. It~~'~~s not a typical thing but what I like performing~~ is ~~to climb but I don't have~~ the ~~time lately~~.<br><br>~~Feel free~~ to ~~surf to my web site: online reader~~ (~~[http:~~//~~www~~.~~article~~-~~galaxy~~.~~com~~/~~profile.php?a=143251 www.article~~-~~galaxy~~.~~com~~])		{{expert\|date=February 2012}}
			In [[3D computer graphics]], '''Schlick's approximation''' is a formula for approximating the contribution of the [[Fresnel equation\|Fresnel term]] in the [[specular reflection]] of light from a non-conducting interface (surface) between two media.

			According to Schlick's model, the specular [[reflection coefficient]] ''R'' can be approximated by:

			:<math>R(\theta) = R_0 + (1 - R_0)(1 - \cos \theta)^5</math>

			:<math>R_0 = \left(\frac{n_1-n_2}{n_1+n_2}\right)^2</math>

			where <math>\theta</math> is the angle between the viewing direction and the half-angle direction, which is halfway between the incident light direction and the viewing direction, hence <math>\cos\theta=(H\cdot V)</math>. And <math>n_1,\,n_2</math> are the indices of refraction of the two medias at the interface and <math>R_0</math> is the reflection coefficient for light incoming parallel to the normal (i.e., the value of the Fresnel term when <math>\theta = 0</math> or minimal reflection). In computer graphics, one of the interfaces is usually air, meaning that <math>n_1</math> very well can be approximated as 1.

			==See also==
			{{portal\|Computer graphics}}
			* [[Phong reflection model]]
			* [[Blinn-Phong shading model]]
			* [[Fresnel equations]]

			==References==
			* {{cite doi\|10.1111/1467-8659.1330233}}

			[[Category:3D computer graphics]]

			{{compu-graphics-stub}}

89.235.222.237 at 12:55, 8 August 2012

2012-08-08T12:55:05Z

New page

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