首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
It was hard to picture the semi-opaque milk in Shrek I.
It was hard to picture the semi-opaque milk in Shrek I.
admin
2022-04-28
13
问题
It was hard to picture the semi-opaque milk in Shrek I.
In Shrek, some say the most difficult shot to produce was that of a small glass of milk. By the time Shrek 2 came out in 2004, vastly improved software for rendering milk meant that the guards in the sequel went crazy for the stuff, even going so far as dumping boiling milk on a walking gingerbread man.
Milk was previously difficult to model realistically because it is translucent. In the first Shrek, it was modeled as an opaque fluid, which meant the light bounced straight off its surface, making it look like paint.
To build a realistic model of milk, in 2001, Henrik Wann Jensen at the University of California, San Diego, and colleagues added reflections from light scattering beneath the milk’ s surface. They used a technique that was later used to make Gollum’ s skin look eerily realistic in The Lord of the Rings trilogy. Now, insights gained during this progress are being put to work in the dairy industry, in the name of quality control.
To model just how light moves under the surface of a substance, Jensen specifies the substance, ability to scatter, absorb, refract and spread light. He deduces what values each property should have for a given substance by shining a spot of light onto a sample and measuring how the light intensity fades from the centre of the spot. Software then uses those properties to create a realistic model of the light moving and scattering beneath the surface.
Now Flemming Moller, a researcher at Danish food-ingredient company Danisco, is borrowing Jensen’ s technique to help determine particle sizes in drinking yogurt and to measure the size of air bubbles and ice crystals in ice cream—important for quality control and standardization. Like Jensen, he shines a spot of laser light on the yogurt or ice cream. As he has already correlated how the resulting pattern varies with particle and air bubble size, he can determine them from the shape of the spot. This allows Moller to test the products’ quality without having to sample the food invasively, something that always carries a risk of contamination. It also removes the need to dilute the samples, which is necessary for standard light-based tests.
The technique is not used routinely at Danisco but Moller hopes it will become widespread. "This work has been an eye-opener," he says. "I thought that computer graphics were very simple—you sit down and it’ s a lot of nerds. I was very surprised that there was a lot of science behind it. "
Compliments aside, Jensen has since updated the milk model so that it can be programmed to vary the sub-surface scattering and reflection according to the relative fat and protein composition of the milk. The primary light-scattering particles in skimmed milk are clumps of protein, but whole milk also contains fat globules. Jensen’ s model uses this to work out how to vary the way milk looks according to the fat and protein composition. He found that skimmed milk looks bluish, because protein molecules scatter blue light preferentially and whole milk looks white, because fat globules scatter all frequencies equally.
He can also reverse the process to determine the fat and protein content of a sample of milk—and therefore the type of milk just by shining light on it. He does this by running multiple milk simulations, tweaking the fat and protein content with each run until the optical properties of the simulated milk—and therefore the fat and protein content—match that of the real thing. Moller hopes to use the same technique to more precisely determine particle size in a sample.
Jensen believes that such models will have other applications. By measuring how pollutants affect the optical properties of seawater, a model similar to the milk model could be used to monitor and interpret changes in the oceans, he says. And a model of the atmosphere might allow changes in its composition to be tracked.
选项
A、TEUE
B、FALSE
答案
F
解析
转载请注明原文地址:https://kaotiyun.com/show/rzPd777K
本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
0
公共英语五级笔试
公共英语(PETS)
相关试题推荐
Welearnfromthepassagethatnavigationcomputers______.Withanavigationcomputer,adriverwilleasilyfindthebestrout
Whatroledomostpeopleinthemanufacturingtradesplay?
ThespeakersaremakingarrangementsforMonday,TuesdayandWednesday.
ThespeakersaremakingarrangementsforMonday,TuesdayandWednesday.
Themovementofthesuncreatesperiodsof______.
Themovementofthesuncreatesperiodsof______.
Duringtheperiod1490~1979themainprogressmentionedinthispassagewas______.Theword"scuba"is______.
AstunnedHollywooddebatedthefutureofoneofitsbiggeststarsSunday.Asasheriff’swatchdoglaunchedaninvestigationint
RecentsurveysshowthatJapaneseyouthhavebecomea"MeGeneration"thatrejectstraditionalvalues."Around1980manyJap
Itwashardtopicturethesemi-opaquemilkinShrekI.
随机试题
下列关于鼓励交易原则在合同法上的体现,表述不正确的是()
该患者进一步确诊的首选辅助性检查项目是患者行鞍区肿瘤切除术后第3天,出现意识障碍,经CT复查,未发现颅内血肿及脑积水考虑下一步治疗措施时,下列哪项是错误的
A.命门、安肾B.百会、后海C.阳明、滴明D.肛脱、后海E.胸膛、通关治疗牛腰胯痛、尿闭宜选
急性心肌梗死时心电图检查最具特征性的改变为
FIDIC分包合同的履行管理中,正确的是( )。
关于冬期桩基施工的说法,正确的有()。
(凡要求计算的题目,除题中特别加以标明的以外,均需列出计算过程;计算结果出现小数的,除题中特别要求以外,均保留小数点后两位小数;计算结果有单位的,必须予以标明。凡要求说明理由的内容,必须有相应的文字阐述。)某企业计划进行某项投资活动,拟有甲、乙两个方案。
甲国有资本控股公司拟将所持有的部分国有产权转让乙公司。根据企业国有产权转让管理法律制度的规定,下列有关该国所有产权转让价款的表述中,正确的是()。
某企业于2002年11月接受一项产品安装任务,采用完工百分比法确认劳务收入,预计安装期14个月,合同总收入200万元,合同预计总成本为158万元。至2003年底已预收款项160万元,余款在安装完成时收回,至2003年12月31日实际发生成本152万元,预计
特别任务法常用于()。
最新回复
(
0
)