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More realistic simulated cloth for more realistic video games and moviesPublic release date: 12-Aug-2013 [ | E-mail | Share ]
Contact: Ioana Patringenaru ipatrin@ucsd.edu 858-822-0899 University of California - San Diego
Computer scientists develop new model to simulate cloth on a computer with unprecedented accuracy
Computer scientists at the University of California, San Diego, have developed a new model
to simulate with unprecedented accuracy on the computer the way cloth and light interact.
The new model can be used in animated movies and in video games to make cloth look more realistic.
Existing models are either too simplistic and produce unrealistic results; or too complex
and costly for practical use. Researchers presented their findings at the SIGGRAPH 2013
conference held July 21 to 25 in Anaheim, Calif.
"Not only is our model easy to use, it is also more powerful than existing models," said Iman
Sadeghi, who developed the model while working on his Ph.D. in the Department of Computer
Science and Engineering at UC San Diego. He currently works for Google in Los Angeles, after earning his Ph.D. in 2011.
"The model solves the long standing problem of rendering cloth," said Sadeghi's Ph.D. advisor
Henrik Wann Jensen, who earned an Academy Award in 2004 for research that brought lifelike skin to animated characters and was later used in many Hollywood block busters, including
"Lord of the Rings." "Cloth in movies and games often looks wrong, and this model is the first practical way of controlling the appearance of most types of cloth in a realistic way."
The model is based on a novel approach that simulates the interaction of light with cloth by
simulating how each thread scatters light. The model then uses that information based on the
fabric's weaving pattern. "It essentially treats the fabric as a mesh of interwoven microcylinders,
which scatter light the same way as hair, but are oriented at 90 degrees from each other," Sadeghi said.
Sadeghi is an expert on the subject of simulating light interacting with hair. While a Ph.D.
student in Jensen's research group, he developed a model that does just that and that was later used in Disney's "Tangled," a retelling of the Brothers Grimm fairy tale
Rapunzel. The animated movie's main character sported 70 feet of simulated blond hair.
"In addition to faithfully reproducing the appearance of existing fabrics, our model can act as
a framework to visualize what new fabrics would look like. We can simulate any combination
of weaving pattern and thread types," said Oleg Bisker, who co-authored the paper as part of his master's thesis on measuring and modeling light scattering from threads.
Sadeghi and Bisker presented the work at SIGGRAPH and fielded many questions from
researchers in the game and movie industries. "We expect that our model will be used in many
production pipelines soon," Sadeghi added.
Sadeghi and colleagues used the model to simulate the appearance of a very complex fabric for
the first timemore specifically a polyester satin charmeuse. That fabric is particularly tricky to
render, because of its unusual weaving pattern, which gives it a different appearance depending
on what direction and what side it is observed from. For example, in one direction, the satin
charmeuse has three mirror-like highlights on the front side of the fabric and four on the back.
To gain a deeper understanding, Sadeghi and colleagues took photographs of fabrics and even measured the scattering properties of single threads. The researchers had their "a-ha!" moment
for developing the model while looking at the fabric's weaving patterns under a microscope.
That's when they realized that these patterns accounted for the way the light scattered on the
fabrics, creating distinct highlights and overall appearance.
In their SIGGRAPH paper, the authors also simulated other types of fabric like plain linen and a
silk crepe de chine. Their goal was to demonstrate the model's ability to handle different types
of thread and an unlimited variety of weaving patterns. The only other models that may be able
to produce similar results to the one Sadeghi and colleagues developed put fabrics through a
micro-CT-scan, an expensive and time-consuming procedure.
The other computer scientist working on the paper was Joachim De Deken, a master's
student, who took measurements of fabrics.
###
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?
AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.
More realistic simulated cloth for more realistic video games and moviesPublic release date: 12-Aug-2013 [ | E-mail | Share ]
Contact: Ioana Patringenaru ipatrin@ucsd.edu 858-822-0899 University of California - San Diego
Computer scientists develop new model to simulate cloth on a computer with unprecedented accuracy
Computer scientists at the University of California, San Diego, have developed a new model
to simulate with unprecedented accuracy on the computer the way cloth and light interact.
The new model can be used in animated movies and in video games to make cloth look more realistic.
Existing models are either too simplistic and produce unrealistic results; or too complex
and costly for practical use. Researchers presented their findings at the SIGGRAPH 2013
conference held July 21 to 25 in Anaheim, Calif.
"Not only is our model easy to use, it is also more powerful than existing models," said Iman
Sadeghi, who developed the model while working on his Ph.D. in the Department of Computer
Science and Engineering at UC San Diego. He currently works for Google in Los Angeles, after earning his Ph.D. in 2011.
"The model solves the long standing problem of rendering cloth," said Sadeghi's Ph.D. advisor
Henrik Wann Jensen, who earned an Academy Award in 2004 for research that brought lifelike skin to animated characters and was later used in many Hollywood block busters, including
"Lord of the Rings." "Cloth in movies and games often looks wrong, and this model is the first practical way of controlling the appearance of most types of cloth in a realistic way."
The model is based on a novel approach that simulates the interaction of light with cloth by
simulating how each thread scatters light. The model then uses that information based on the
fabric's weaving pattern. "It essentially treats the fabric as a mesh of interwoven microcylinders,
which scatter light the same way as hair, but are oriented at 90 degrees from each other," Sadeghi said.
Sadeghi is an expert on the subject of simulating light interacting with hair. While a Ph.D.
student in Jensen's research group, he developed a model that does just that and that was later used in Disney's "Tangled," a retelling of the Brothers Grimm fairy tale
Rapunzel. The animated movie's main character sported 70 feet of simulated blond hair.
"In addition to faithfully reproducing the appearance of existing fabrics, our model can act as
a framework to visualize what new fabrics would look like. We can simulate any combination
of weaving pattern and thread types," said Oleg Bisker, who co-authored the paper as part of his master's thesis on measuring and modeling light scattering from threads.
Sadeghi and Bisker presented the work at SIGGRAPH and fielded many questions from
researchers in the game and movie industries. "We expect that our model will be used in many
production pipelines soon," Sadeghi added.
Sadeghi and colleagues used the model to simulate the appearance of a very complex fabric for
the first timemore specifically a polyester satin charmeuse. That fabric is particularly tricky to
render, because of its unusual weaving pattern, which gives it a different appearance depending
on what direction and what side it is observed from. For example, in one direction, the satin
charmeuse has three mirror-like highlights on the front side of the fabric and four on the back.
To gain a deeper understanding, Sadeghi and colleagues took photographs of fabrics and even measured the scattering properties of single threads. The researchers had their "a-ha!" moment
for developing the model while looking at the fabric's weaving patterns under a microscope.
That's when they realized that these patterns accounted for the way the light scattered on the
fabrics, creating distinct highlights and overall appearance.
In their SIGGRAPH paper, the authors also simulated other types of fabric like plain linen and a
silk crepe de chine. Their goal was to demonstrate the model's ability to handle different types
of thread and an unlimited variety of weaving patterns. The only other models that may be able
to produce similar results to the one Sadeghi and colleagues developed put fabrics through a
micro-CT-scan, an expensive and time-consuming procedure.
The other computer scientist working on the paper was Joachim De Deken, a master's
student, who took measurements of fabrics.
###
[ | E-mail | Share ]
?
AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.
SEATTLE (AP) ? An American man detained in North Korea for the past nine months has been hospitalized after losing more than 50 pounds, and the need to bring him home is becoming more urgent, his sister said Sunday.
Kenneth Bae, a 45-year-old tour operator and Christian missionary, was arrested last November and accused of subversive activities against the government. He was sentenced in May to 15 years hard labor, and in letters to his family in the Seattle area he described working in the fields weeding and planting beans and potatoes.
His sister, Terri Chung, of Edmonds, said Sunday the family recently learned that he has been transferred from the labor camp to a hospital. Her brother suffers from diabetes, an enlarged heart, liver problems and back pain, she said.
"He's considerably weaker," Chung said. "There's more urgency than ever to bring him home."
A deputy ambassador from Sweden met with Bae at the hospital Friday, Chung said. Sweden represents American interests in North Korea because the U.S. has no official diplomatic relations with the country.
Bae, a father of three, was born in South Korea and immigrated to the U.S. with his parents and sister in 1985. For the past seven years he has been living in China, and a couple of years ago began leading small tour groups, mostly of American and Canadian citizens, into a "special economic zone" designed to encourage commerce in the northeastern region of Roson in North Korea, Chung said.
Several years ago, Bae gave a sermon in which he advocated bringing Americans to North Korea for a mass prayer session to bring about the reunification of North and South Korea. The charges against him included "hostile acts" against the government.
Bae is at least the sixth American detained in North Korea since 2009. The others were eventually allowed to leave without serving out their terms, some after prominent Americans, including former presidents Bill Clinton and Jimmy Carter, visited North Korea.
The State Department has called for his release on humanitarian grounds.
Bae's recent letters to his family urged them to take a more prominent role in advocating for his release, and on Saturday night they held a prayer vigil at a Seattle church to publicize his case. About 180 people attended, said Chung, who teaches English composition at a Seattle community college.
Bae's son has started an online petition calling for his freedom.
___
Follow Johnson at https://twitter.com/GeneAPseattle
Users of the credit card and cash replacement system are advised to spend any remaining gift card balances before August 21.
On that date, Google will be disabling the NFC functionality for any gift or loyalty cards that users store in their Google Wallet. However, for those that have physical gift cards, there's no need to panic as the change will not affect them.
Google Wallet's ultimate aim is to consign debit cards, credit cards, cash and even physical coupons, loyalty cards and gift vouchers to the history books in favor of a unified virtual system that lives inside users' NFC-enabled smartphones.
The idea is that instead of fishing around in a pocket for coins, cards and tokens, simply tap a phone on the contactless payment sensor and everything is done automatically. Rewards points are redeemed or added, payments are taken from a designated account and everybody's happy.
However, since the service was launched in 2011, it has failed to capture the public's imagination, despite the fact that Google has continued to add new features and uses to it.
One of the problems that not just Google, but all other companies in the virtual wallet market face is that very few shops and stores are prepared to invest in the point of sales devices that enable consumers to pay for goods via a phone. Likewise, consumers are not prepared to sign up for the services until more shops are set up to accept payments from a phone. And of course a smartphone needs to support NFC (Near Field Communication) in order to use the app, a feature that not all companies build into their handsets.
Google hasn't clarified why it is disabling the NFC gift and loyalty card feature but has revealed that it is working on a solution and will release more details "soon".
Usher’s oldest son, Usher Raymond V, was rushed to a hospital in Atlanta, Georgia following an accident in the singer’s pool on Monday evening. Usher Raymond V nearly drowned when his hand became stuck in the pool’s drain while he was trying to retrieve a pool toy. The child was playing in the pool with ...
Indians bear witness to an estimated 1,000 acid attacks a year, largely against women rejecting unwanted marriage proposals or defending themselves against male attackers. Now, the women, often from impoverished backgrounds, are crowdfunding the thousands of dollars it costs to treat their wounds.
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Public release date: 12-Aug-2013
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Usher’s oldest son, Usher Raymond V, was rushed to a hospital in Atlanta, Georgia following an accident in the singer’s pool on Monday evening. Usher Raymond V nearly drowned when his hand became stuck in the pool’s drain while he was trying to retrieve a pool toy. The child was playing in the pool with ...
Indians bear witness to an estimated 1,000 acid attacks a year, largely against women rejecting unwanted marriage proposals or defending themselves against male attackers. Now, the women, often from impoverished backgrounds, are crowdfunding the thousands of dollars it costs to treat their wounds.