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Goldenthal R.,Industrial Light and Magic
ACM SIGGRAPH 2011 Talks, SIGGRAPH'11 | Year: 2011

The motion of hair is generally smooth - nearby hair strands move in a similar manner. This allows to compute the motion on a subset of the hairs which is often referred to as the guide hairs. The motion of the rest of the hairs is derived through interpolation, these hairs are referred to as interpolated hairs. © 2011 ACM. Source

Hsieh P.-L.,University of Southern California | Ma C.,University of Southern California | Yu J.,Industrial Light and Magic | Li H.,University of Southern California
Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition | Year: 2015

We introduce a realtime facial tracking system specifically designed for performance capture in unconstrained settings using a consumer-level RGB-D sensor. Our framework provides uninterrupted 3D facial tracking, even in the presence of extreme occlusions such as those caused by hair, hand-to-face gestures, and wearable accessories. Anyone's face can be instantly tracked and the users can be switched without an extra calibration step. During tracking, we explicitly segment face regions from any occluding parts by detecting outliers in the shape and appearance input using an exponentially smoothed and user-adaptive tracking model as prior. Our face segmentation combines depth and RGB input data and is also robust against illumination changes. To enable continuous and reliable facial feature tracking in the color channels, we synthesize plausible face textures in the occluded regions. Our tracking model is personalized on-the-fly by progressively refining the user's identity, expressions, and texture with reliable samples and temporal filtering. We demonstrate robust and high-fidelity facial tracking on a wide range of subjects with highly incomplete and largely occluded data. Our system works in everyday environments and is fully unobtrusive to the user, impacting consumer AR applications and surveillance. © 2015 IEEE. Source

Yu J.,Industrial Light and Magic | Wojtan C.,IST Austria | Turk G.,Georgia Institute of Technology | Yap C.,New York University
Computer Graphics Forum | Year: 2012

We introduce the idea of using an explicit triangle mesh to track the air/fluid interface in a smoothed particle hydrodynamics (SPH) simulator. Once an initial surface mesh is created, this mesh is carried forward in time using nearby particle velocities to advect the mesh vertices. The mesh connectivity remains mostly unchanged across time-steps; it is only modified locally for topology change events or for the improvement of triangle quality. In order to ensure that the surface mesh does not diverge from the underlying particle simulation, we periodically project the mesh surface onto an implicit surface defined by the physics simulation. The mesh surface gives us several advantages over previous SPH surface tracking techniques. We demonstrate a new method for surface tension calculations that clearly outperforms the state of the art in SPH surface tension for computer graphics. We also demonstrate a method for tracking detailed surface information (like colors) that is less susceptible to numerical diffusion than competing techniques. Finally, our temporally-coherent surface mesh allows us to simulate highresolution surface wave dynamics without being limited by the particle resolution of the SPH simulation. © 2012 The Author(s). Source

Yu J.,Industrial Light and Magic | Turk G.,Georgia Institute of Technology
ACM Transactions on Graphics | Year: 2013

In this article we present a novel surface reconstruction method for particlebased fluid simulators such as Smoothed Particle Hydrodynamics. In particle-based simulations, fluid surfaces are usually defined as a level set of an implicit function. We formulate the implicit function as a sum of anisotropic smoothing kernels, and the direction of anisotropy at a particle is determined by performing Principal Component Analysis (PCA) over the neighboring particles. In addition, we perform a smoothing step that repositions the centers of these smoothing kernels. Since these anisotropic smoothing kernels capture the local particle distributions more accurately, our method has advantages over existing methods in representing smooth surfaces, thin streams, and sharp features of fluids. Our method is fast, easy to implement, and our results demonstrate a significant improvement in the quality of reconstructed surfaces as compared to existing methods. © 2013 ACM. Source

News Article | June 28, 2016
Site: http://www.techtimes.com/rss/sections/space.xml

The model of the Star Trek starship USS Enterprise, which has been featured prominently at the Smithsonian's basement gift shop, is about to be beamed up to the central atrium on Tuesday, June 28, as part of the upcoming celebration of the museum's 40th birthday. Malcolm Collum, a conservator for the Smithsonian National Air and Space Museum, explained that they decided to showcase the Enterprise replica in recognition of the historical significance it had gained over the years. The Star Trek starship model was donated by Paramount Studios to the museum in 1974, back when Star Trek was simply a short-lived television series. However, just when the show started to gain popularity among sci-fi fans, the Enterprise replica started to show several structural failures and was already falling apart. Some of the housings for the Enterprise's engine, known as nacelles, have started to sag, while the paint job on the model were also beginning to flake. This spurred Collum to transfer the starship to the museum's conservation laboratory for some much needed repairs in 2014. Collum and his colleagues were able to restore the USS Enterprise to resemble its original form back in 1967, when it was used during the filming of the Star Trek episode, "Trouble with Tribbles." They made use of stills and photographs from old episodes in order to get the look of the original. This was the first time the replica received modifications for close to 50 years. Some of the modifications to the starship Enterprise Collum and his team made include applying a fresh coat of green-gray paint to return it to its original color, replacing old incandescent bulbs with LEDs that won't cause any fires when turned on and adding an authentic deflector dish to replace the one that was missing when the replica was donated in 1974. "When you turn on the lights, it just brings the ship to life," Collum pointed out. "It's an incredible transformation." The Smithsonian also collaborated with Industrial Light and Magic (ILM) visual effects studio to add details to the Enterprise to make it look more like an authentic starship that has traveled through space for years. ILM placed streaks and specks of bronze paint to its exterior, as well as letterings on the side of the starship using the same technology used to make the original markers on the model. The USS Enterprise is one of the many aerospace and aviation models set to be featured during the Smithsonian National Air and Space Museum's birthday celebration. The museum will stay open all night on Friday, July 1, to allow visitors to stargaze at the Smithsonian's observatory, view space-themed films and even participate in scavenger hunts organized by the museum. © 2016 Tech Times, All rights reserved. Do not reproduce without permission.

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