Nikunj Raghuvanshi

Nikunj Raghuvanshi
RESEARCHER
.

Graphics Group,
Microsoft Research,
One Microsoft Way,
Redmond, WA 98052, USA 

About Me

I like working on projects combining physics and computers. While doing undergraduate studies at IIT Kanpur, India, I worked on ray-tracing for photo-realistic light simulation. As a graduate student at UNC Chapel Hill, I got interested in sound -- creating immersive audio cues consistent with visuals for 3D scenes, like the sound of a bouncing and rolling cylinder, or the smooth shadowing of sound around a door. This led me to initiate sound simulation as a new research direction in the UNC GAMMA group where I investigated real-time sound synthesis techniques, invented a novel fast wave solver suited to large 3D scenes and introduced the first wave-simulation based technique for real-time sound propagation. Applications range from acoustic prediction for architectural design to immersive computer games.

During my PhD research, the source code was licensed by Microsoft, enabling further work within MSR. The resulting collaboration produced sound synthesis technology that shipped in Microsoft Studios' game Crackdown 2, with over a million copies sold worldwide. I have now been working in sound simulation for nearly a decade. Significant research challenges still remain and I continue to be actively interested in related problems. I am currently working on including physics-based sound propagation models in future games and augmented/virtual reality experiences.

Selected Projects

Parameter Fields for a Game Map

Parametric Wave Field Coding for Precomputed Sound
Propagation

Nikunj Raghuvanshi and John Snyder
ACM Transactions on Graphics (SIGGRAPH), 33(4), July 2014.
[Paper PDF] [PPT+Videos (385MB)] [Video (208MB)]

 

Sound Synthesis for Impact Sounds in Video Games
Brandon Lloyd, Nikunj Raghuvanshi, Naga K. Govindaraju
ACM Symposium on Interactive 3D Graphics and Games (I3D), 2011

This technology was shipped in the Xbox title Crackdown 2. In collaboration with Guy Whitmore and Kristofor Mellroth at Microsoft Game Studios.
[paper PDF] [video (hires, wmv 107MB)] 
[video (lowres, wmv 16MB)]

 

Precomputed Wave Simulation for Real-Time Sound
Propagation of Dynamic Sources in Complex Scenes
Nikunj Raghuvanshi, John Snyder, Ravish Mehra, Ming C. Lin, and Naga K. Govindaraju
ACM Transactions on Graphics (SIGGRAPH), 29(3), July 2010.
[paper PDF] [supplement PDF] [video (DivX, 261MB)] 
[PPT (slides only, 12MB)] [PPT+videos (ZIP, 550MB)]

 

ARD wave solver

Efficient and Accurate Sound Propagation using Adaptive
Rectangular Decomposition
Nikunj Raghuvanshi, Rahul Narain and Ming C. Lin
IEEE Transactions on Visualization and Computer Graphics(TVCG), 15(5), 2009.
[paper PDF] [video (WMV, 15MB)]

 

Interactive Sound Synthesis for Large Scale Virtual
Environments
Nikunj Raghuvanshi and Ming C. Lin
ACM Symposium of Interactive 3D Graphics and Games (I3D), 2006.
[paper PDF] [video (DivX, 42MB)]

 

 

Fast and Approximate Stream Mining of Quantiles and
Frequencies Using Graphics Processors
Naga K. Govindaraju, Nikunj Raghuvanshi and Dinesh Manocha
ACM SIGMOD 2005.
[paper PDF]

Publications

Brett Jones, Rajinder Sodhi, Michael Murdock, Ravish Mehra, Hrvoje Benko, Andrew Wilson, Eyal Ofek, Blair MacIntyre, Nikunj Raghuvanshi, Lior Shapira, “RoomAlive: Magical Experiences Enabled by Scalable, Adaptive Projector-Camera Units,” ACM Symposium on User Interface Software and Technology (UIST), 2014.

Ravish Mehra, Nikunj Raghuvanshi, Anish Chandak, Donald Albert, Keith Wilson, Dinesh Manocha, “Acoustic pulse propagation in an urban environment using a three-dimensional numerical simulation,” The Journal of the Acoustical Society of America, 2014.

Nikunj Raghuvanshi, John Snyder, “Parametric Wave Field Coding for Precomputed Sound Propagation,” ACM Transactions on Graphics (SIGGRAPH), 2014.

Ravish Mehra, Nikunj Raghuvanshi, Lakulish Antani, Anish Chandak, Sean Curtis, Dinesh Manocha, “Wave-Based Sound Propagation in Large Open Scenes using an Equivalent Source Formulation,” ACM Transactions on Graphics, 2013.

Ravish Mehra, Nikunj Raghuvanshi, Lauri Savioja, Ming Lin, Dinesh Manocha, “An Efficient GPU-based Time Domain Solver for the Acoustic Wave Equation,” Journal of Applied Acoustics (Elsevier), 2012.

D. Brandon Lloyd, Nikunj Raghuvanshi, and Naga K. Govindaraju, “Sound synthesis for impact sounds in video games,” ACM Symposium on Interactive 3D Graphics and Games (I3D), 2011.

Nikunj Raghuvanshi, John Synder, Ravish Mehra, Ming C. Lin, and Naga K. Govindaraju, “Precomputed Wave Simulation for Real-Time Sound Propagation of Dynamic Sources in Complex Scenes,” ACM Transactions on Graphics (SIGGRAPH), 2010.

Nikunj Raghuvanshi, Brandon Lloyd, Naga K. Govindaraju, and Ming C. Lin, “Efficient Numerical Acoustic Simulation on Graphics Processors using Adaptive Rectangular Decomposition,” European Acoustics Association Symposium on Auralization, 2009.

Nikunj Raghuvanshi, Rahul Narain and Ming C. Lin, “Efficient and Accurate Sound Propagation using Adaptive Rectangular Decomposition,” IEEE Transactions on Visualization and Computer Graphics (TVCG), 2009.

Nikunj Raghuvanshi, Nico Galoppo and Ming C. Lin, “Accelerated Wave-based Acoustics Simulation,” ACM Solid and Physical Modeling Symposium, 2008.

Nikunj Raghuvanshi, Christian Lauterbach, Anish Chandak, Dinesh Manocha, and Ming C. Lin, “Real-Time Sound Synthesis & Propagation for Games,” Communications of the ACM, 2007.

Nikunj Raghuvanshi and Ming C. Lin, “Physically Based Sound Synthesis for Large-Scale Virtual Environments,” IEEE Computer Graphics and Applications, 2007.

Nikunj Raghuvanshi and Ming C. Lin, “Interactive Sound Synthesis for Large Scale Environments,” ACM Symposium on Interactive 3D Graphics and Games (I3D), 2006.

Naga K. Govindaraju, Nikunj Raghuvanshi, and Dinesh Manocha, “Fast and Approximate Stream Mining of Quantiles and Frequencies Using Graphics Processors,” ACM SIGMOD, 2005.

Nikunj Raghuvanshi and Sanjay G. Dhande, “Raytraced rendering using t-buffer and shadow-buffer,” International Journal of Information Technology, 2004.

[Tech Report] Naga K Govindaraju, Nikunj Raghuvanshi, Michael Henson, Dinesh Manocha. “A cache-efficient sorting algorithm for database and data mining computations using graphics processors.” University of North Carolina at Chapel Hill, TR05-016, 2005.