Amitabh Varshney

Varshney attended school at St Gabriel's Academy, Roorkee in Uttarakhand, India. Varshney went on to attend Indian Institute of Technology, Delhi, graduating with a B.Tech in Computer Science & Engineering in 1989. He continued his education at the University of North Carolina, Chapel Hill, earning an M.S. in Computer Science in 1991, and a Ph.D. in Computer Science in 1994.

Varshney worked as an assistant professor of Computer Science at Stony Brook University from 1994 to 2000. Since 2000, he is working as a professor of Computer Science at the University of Maryland, College Park.

Varshney's research pertains to the applications of computer graphics and visualization in engineering, science, and medicine via developments in mesh processing, shading algorithms, perceptual image synthesis, and high-performance visual computing. His findings have been used in a variety of fields including pharmacology, meteorology, plasma physics, nanomanufacturing, medical imaging, and genealogy.{{cite web|url=https://www.umiacs.umd.edu/people/varshney|title=Amitabh Varshney - UMIACS|website=www.umiacs.umd.edu}} Varshney is most renowned for his many studies on level of detail.{{cite book|url=https://books.google.com/books?id=M-gl4aoxQfIC&pg=PP2|title=Level of Detail for 3D Graphics|first=David P.|last=Luebke|date=5 August 2018|publisher=Morgan Kaufmann|via=Google Books|isbn=9781558608382}}

In their 1994 report, Varshney, Fred Brooks, and William Wright detail their advances in graphically modeling molecular surfaces:

{{quote|We have developed an algorithm for efficiently computing a smooth molecular surface. Our algorithm parallelizes easily and scales linearly with the number of atoms in a molecule ...

Our algorithm provides an order of magnitude improvement over the previous best known algorithms for molecules with moderately large numbers of atoms-on the order of a few thousands or morein both sequential and parallel implementations.{{cite journal|title=Computing smooth molecular surfaces - IEEE Journals & Magazine|doi=10.1109/38.310720|s2cid=16938760}}}}

In 1996, Varshney published an algorithm for real-time simplifications of polygons in a 3-dimensional model:

A continuous level-of-detail representation for an object is first constructed off-line. This representation is then used at run-time to guide the selection of appropriate triangles for display. The list of displayed triangles is updated incrementally from one frame to the next. Our approach is more effective than the current level-of-detail-based rendering approaches for most scientific visualization applications where there are a limited number of highly complex objects that stay relatively close to the viewer.[http://delivery.acm.org/10.1145/250000/245627/p327-xia.pdf?ip=128.8.91.24&id=245627&acc=ACTIVE%20SERVICE&key=5F8E7AA76238C9EB%2E737F10F6E50A862B%2E4D4702B0C3E38B35%2E4D4702B0C3E38B35&__acm__=1530058767_0da86fcddd612d94d090651c84865b97]{{dead link|date=August 2018}}

Also in 1996, Varshney published "Optimizing Triangle Strips for Fast Rendering". The study introduced new algorithms for rendering triangle strips in conjuncture with partially triangulated models. Describing their more efficient triangle strip algorithm, Varshney et al. write:

By using triangle strips ... , we can describe the triangulation using the strip ... and assuming the convention that the ith triangle is described by the ith, (i + 1)st, and (i + 2)nd vertices of the sequential strip. Such a sequential strip can reduce the cost to transmit n triangles from 3n to n + 2 verticies.{{cite journal|title=Optimizing triangle strips for fast rendering - IEEE Conference Publication|doi=10.1109/VISUAL.1996.568125|s2cid=11305302|citeseerx=10.1.1.53.9966}}

Varshney proposed the idea of simplification envelopes as a method of simultaneously preserving both global and local topology. A surface's envelope is a shell-like structure consisting of a pair of surfaces a distance ε on either side of the original surface.{{cite web|url=http://gamma.cs.unc.edu/ENVELOPES/ENVELOPES.pdf |title=Envelopes |website=gamma.cs.unc.edu }} Each surface has its own level of detail, often referred to as the 'hierarchy of LOD'.{{cite web|url=https://webdocs.cs.ualberta.ca/~anup/Courses/604/NOTES/SimplificationEnvelopes.pdf |title=Course notes |website=webdocs.cs.ualberta.ca }}

Many consider the main drawback of simplification envelopes to be that the algorithms for their calculation are difficult to program.{{cite web|url=http://old.cescg.org/CESCG-2001/RLeitner/node3.html|title=Simplification Algorithms|website=old.cescg.org}}

In 2002, Varshney published the first edition of "Level of Detail for 3D Graphics". The book details several principles for optimizing 3D rendering including:

• The use of multiple discrete levels of detail (LODs) in lieu of a single view-dependent LOD
• Topology-preserving and topology-sensitive simplification algorithms to maximize fidelity
• The use of multiple LODs in multiple instantiations in gaming consoles and other constant frame-rate systems
• Double buffering, frame locking, and frame-latency manipulation to eliminate tearing and maximize temporal control{{cite book|url=https://books.google.com/books?id=M-gl4aoxQfIC&pg=PP2|title=Level of Detail for 3D Graphics|first=David P.|last=Luebke|date=5 August 2018|publisher=Morgan Kaufmann|via=Google Books|isbn=9781558608382}}

Varshney serves as director of the Augmentarium Virtual and Augmented Reality Laboratory at the University of Maryland.{{cite web|url=http://augmentarium.umiacs.umd.edu/people|title=People}} He oversees research projects developing applications of virtual reality for atmospheric and oceanic sciences, astronomy, stem cell research, fluid dynamics simulations, surgical training, cybersecurity, and data visualization.{{cite web|url=http://augmentarium.umiacs.umd.edu/research/visualizing-big-data|title=Visualizing Big Data|date=9 October 2015}}

• IEEE Fellow{{cite web|url=https://www.cbcb.umd.edu/people/varshney|title=Amitabh Varshney - CBCB|website=www.cbcb.umd.edu}}
• IEEE Technical Achievement Award{{cite web|url=https://www.bizjournals.com/baltimore/news/2017/04/10/5-minutes-with-amitabh-varshney-director-of-the.html |title=Fiver minutes with Varshney |date=2017 |website=www.bizjournals.com}}
• IEEE Meritous Service Award{{cite web|url=http://vgtc.org/about-us/awards/service-award/ieee-meritorious-award-amitabh-varshney-2012|title=ieee meritorious award, amitabh varshney, 2012 - vgtc.org|website=vgtc.org}}
• National Science Foundation Career Award{{cite web|url=https://thedailyrecord.com/2018/01/24/amitabh-varshney-university-of-md/|title=Amitabh Varshney - University of Md.|first=Daily Record|last=Staff|date=24 January 2018}}

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Category:1966 births

Category:Living people

Category:IIT Delhi alumni

Category:University of North Carolina at Chapel Hill alumni

Category:Stony Brook University faculty

Category:University of Maryland, College Park faculty

Category:Fellows of the IEEE

Category:Indian emigrants to the United States

Category:American computer scientists

Category:Indian computer scientists