Sunil Hadap

Principal Scientist

Creative Intelligence Lab, San Jose

In addition to his own research contribution, Sunil manages a small research group in Adobe’s Advanced Technology Labs (ATL).

His team focuses on the use of high-performance computing, available in desktops and notebooks (and tablets), to develop design paradigms and user experiences of the future.

Some specific topics that the group focuses on are:

  • Animation — Inverse Kinematics, Skinning, Articulated Rigid Bodies
  • Simulation — Fluid Simulation, Viscoelastic Lattice-Boltzmann Simulation for Oil Paint, Rigid Bodies, Deformable Models & Cloth, Physically Based Curve Design
  • Computational Imaging — PDEs for Image Enhancement, Super-resolution, Inverse Problems in Image Processing, Deblurring and Defocus, Depth from Defocus, Lighting Estimation, Intrinsic Images, Shape from Shading, Image Relighting
  • Multi-CPU and GPU computations, Parallel Algorithms, Scheduling and Cache Performance

The research included 9 research internships, 6 university collaborations, 3 PhD topics. Product groups have shown a keen interest in these technologies. Initiatives such as image relighting, intrinsic images and shape estimation push the boundaries of computational imaging and are poised to revolutionize aspects of digital photography and content creation.

Under his leadership, consultation & mentoring, and through my direct research contribution, he shipped the following flagship product features

  • Graphics Math Library (GML), a SSE optimized small vector-matrix-quaternion library, CS4, CS5
  • Inverse Kinematics and Skinning, Flash Pro CS4
  • Physics for Flash, Flash Pro CS5
  • Bristle Brush, realistic simulation of artist’s brush on canvas, Photoshop & Illustrator CS5

You must have wondered how they did the hair in “Shrek The Third”, the foliage in “Madagascar”, and recently hair in “How to Train Your Dragon”. Before joining Adobe, he worked at PDI/DreamWorks for four years (2003-2006) developing some cool special effects and character dynamics technologies — strand & hair dynamics, rigid bodies, particles and fluids.

He finished his PhD from MIRALab, University of Geneva in 2003.


  1. Organizer– “Strands and Hair: Modeling, Animation, and Rendering”, course 33, SIGGRAPH 2007
  2. Organizer– “Introduction to Articulated Rigid Body Dynamics”, course 2, SIGGRAPH 2005
  3. Organizer– “Collision Detection and Proximity Queries”, course 14, SIGGRAPH 2004
  4. Presenter– “Photorealistic Hair Modeling, Animation, And Rendering”, course 9, SIGGRAPH 2004
  5. Presenter– “Photorealistic Hair Modeling, Animation, and Rendering”, course 34, SIGGRAPH 2003


  1. Sunil Hadap, “Hair Simulation”, PhD Dissertation, 2003
  2. Sunil Hadap, “Design of Robotics Teaching Aid”, Master of Design Thesis, 1995
  3. Sunil Hadap, “Design of Weather Data Collection Platform”, Master of Design Thesis, 1995
  4. Sunil Hadap, “Multi-block Grid Generation Toolkit”, Bachelor of Technology Thesis, 1993

Invited Talks

  1. “DAEs in Solution of Stiff Articulated Body Dynamics”, Honda Research, USA, 2004
  2. “Games Development”, Intel’s Developer Conference, India, 1997

My Publications

MT-VAE: Learning Motion Transformations to Generate Multimodal Human Dynamics

Yan, X., Rastogi, A., Villegas, R., Sunkavalli, K., Shechtman, E., Hadap, S., Yumer, E., Lee, H. (Sep. 10, 2018)
European Conference on Computer Vision (ECCV'18)

Deep Image-based Relighting using Optimal Sparse Samples

Xu, Z., Sunkavalli, K., Hadap, S., Ramamoorthi, R. (Aug. 12, 2018)
ACM Transactions on Graphics (Proc. SIGGRAPH) 2018

A Perceptual Measure for Deep Single Image Camera Calibration

Hold-Geoffroy, Y., Sunkavalli, K., Eisenmann, J., Fisher, M., Gambaretto, E., Hadap, S., Lalonde, J. (Jun. 18, 2018)
IEEE Conference on Computer Vision and Pattern Recognition (CVPR) 2018

Illuminant Spectra-based Source Separation Using Flash Photography

Hui, Z., Sunkavalli, K., Hadap, S., Sankaranarayanan, A. (Jun. 18, 2018)
IEEE Conference on Computer Vision and Pattern Recognition (CVPR) 2018 (Oral)

Reflectance Capture using Univariate Sampling of BRDFs

Hui, Z., Sunkavalli, K., Lee, J., Hadap, S., Sankaranarayanan, A. (Oct. 22, 2017)
International Conference on Computer Vision 2017

Portrait Lighting Transfer using a Mass Transport Approach

Shu, Z., Hadap, S., Shechtman, E., Sunkavalli, K., Paris, S., Samaras, D. (Jul. 29, 2017)
ACM Transactions on Graphics (TOG'17, presented at SIGGRAPH'17)

Neural Face Editing with Intrinsic Image Disentangling

Shu, Z., Yumer, E., Hadap, S., Sunkavalli, K., Shechtman, E., Samaras, D. (Jul. 21, 2017)
(Oral) IEEE Conference on Computer Vision and Pattern Recognition (CVPR'17)

Deep Outdoor Illumination Estimation

Hold-Geoffroy, Y., Sunkavalli, K., Hadap, S., Gambaretto, E., Lalonde, J. (Jul. 21, 2017)
IEEE Conference on Computer Vision and Pattern Recognition (CVPR) 2017 (Oral)

Shading-aware Multi-view Stereo

Langguth, F., Sunkavalli, K., Hadap, S., Goesele, M. (Oct. 8, 2016)
European Conference on Computer Vision 2016

EyeOpener: Editing Eyes in the Wild

Shu, Z., Shechtman, E., Samaras, D., Hadap, S. (Sep. 1, 2016)
ACM Transactions on Graphics (TOG'16), Volume 36, Issue 1

White Balance under Mixed Illumination using Flash Photography

Hui, Z., Sankaranarayanan, A., Sunkavalli, K., Hadap, S. (May. 13, 2016)
International Conference on Computational Photography (ICCP) 2016

Automatic scene inference for 3D object compositing

Karsch, K., Sunkavalli, K., Hadap, S., Carr, N., Jin, H., Fonte, R., Sittig, M., Forsyth, D. (Apr. 1, 2014)
ACM Transactions on Graphics

Specular Reflection Separation using Dark Channel Priors

Kim, H., Jin, H., Hadap, S., Kweon, I. (Jun. 25, 2013)
Proceedings of IEEE conference on Computer Vision and Pattern Recognition (CVPR), June 2013.

Non-photorealistic, Depth-based Image Editing

Lopez-Moreno, J., Jimenez, J., Hadap, S., Anjyo, K., Reinhard, E., Gutierrez, D. (Jan. 31, 2011)
Computer and Graphics, Volume 35, Issue 1, February, 2011

Bristle Tip and Mixer Brush

Hadap, S., DiVerdi, S., Krishnaswamy, A. (Jan. 31, 2010)
Poster, NPAR 2010

Compositing Images through Light Source Detection

Lopez-Moreno, J., Hadap, S., Reinhard, E., Gutierrez, D. (Jan. 31, 2010)
Computers and Graphics, Volume 34, Issue 6, December, 2010

Industrial-Strength Painting with a Virtual Bristle Brush

DiVerdi, S., Krishnaswamy, A., Hadap, S. (Jan. 31, 2010)
In Proc. of the Symposium on Virtual Reality Software and Technology , 119-126

Stylized Depiction of Images Based on Depth Perception

Lopez-Moreno, J., Jimenez, J., Hadap, S., Reinhard, E., Anjyo, K., Gutierrez, D. (Jan. 31, 2010)
Best Paper Award Non-photorealistic Animation and Rendering (NPAR), 2010

Industrial-Strength Painting with a Virtual Bristle Brush

DiVerdi, S., Krishnaswamy, A., Hadap, S. (Jan. 30, 2010)
VRST 2010

Regularized Depth from Defocus

Namboodiri, V., Chaudhuri, S., Hadap, S. (Jan. 31, 2008)
ICIP 2008

Oriented Strands – dynamics of stiff multi-body system

Hadap, S. (Jan. 31, 2006)
ACM SIGGRAPH / Eurographics Symposium on Computer Animation , 2006

Rendering Photo-realistic Hair using Graphics Hardware

Hadap, S., Magnenat-Thalmann, N. (Jan. 31, 2003)
Technical Report, 2003


Hadap, S., Magnenat-Thalmann, N. (Aug. 31, 2001)
Computer Graphics Foru m, Volume 20, Issue 3, Eurographics 2001 Proceedings, Manchester, United Kingdom, September 2001

State of the Art in Hair Simulation

Magnenat-Thalmann, N., Hadap, S., Kalra, P. (Jun. 27, 2000)
International Workshop on Human Modeling and Animation , Seoul, Korea, June 28--29, 2000

Interactive Hair Styler based on Fluid Flow

Hadap, S., Magnenat-Thalmann, N. (Jan. 31, 2000)
Eurographics Workshop on Computer Animation and Simulation'2000 , Interlaken 2000

Animating Wrinkles on Clothes

Hadap, S., Bangarter, E., Volino, P., Magnenat-Thalmann, N. (Jan. 31, 1999)
IEEE Visualization '99 , San Francisco 1999

MultiBlock Grid Generation for Structured Grids

Mukherjee, S., Apte, M., Isaacs, A., Hadap, S., Shevare, D. (Mar. 31, 1996)
5th International Conference on Numerical Grid Generation for Computational Fluid Simulation , April, 1996