Research - Cem Yuksel

Studying breaking waves with Dr. Donald House during Pacific Graphics '07 Conference (Maui, Hawaii). Things you gotta do in the name of research!

Resourses

Hair Model Files The hair models I used for my earlier research projects have been online for a long time. They have been used by many researchers for various hair-related computer graphics research projects. You can download and use them as well.

Yarn-level Cloth Model Files You can download and use the yarn-level cloth models I prepared for your personal or research projects.

Research Projects

Alpha Distribution

Cem Yuksel

Alpha distribution fixes the problems of alpha testing by properly handling semi-transparent textures. One important advantage of alpha distribution is that it requires no modification to fragment shader code for alpha testing.

Hardware Ray Tracing

The Hardware Ray Tracing research project explores new algorithms and new hardware architectures for highly realistic rendering with ray tracing that would provide high performance and consume significantly less power than current GPU growth trends.

Lighting Grid Hierarchy

Can Yuksel, Cem Yuksel

Lighting grid hierarchy as a solution to the many-lights problem that is temporally stable and provides superior performance by precomputing shadows. For rendering explosions, we convert the volume lighting data into many point lights.

Mesh Colors

Cem Yuksel, John Keyser, Donald H. House

Mesh colors provide an alternative to texture mapping. Colors are directly associated with the 3D model avoiding all problems caused by mapping. It is a perfect structure for applications like 3D painting and storing data on meshes (such as baking ambient occlusion).

Hair Mesh Simulation

Kui Wu, Cem Yuksel

Leveraging existing simulation models for sheet-based cloth simulation, we introduce a volumetric force model for incorporating hair interactions inside the hair mesh volume, providing robust hair simulation at real-time frame rates.

Sample Elimination for Poisson Disk Sets

Cem Yuksel

Sample Elimination is a different approach to generating Poisson Disk sample sets. The new Weighted Sample Elimination method is easy to implement, computationally efficient, works in any domain, scales well to high dimensions, and allows progressive (adaptive) sampling.

Stitch Meshes

Cem Yuksel, Jonathan M. Kaldor, Doug L. James, Steve Marschner

Stitch meshes provide a practical way of modeling knitted garments for yarn-level simulation. We begin with a low-poly model surface and produce the final results through physically based yarn-level relaxation.

Hair Meshes

Cem Yuksel, Scott Schaefer, John Keyser

Hair meshes bring hair modeling close to modeling polygonal surfaces, providing artists direct control over the shape of the hair model and giving them the ability to model the exact hair shape they desire. This method is used in Hair Farm plugin for 3ds Max.

Parameterization of Catmull-Rom Curves

Cem Yuksel, Scott Schaefer, John Keyser

The behavior of Catmull-Rom curves heavily depends on the choice of parameter values at the control points. We analyze a class of parameterizations and show that curves with centripetal parameterization contain properties that no other curves in this family possess.

Real-time Caustics from Height Fields

Cem Yuksel, John Keyser

This project is about a two-pass algorithm for caustics computation that is extremely fast and produces high quality results. This algorithm is targeted for commonly used height field representations of water and a planar caustic-receiving surface.

Dual Scattering for Hair

Arno Zinke, Cem Yuksel, Andreas Weber, John Keyser

Dual scattering offers an extremely fast approximation of multiple scattering in hair. Its simplicity allows GPU implementation for real-time hair rendering and it requires no parameter tuning to achieve realistic results with arbitrary lighting conditions.

Wave Particles

Cem Yuksel, Donald H. House, John Keyser

This is a new method for the real-time simulation of fluid surface waves and their interactions with floating objects. The method is based on the new concept of wave particles, which offers a simple, fast, and unconditionally stable approach to wave simulation.

Deep Opacity Maps

Cem Yuksel, John Keyser

This is a new method for computing shadows from semi-transparent objects like hair suitable for real-time rendering. Extending the concept of opacity shadow maps, deep shadow maps method significantly improves the quality and the speed of shadow computation.

Hair Rendering with Global Illumination

Cem Yuksel, Ergun Akleman, John Keyser

Both hair rendering and global illumination are known to be computationally expensive In this project we explore possible solutions for efficiently rendering hair with global illumination to make it affordable for computer graphics applications.

Gradient Space Projection

Cem Yuksel

This is a method for handling projections onto the hemisphere by practically converting the hemisphere to an infinite plane. The motivation of this project was to replace Monte Carlo ray tracing used in gathering indirect illumination by a projection based alternative.

Publication List

Daqi Lin, Cem Yuksel, Real-Time Rendering with Lighting Grid Hierarchy, Proc. ACM Comput. Graph. Interact. Tech. (Proceedings of I3D 2019), 2, 1, 2019, to appear

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