About me.
I Like Cats.

Chi Cheng (Jerry) Hsu

Chi Cheng (Jerry) Hsu

University of Utah, Phd Candidate
Email: jerry060599@gmail.com

I graduated from Purdue double majoring in CS and Mathmatics in the spring of 2020.
I worked with computer graphics alot at Purdue and I'm now a Phd candidate in the School of Computing here at the University of Utah.
I am primarily interested in computer graphics and computer simulations.
I also like cats. Cats and computer graphics.

Protein VR Visualization

I worked under Prof. Gurav Chopra and the Envision Center visualizing protein molecules in VR. I started with a simple instanced renderer. From there I implemented billboarding to reduce the poly count; a compute-based atom culling algorithm to address fill rate bottlenecks, a fluid rendering inspired iso surface renderer to address Van Der waals shells, and octahedral imposters to address background rendering. I came up with the idea of running a linear regression on the atom positions to better align axis-aligned-bounding-boxes. I ended up with the ability to render 50k+ atoms complete with labels and bonds at the speed and fidelity VR applications require.

2D SPH fluid simulation with two-way coupled solids

A 2D SPH fluid simulation that leverages compute shaders in OpenGL to dramatically speed up frame times. The fluid particles are simulated with a spatial hashing algorithm synchronized with atomics. Integration was done with RK4. Solids are simulated as fluid particle clusters with particle impulses obtained through parallel reduction. Rendering is done through the use of a variable radius blur combined with a threshold function. On a RTX 2070 Super, the simulation can support up to half a million particles with ~5ms per time step (dt=8ms). The video on the left is playedback at realtime on my laptop with each scene containing ~100k particles.

C++ Game Engine

A 2D game engine written from scratch using OpenGL and GLFW. It has a build-in constraint based physics engine with a SPT broad phase. Similar to Unity, it was its own transform parenting system and an implementation of several GUI functions like: GUI event dispatches, anchored based UI scaling, instanced atlas text rendering and sliced sprite rendering.
At the Envision Center, we got a request for an interactive manual for engine disassembly from an engine manufacturer. The manual was a monster with hundreds of steps each with individual substeps, warnings, and descriptions. It was cumbersome to work with, difficult to organize, and untenable with the amount of states needed. A traditional keyframe animation system simply wouldn’t do. I spent a good couple of weeks just going over the design and in the end I came up with a system of annotated object hierarchies that could then be automatically compiled into traditional keyframe animations through simple graph traversal rules. My system took advantage of the hierarchical structure that CAD engineers typically maintained for engines while keeping everything neat, extensible, quick to modify, and easy to organize. Picture not provided due to IP concerns.

Playing around with particles

A somewhat early stage clone of an old esoteric simulation game called The Powder Toy using compute shaders.

I Like Cats.