User:dllu

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This is the userpage of dllu. I work on robotics. I enjoy programming, 2D vector graphics, 3D graphics, physics, and photography.

2008—2014 Bachelor of Applied Science, Engineering Physics at the University of British Columbia.
2014—2016 Master of Science, Robotics at Carnegie Mellon University.
2016—2020 Software Engineer, 3D mapping at Ouster, a manufacturer of automotive lidar.
2020-2021 Staff Software Engineer, Tempus Ex Machina, a startup
2021-2023 Senior Software Engineer, Tesla
2023-present Software Engineer, Main Street Autonomy

I contribute mostly to articles related to computing, robotics, geometry, and various niche topics, although I sometimes contribute photos to other articles. Please feel free to add things to the articles listed below or post any questions to my talk page.

Articles I've contributed significantly to

Biham-Middleton-Levine traffic model (created)
Swinging Atwood's Machine (greatly expanded)
Monte Carlo localization (rewritten)
Point set registration (created)
Visibility polygon (expanded)
Phipps Conservatory and Botanical Gardens (expanded)

Smaller articles I've contributed to

Tair (lens) (created)

Featured Pictures

Pittsburgh

Organic Molecules Render

BML Traffic Model

A globally jammed phase with a traffic density of 60%.

A free flowing phase with a traffic density of 28%.

A periodic intermediate phase with a traffic density of 38%.

A disordered intermediate phase with a traffic density of 39%.

Maze generation

30x20 "backtracking" maze generation.

30x20 "prim" maze generation.

Arbitrary selection of other diagrams I've made

Coherent point drift

These were made with the reference implementation of coherent point drift by Myronenko and Song.

Orbits of the Swinging Atwood's Machine

The following family of diagrams are generated by my C++ code, which can be found at [1].

Monte Carlo localization

A robot using Monte Carlo localization to determine its position in a one-dimensional circular corridor containing three doors, using only a sensor that detects whether or not there is a door. The vertical grey bars at the bottom are the locations of the particles which represent the robot's current belief of its position. More particles clustered together means the robot is more likely to be there.

The following family of diagrams are generated by my C++ code, which can be found at [2].

1. Initialization.

2. Sensor update.

3. Resampling.

4. Motion update.

5. Sensor update.

6. Resampling.

7. Motion update.

8. Sensor update.

9. Resampling.

Photography

Current gear

Camera

Alkeria Necta N4K2-7C
Fujifilm GFX100S

Lenses

Fujifilm G-mount lenses 23mm f/4, 50mm f/3.5, 55mm f/1.7
Cosina Voigtländer APO-Lanthar 90mm f/3.5 SL (M42 mount) and 125mm f/2.5 (F mount)
Leica Apo-Telyt-R 180mm f/3.4 (R mount, adapted)
Sigma Art 70mm f/2.8 Macro (EF mount)
Cosina Voigtländer Apo Skopar 90mm f/2.8 (F mount)