Programming

A super serious use of differentiable rendering.

For years, society has been plagued by the lack of a conclusive answer to the question of how arbitrary things would wear jeans, if they wore jeans. This paper proposes a jalgorithm to determine the mathematically optimal configuration of pants on a silhouette, leveraging recent insights in the fields of computer vision and differentiable rendering.

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A library for efficiently drawing to a texture in p5 WebGL mode.

This gives you access to Framebuffers, which are WebGL-only and similar to a p5.Graphics, but faster, and includes depth information.

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Tired of doing math to get normals in your vertex shader? Same. Use this library to write your function once and generate derivatives automatically!

Sometimes, I want to displace mesh vertices in a vertex shader. After doing this, the normals of a surface should change. However, per-vertex normals don't automatically update! Manual updating of vertex normals requires you to take the derivative of your displacement function. This library automates that process so that it takes less time and is less prone to user error.

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Artist-drawn vector sketches use clusters of strokes to convey intended curves. StrokeStrip fits intended curves to such clusters by computing and utilizing a joint arc length parameterization of each cluster, producing clean lines consistent with viewer expectations.

We observe that viewers perceive stroke clusters as continuous, varying-width strips whose paths are described by the intended curves. An arc length parameterization of these strips defines a natural mapping from a strip to its path. We therefore recast the curve fitting problem as one of parameterizing the cluster strokes using a joint 1D parameterization that is the restriction of the natural arc length parameterization of this strip to the strokes in the cluster.

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We propose a differentiable formulation for soft shadows, allowing optimization of rendered images that include soft shadows with respect to scene parameters.

Our implementation enables applications such as optimizing a model with respect to its shadow. An example task motivating this work is the algorithmic generation of shadow art, in which a 3D shape produces different artist- specified shadow shapes when lit from different angles. An example of shadow art can be found on the cover of the book Gödel, Escher, Bach. Our goal is to find a reasonable tradeoff in this optimization task between visual quality and performance.

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We are interested in exploring how plausible it is to control creatures whose bodies contain muscle and no bone.

Given various elastic and deformable body plans, we would like to see what gaits emerge based on body shape and body material properties. Through experimentation, we comment on the effectiveness of genetic optimization over policy gradient optimization, and the expressive capability of local controllers with limited views of the world compared to single, comprehensive controllers.

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Given only primary motion skeletal animation, squash and stretch, overshoot, and jiggling are added automatically in real time.

Dynamic Kelvinlets model the time-varying elastic deformations of objects in response to input forces. Pixar uses them to add an extra level of realism to animations by introducing a secondary motion. We implement a system to automatically apply Dynamic Kelvinlet deformation to achieve visually plausible secondary motion at real-time simulation rates.

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A method of interactive procedural model searching, written for my fourth year research project.

We present a likelihood function for Sequential Monte Carlo sampling that lets artists draw guiding curves to control the output of generating grammars. This framework enables the high-level structure of models to be intuitively specified while allowing for sufficient variation in the low-level details. Our method can be computed at interactive rates to enable the short feedback loops required for exploratory design.

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A raytraced 3d renderer and short animation created with it for Waterloo's computer graphics course.

I used this project to implement graphics techniques such as photon mapped lighting, ambient occlusion, volumetric materials, constructive solid geometry, and inverse kinematics, along with sampling methods for inverse procedural modelling.

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2D procedural landscape generation.

I make use of Perlin noise for terrain generation and describe how to think about breaking complex shapes into recursive fractal-like structures to generate trees and houses.

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