Research Publications

My research interest is in physically based simulation and 3D printable modeling.

Modeling, Evaluation and Optimization of Interlocking Shell Pieces

Miaojun Yao, Zhili Chen, Weiwei Xu and Huamin Wang
Computer Graphics Forum (Pacific Graphics 2017), vol 36, no. 7. 2017

In this paper, we present a computational system to design an interlocking structure of a partitioned shell model, which uses only male and female connectors to lock shell pieces in the assembled configuration. Given a mesh segmentation input, our system automatically finds an optimal installation plan specifying both the installation order and the installation directions of the pieces, and then builds the models of the shell pieces using optimized shell thickness and connector sizes. To find the optimal installation plan, we develop simulation-based and data-driven metrics, and we incorporate them into an optimal plan search algorithm with fast pruning and local optimization strategies. The whole system is automatic, except for the shape design of the key piece.

[Paper] [Video] [Publisher website]

Level-Set-Based Partitioning and Packing Optimization of a Printable Model

Miaojun Yao, Zhili Chen, Linjie Luo, Rui Wang and Huamin Wang
ACM Transactions on Graphics (SIGGRAPH Asia), vol. 34, no. 6. 2015.

In this paper, we present a systematic study on the partitioning and packing of 3D models under the multi-phase level set framework . Based on analysis of six metrics: stress load, surface details, interface area, packed size, printability, and assembling, we formulate level set methods to improve the qualities of the partitioning. These methods are integrated into an automatic system, which repetitively and locally optimizes the partitioning. Given the optimized partitioning result, we further provide a container structure modeling algorithm to facilitate the packing process of the printed pieces. Our experiment shows that the system can generate quality partitioning of various 3D models for space saving and fast production purposes.

[Paper] [Video] [Supplemental examples] [Publisher website]

Physics-Inspired Adaptive Fracture Refinement

Zhili Chen, Miaojun Yao, Renguo Feng and Huamin Wang
ACM Transactions on Graphics (SIGGRAPH), vol. 33, no. 4. 2014.

Physically based animation of detailed fracture effects is not only computationally expensive, but also difficult to implement due to numerical instability. In this paper, we propose a physics-inspired approach to enrich low-resolution fracture animation by realistic fracture details. Given a custom-designed material strength field, we adaptively refine a coarse fracture surface into a detailed one, based on a discrete gradient descent flow. Using the new fracture surface, we then generate a high-resolution fracture animation with details on both the fracture surface and the exterior surface. Our experiment shows that this approach is simple, fast, and friendly to user design and control. It can generate realistic fracture animations within a few seconds.

[Paper] [Video] [Slides] [Publisher website]

3D Printable Designs of Rigid and Deformable Models

Miaojun Yao
Ph.D. dissertation. The Ohio State University, Columbus, OH, USA. 2017.

In this thesis, we propose methods to optimize the design of rigid and deformable 3D models so as to improve 3D printing experiences. These methods are developed to achieve several goals: saving printing material and printing time, reducing packed space and building interlocking structure for a partitioned model, and designing an inverse elastic shape.

[Paper] [Defense link]

Projects

Projects accomplished during my previous work and study

New feature development for CAD software FormZ

AutoDesSys, Inc., Columbus, OH, Summers 2013, 2014

During my internship at AutoDesSys, Inc. at the summers of 2013 and 2014, I was engaged in developing new rendering features for the powerful CAD software FormZ. I implemented a variety of GLSL-based real-time rendering techniques, including multi-pass lighting, high quality shadow maps, screen space ambient occlusion, procedural texture and sketch shading.

[Gallery] [Product website]

Visual Interpretation with Three-Dimensional Annotations (VITA)

Computer Vision Lab, National University of Singapore, Aug. 2010 - Feb. 2011

VITA enables radiologists to communicate important image observations to other clinicians in the form of an auto-generated visual summary of imaging studies based on their own expert annotations using AIM-compatible DICOM viewers.

[Report]