CASSIE: Curve and Surface Sketching in Immersive Environments

Emilie Yu, Rahul Arora, Tibor Stanko, Jakob Andreas Bærentzen, Karan Singh, Adrien Bousseau

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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We present CASSIE, a conceptual modeling system in VR that leverages freehand mid-air sketching, and a novel 3D optimization framework to create connected curve network armatures, predictively surfaced using patches with C⁰ continuity. Our system provides a judicious balance of interactivity and automation, providing a homogeneous 3D drawing interface for a mix of freehand curves, curve networks, and surface patches. Our system encourages and aids users in drawing consistent networks of curves, easing the transition from freehand ideation to concept modeling. A comprehensive user study with professional designers as well as amateurs (N=12), and a diverse gallery of 3D models, show our armature and patch functionality to offer a user experience and expressivity on par with freehand ideation, while creating sophisticated concept models for downstream applications.
Original languageEnglish
Title of host publicationProceedings of 2021 CHI Conference on Human Factors in Computing
Number of pages14
PublisherAssociation for Computing Machinery
Publication date2021
Publication statusPublished - 2021
Event2021 CHI Conference on Human Factors in Computing - Virtual event, Yokohama, Japan
Duration: 8 May 202113 May 2021


Conference2021 CHI Conference on Human Factors in Computing
LocationVirtual event
Internet address


  • Curve networks
  • Immersive design
  • Ideation
  • Concept modeling

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