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Sketching Manipulators for Localized Blendshape Editing
The journal account of localized sketch driven blendshape editing: geodesic circles bound each edit and freehand strokes stand in for the weight sliders.
Abstract
We introduce a method that localizes the direct manipulation of blendshape models for facial animation with a customized sketch-based interface. Direct manipulation methods address the problem of the cumbersome weight editing process of traditional tools with a practical pin-and-drag operation directly on the 3D facial models. However, most direct manipulation methods have a global deformation impact, which leads to unintuitive and unexpected results. To this end, we propose a new way to localize the theory of direct manipulation using geodesic circles for confining the edits to the local geometry. Inspired by artists' brush painting on canvas, we additionally introduce a sketch-based interface as an application that provides direct manipulation and produces expressive facial poses efficiently and intuitively. Our method allows artists to simply sketch directly onto the 3D facial model and automatically produces the expeditious manipulation until the desired facial pose is obtained. We show that localized blendshape direct manipulation has the potential to reduce the time-consuming blendshape editing process to an easy freehand stroke drawing. Finally, we present a wide range of facial poses on various models that are created rapidly using our method.
How to read this
- Category
- Journal extension of the localized sketch-driven blendshape editing work.
- Contributions
- A full account of localizing direct manipulation with geodesic circles to confine edits to local geometry.
- A sketch-based interface where the artist draws directly on the 3D face and the manipulation follows the stroke.
- The argument that a time-consuming weight editing process can be reduced to freehand stroke drawing.
- A wide range of facial poses on various models, produced rapidly with the method.
- Context
- The journal version of cetinaslan-direct-manipulation-2018, and through it the endpoint of a line that starts with lewis-direct-manipulation-blendshapes-2010 for the manipulation and with miranda-sketch-express-2011 for the sketching. If you only read one paper from Cetinaslan's interface thread, this is the one.Builds on: Direct manipulation of blendshapes using a sketch-based interface
- Correctness
- Same caveats as the conference version, now with more space to defend them. The geodesic radius remains an approximation of influence, and the evaluation remains a demonstration rather than a controlled comparison against slider workflows. The strength of the paper is breadth of examples, not measurement, so judge it on whether the poses shown resemble the poses you need.
- Clarity
- Good journal writing. The relationship to the earlier papers is stated plainly and the method section is self contained.
- How to read it
- First pass: abstract, the interface figures, the pose gallery. Second pass: the localization derivation and the stroke to manipulation mapping. Third pass: worth it if you are building a facial posing tool, since this is the most complete description in the line.
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