UCF CAP 5937 - Sketch-based Modeling with Few Strokes

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1Sketch-based Modeling with Few StrokesCherlin, J.J., Samavati, F., Sousa, M.C., Jorge, J.A.Proceedings of the 21stSpring Conference on Computer GraphicsPresented by Andy TjongIntro A sketch-based system for the interactive modeling of a variety of free-form 3D objects using a few strokes. Uses two parametric surfaces for creation of models Uses orthogonal deformation and cross sectional oversketching for editing.2Traditional hand-drawn techniquesPrevious work Three categories{ Extrusion-based system like Sketch and Quick-Sketch{ Blob editing systems like Teddy and BlobMaker{ Reconstruction-based systems which are based on templates This system can generate a large variety of 3D parametric surface objects with curved and creased features with few strokes and simple interactions.3The details of the system Stroke Capture{ Converted into parametric form{ Use a B-Spline curve Reverse Chaikin Subdivision Creation phase Editing phaseThe details of the system Stroke Capture Creation phase{ Rotational Blending Surface{ Cross Sectional Blending Surfaces Editing phase4Rotational blend surfacesRotational blend surfaces5The details of the system Stroke Capture Creation phase{ Rotational Blending Surface{ Cross Sectional Blending Surfaces Based on the scribble method A curve used for creating the surface Editing phaseCross Sectional Blending Surfaces6Cross Sectional Blending SurfacesThe details of the system Stroke Capture Creation phase Editing phase{ Orthogonal Deformation Stroke for editing models in the third dimension7Orthogonal Deformation StrokeThe details of the system Stroke Capture Creation phase Editing phase{ Orthogonal Deformation Stroke for editing models in the third dimension{ Cross Sectional Oversketch8Cross Sectional OversketchResults9Pros & Cons Pros{ Use only a couple of strokes.{ Easily create sharp edges and creases. Cons{ No user study, not sure if the system is really intuitive.{ Looks like translating and rotating is not so easy since the assembly takes a long time.{ Cannot rotate and twist objects since deformation only happens in the z


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UCF CAP 5937 - Sketch-based Modeling with Few Strokes

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