SBM06: Sketch Based Interfaces and Modeling 2006
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Browsing SBM06: Sketch Based Interfaces and Modeling 2006 by Subject "Categories and Subject Descriptors (according to ACM CCS): I.3.5 [Computer Graphics]: Computational Geometry and Object Modeling: Modeling packages"
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Item Modeling Plant Variations through 3D Interactive Sketches(The Eurographics Association, 2006) Streit, Lisa; Lapides, Paul; Sousa, Mario Costa; Sharlin, Ehud; Thomas Stahovich and Mario Costa SousaModeling realistic looking plants is still a complex problem requiring specification of plant structure, geometry and surface characteristics. Modeling a collection of plants is more problematic especially since each plant is slightly different. Altering the shape of branches and stems is one of the most dramatic and natural methods of creating differing instances of the same plant type. We present a sketch-based interface for modeling plant variations through specification of branch and stem shape. Our system is based on interaction with the 3D Tractus: a new physical interface we developed to support direct 3D sketching. The 3D strokes from the 3D Tractus are used as input to a biologically-based modeling method that mimics natural growth variation factors of real plants.Item Transformation Strokes(The Eurographics Association, 2006) Severn, Aaron; Samavati, Faramarz; Sousa, Mario Costa; Thomas Stahovich and Mario Costa SousaIn this paper, we present a sketch-based technique for specifying transformations for general models by means of a single stroke, offering a more streamlined form of user interaction. The shape of the stroke is interpreted to allow composition of translation, rotation and scaling. We extract two main directions from the input stroke using Principle Component Analysis and use them to obtain an appropriate transformation for the model. Our method helps to have a more natural and faster way of assembling 3D structures. It is general and does not depend on specific knowledge about the type of models. As such, it can fit in the majority of graphics systems or modelling techniques.