Attended the presentation of a paper entitled Interactive Decal Compositing with Discrete Exponential Maps
Abstract
A method is described for texturing surfaces using decals, images placed on the surface using local parameterizations. Decal parameterizations are generated with a novel O(N logN) discrete approximation to the exponential map which requires only a single additional step in Dijkstra’s graph-distance algorithm. Decals are dynamically composited in an interface that addresses many limitations of previous work. Tools for image processing, deformation/feature-matching, and vector graphics are implemented using direct surface interaction. Exponential map decals can contain holes and can also be combined with conformal parameterization to reduce distortion. The exponential map approximation can be computed on any point set, including meshes and sampled implicit surfaces, and is relatively stable under resampling. The decals stick to the surface as it is interactively deformed, allowing the texture to be preserved even if the surface changes topology. These properties make exponential map decals a suitable approach for texturing animated implicit surfaces.
The full paper is available here
http://kf12.com/blogs/uploads/expmapsiggraph06.pdf
About the author: Ryan Michael Schmidt is currently an Master’s student in the Computer Science Department of the Unviersity of Calgary, being supervised by Dr. Brian Wyvill. He does research in computer graphics, particularly shape modeling with Implicit Surfaces and is due to commence a PhD at the University of Toronto (Summer 06)
Other Items
Possibly of equal interest were references to
ShapeShop
ShapeShop is a tool for creating 3D models using sketches. It incorporates much recent work in interactive implicit surface modeling, implicit sweep surfaces, and sketch-based modeling.
http://unknownroad.com/shapeshop/
There is a paper available ShapeShop: Sketch-Based Solid Modeling with BlobTrees which was presented at EuroGraphics 2005. Read it here
http://kf12.com/blogs/uploads/shapeshop_hires.pdf
and CrossY
CrossY is a crossing-based drawing application where instead of point-and-click “crossing” is used as an interaction method.
http://www.cs.umd.edu/hcil/crossy/
To trigger an action a target is crossed instead of being clicked on. Additional information is available in the following paper CrossY: A Crossing-Based Drawing Application
http://kf12.com/blogs/uploads/crossy_finale.pdf
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