UCF CAP 5937 - ShapePalettes - Interactive Normal Transfer via Sketching

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ShapePalettes: Interactive Normal Transfer via SketchingTai-Pang Wu, Chi-Keung Tang, Michael S. Brown, Heung-Yeung ShumACM Transactions, June 2007Review by Michael HaysOverview• Provide a rapid way to create 3d figures using a 2d interface.– We have seen glyph based construction – Sketch ‘96– We have seen complete free form – Teddy ’99• Where are they now? FiberMesh/Plushie• Easily add normal information to a 2D sketch by transferring normals from example 3D figures– Rendering 3D images from normal information came from Kovesi’s 2005 paper on “Shapelets”.Overview (cont)• People have a good intuition for implied 3d information in a 2d sceneDrawing the Silhouette• The silhouette defines the zero line of the figure. No height will be applied at this point.• The normals of a silhouetteare perpendicular to the2D sketch• No need for a palette yetUsing the Palette to Imbue Normals• Transfer pallet by marking up our 2D figure and then drawing a corresponding mark on a shape from the palette.What is being transferred?• 3D Normals are copied onto the 2D imageReturning to our Silhouette• More Interesting PalettesInteresting Shapes• Ridges• ValleysPatches• Morph a set of points to communicate complex 3D textureOverall Framework• Sparse normal map contains only the lines drawn by the user• Must be converted to a dense normal map so that it can be turned into a 3D surface.ExamplesStrengths• This approach seems very intuitive– Pen only works in a couple of ways– Almost completely modeless interface• Seems simple to implement– The challenge seems to be computing the interpolated, dense, normals from the sparse normals, and the math is all laid out in the paper.Limitations (read: Paper Ideas)• The authors were using menus and buttons to control function.• Height field is arbitrary• No ability to work with occluded surfaces• Interpolation of lines results in a “soft” model• Cannot handle perspectives in the 2D imageKnow thy enemy• The strength of this interface is that it is easy and intuitive – can it be used for real work?• At the same convention, another surface reconstruction paper was presented that seems to deal with the occlusion and detail problem – and is almost completely automated (supervised).References• Wu, Tai-Pang, Chi-Keung Tang, Michael Brown, Heung-Yeung Shum. “ShapePalettes: Interactive Normal Transfer via Sketching.” ACM Transactions, July 2007. Article 44.• Andrei Sharf, Thomas Lewiner, Gil Shklarski, Sivan Toledo, Daniel Cohen-Or. “Interactive topology-aware surface reconstruction.” ACM Transactions, July 2007. Article


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UCF CAP 5937 - ShapePalettes - Interactive Normal Transfer via Sketching

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