NDLI: Shape transformation using variational implicit functions ( SIGGRAPH '05 )

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Shape transformation using variational implicit functions ( SIGGRAPH '05 )

Content Provider	ACM Digital Library
Author	Turk, Greg O'Brien, James F.
Abstract	Traditionally, shape transformation using implicit functions is performed in two distinct steps: 1) creating two implicit functions, and 2) interpolating between these two functions. We present a new shape transformation method that combines these two tasks into a single step. We create a transformation between two N-dimensional objects by casting this as a scattered data interpolation problem in N + 1 dimensions. For the case of 2D shapes, we place all of our data constraints within two planes, one for each shape. These planes are placed parallel to one another in 3D. Zero-valued constraints specify the locations of shape boundaries and positive-valued constraints are placed along the normal direction in towards the center of the shape. We then invoke a variational interpolation technique (the 3D generalization of thin-plate interpolation), and this yields a single implicit function in 3D. Intermediate shapes are simply the zero-valued contours of 2D slices through this 3D function. Shape transformation between 3D shapes can be performed similarly by solving a 4D interpolation problem. To our knowledge, ours is the first shape transformation method to unify the tasks of implicit function creation and interpolation. The transformations produced by this method appear smooth and natural, even between objects of differing topologies. If desired, one or more additional shapes may be introduced that influence the intermediate shapes in a sequence. Our method can also reconstruct surfaces from multiple slices that are not restricted to being parallel to one another.
File Format	PDF
DOI	10.1145/1198555.1198639
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2005-07-31
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Implicit surfaces Contour interpolation Shape morphing Thin-plate techniques Shape transformation
Content Type	Text
Resource Type	Article

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