To appear in ACM Transactions on Graphics, 34, 4 (SIGGRAPH 2015)
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Our open source implementation VPaint is available at www.vpaint.org
The successors of VPaint, VGC Illustration and VGC Animation, are being developed at VGC
Vector Graphics Animation with Time-Varying Topology
ACM Transactions of Graphics, 34, 4 (SIGGRAPH 2015)
We introduce the Vector Animation Complex (VAC), a novel data structure for vector graphics animation, designed to support the modeling of time-continuous topological events. This allows features of a connected drawing to merge, split, appear, or disappear at desired times via keyframes that introduce the desired topological change. Because the resulting space-time complex directly captures the time-varying topological structure, features are readily edited in both space and time in a way that reflects the intent of the drawing. A formal description of the data structure is provided, along with topological and geometric invariants. We illustrate our modeling paradigm with experimental results on various examples.