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Implicit Blending Revisited

Adrien Bernhardt 1 Loic Barthe 2 Marie-Paule Cani 1 Bryan Wyvill 3 
1 EVASION - Virtual environments for animation and image synthesis of natural objects
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, Grenoble INP - Institut polytechnique de Grenoble - Grenoble Institute of Technology
2 IRIT-VORTEX - Visual Objects from Reality To Expression
IRIT - Institut de recherche en informatique de Toulouse
Abstract : Blending is both the strength and the weakness of functionally based implicit surfaces (such as F-reps or softobjects). While it gives them the unique ability to smoothly merge into a single, arbitrary shape, it makes implicit modelling hard to control since implicit surfaces blend at a distance, in a way that heavily depends on the slope of the field functions that define them. This paper presents a novel, generic solution to blending of functionally-based implicit surfaces: the insight is that to be intuitive and easy to control, blends should be located where two objects overlap, while enabling other parts of the objects to come as close to each other as desired without being deformed. Our solution relies on automatically defined blending regions around the intersection curves between two objects. Outside of these volumes, a clean union of the objects is computed thanks to a new operator that guarantees the smoothness of the resulting field function; meanwhile, a smooth blend is generated inside the blending regions. Parameters can automatically be tuned in order to prevent small objects from blurring out when blended into larger ones, and to generate a progressive blend when two animated objects come in contact.
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Submitted on : Wednesday, January 27, 2010 - 11:18:01 AM
Last modification on : Monday, July 4, 2022 - 9:51:23 AM
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Adrien Bernhardt, Loic Barthe, Marie-Paule Cani, Bryan Wyvill. Implicit Blending Revisited. Computer Graphics Forum, 2010, 29 (2), pp.367-375. ⟨10.1111/j.1467-8659.2009.01606.x⟩. ⟨inria-00450722v2⟩



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