N-ary implicit blends with topology control - Archive ouverte HAL Access content directly
Journal Articles Computers and Graphics Year : 2015

N-ary implicit blends with topology control

(1) , (1) , (1, 2)
1
2

Abstract

Constructive implicit surfaces are attractive for modeling and animation because they seamlessly handle shapes with complex and dynamic topology. However, the way they merge shapes is difficult to control. This paper introduces a solution: an improved blend operator that provides control over how topology changes are handled. It is based on a correction applied to the standard blending operator: the sum. Building on summation preserves the n-ary nature of the blend, providing the simplicity of arbitrary (e.g. flat) construction trees and segmentation invariance. The correction is based on projection to a reference case in the variation-space defined by the field and the norm of its gradient. It provides a single parameter, allowing for tuning behavior to achieve effects ranging from avoiding topological combination, through merging only during overlap, to merging at a distance. Dynamic adjustment of the parameter allows for context-dependent effects. Applications range from skeleton-based modeling, where shapes keep the topology of their skeleton, to objects that change topology during animation, with controllable merging. We illustrate the latter with Manga-style hair, where merging depends on the angle between hair wisps.

Keywords

Vignette du fichier
0_Topology.png (584.87 Ko) Télécharger le fichier Fichier principal
Vignette du fichier
SMI_dynamicTopology.pdf (10.77 Mo) Télécharger le fichier
Vignette du fichier
ComparaisonN.png (520.13 Ko) Télécharger le fichier
Vignette du fichier
HairWithZoom.png (700.61 Ko) Télécharger le fichier
Vignette du fichier
SMI_COMPO_V15_HD_.mp4 (18.19 Mo) Télécharger le fichier
Vignette du fichier
teaser_NEW.png (436.43 Ko) Télécharger le fichier
Format : Figure, Image
Origin : Files produced by the author(s)
Format : Figure, Image
Format : Figure, Image
Format : Video
Format : Figure, Image
Loading...

Dates and versions

hal-01073088 , version 1 (08-10-2014)

Identifiers

Cite

Cédric Zanni, Marie-Paule Cani, Michael Gleicher. N-ary implicit blends with topology control. Computers and Graphics, 2015, 46, pp.1-13. ⟨10.1016/j.cag.2014.09.012⟩. ⟨hal-01073088⟩
407 View
476 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More