Replaceable Substructures for Efficient Part-Based Modeling

Han Liu (1) , Ulysse Vimont (2) , Michael Wand (3) , Marie-Paule Cani (2) , Stefanie Hahmann (2) , Damien Rohmer (4, 2) , Niloy J. Mitra (5, 1)

1 KAUST - King Abdullah University of Science and Technology [Saudi Arabia]
2 IMAGINE - Intuitive Modeling and Animation for Interactive Graphics & Narrative Environments
3 Universiteit Utrecht / Utrecht University [Utrecht]
4 CPE - École Supérieure de Chimie Physique Électronique de Lyon
5 UCL-CS - Department Computer Science [London]

A popular mode of shape synthesis involves mixing and matching parts from different objects to form a coherent whole. The key challenge is to efficiently synthesize shape variations that are plausible, both locally and globally. A major obstacle is to assemble the objects with local consistency, i.e., all the connections between parts are valid with no dangling open connections. The combinatorial complexity of this problem limits existing methods in geometric and/or topological variations of the synthesized models. In this work, we introduce replaceable substructures as arrangements of parts that can be interchanged while ensuring boundary consistency. The consistency information is extracted from part labels and connections in the original source models. We present a polynomial time algorithm that discovers such substructures by working on a dual of the original shape graph that encodes inter-part connectivity. We demonstrate the algorithm on a range of test examples producing plausible shape variations, both from a geometric and from a topological viewpoint.

Domaines: Synthèse d'image et réalité virtuelle [cs.GR]

Han Liu, Ulysse Vimont, Michael Wand, Marie-Paule Cani, Stefanie Hahmann, et al.. Replaceable Substructures for Efficient Part-Based Modeling. Computer Graphics Forum, 2015, 34 (2), pp.503 - 513. ⟨10.1111/cgf.12579⟩. ⟨hal-01134783v2⟩