Contact Preserving Shape Transfer For Rigging-Free Motion Retargeting

Jean Basset 1 Stefanie Wuhrer 1 Edmond Boyer 1 Franck Multon 2, 3
1 MORPHEO - Capture and Analysis of Shapes in Motion
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, INPG - Institut National Polytechnique de Grenoble
3 MIMETIC - Analysis-Synthesis Approach for Virtual Human Simulation
UR2 - Université de Rennes 2, Inria Rennes – Bretagne Atlantique , IRISA-D6 - MEDIA ET INTERACTIONS
Abstract : Retargeting a motion from a source to a target character is an important problem in computer animation, as it allows to reuse existing rigged databases or transfer motion capture to virtual characters. Surface based pose transfer is a promising approach to avoid the trial-and-error process when controlling the joint angles. The main contribution of this paper is to investigate whether shape transfer instead of pose transfer would better preserve the original contextual meaning of the source pose. To this end, we propose an optimization-based method to deform the source shape+pose using three main energy functions: similarity to the target shape, body part volume preservation, and collision management (preserve existing contacts and prevent penetrations). The results show that our method is able to retarget complex poses, including several contacts, to very different morphologies. In particular, we introduce new contacts that are linked to the change in morphology, and which would be difficult to obtain with previous works based on pose transfer that aim at distance preservation between body parts. These preliminary results are encouraging and open several perspectives, such as decreasing computation time, and better understanding how to model pose and shape constraints.
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Submitted on : Monday, September 30, 2019 - 11:19:55 AM
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Jean Basset, Stefanie Wuhrer, Edmond Boyer, Franck Multon. Contact Preserving Shape Transfer For Rigging-Free Motion Retargeting. MIG 2019 - ACM SIGGRAPH Conference Motion Interaction and Games, Oct 2019, Newcastle Upon Tyne, United Kingdom. pp.1-10, ⟨10.1145/3359566.3360075⟩. ⟨hal-02293308v2⟩

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