Pixar a mis en ligne de nouvelles vidéos et publications sur les dernières avancées et recherches du studio, employées notamment sur le film d’animation En Avant (sorti en début d’année) et sur Soul, prévu pour la fin 2020.
We present a new technique to refit garments between characters of different shapes. Our approach is based on a novel iterative scheme that alternates relaxation and rebinding optimizations. In the relaxation step, we use affine-invariant coordinates in order to adapt the input 3D garment to the shape of a target character while minimizing mesh distortion. In the rebinding step, we reset the spacing between the refitted garment and the character body controlled by user-prescribed tightness values. Our method also supports additional constraints that encode the spatial and structural arrangement of multi-layers, seams, and fold-overs. We employed this refit tool in Pixar’s feature film Soul to transfer garment pieces between various digital characters.
Pose-space sculpting is a key component in character rigging workflows used by digital artists to create shape corrections that fire on top of deformation rigs. However, hand-crafting sculpts one pose at a time is notoriously laborious, involving multiple cleanup passes as well as repetitive manual edits. In this work, we present a suite of geometric tools that have significantly sped up the generation and reuse of production-quality sculpts in character rigs at Pixar.
These tools include a transfer technique that refits sculpts from one model to another, a surface reconstruction method that resolves entangled regions and a relaxation scheme that restores surface details. Importantly, our approach allows riggers to focus their time on making creative sculpt edits to meet stylistic goals, thus enabling quicker turnarounds and larger design changes with a reduced impact on production. We showcase the results generated by our tools with examples from Pixar’s feature films Onward and Soul.
Character rigs are procedural systems that deform a character’s shape driven by a set of rig-control variables. Film quality character rigs are highly complex and therefore computationally expensive and slow to evaluate. We present a machine learning method for approximating facial mesh deformations which reduces rig computations, increases longevity of characters without rig upkeep, and enables portability of proprietary rigs into a variety of external platforms. We perform qualitative and quantitative evaluations on hero characters across several feature films, exhibiting the speed and generalizability of our approach and demonstrating that our method out performs existing state-of-the-art work on deformation approximations for character faces.
The soul characters in Disney/Pixar’s Soul have a stylized appearance that sets them into a unique world, which introduced many new challenges. Everyone from the art department and character modelers and shaders to the technical directors and developers in the effects, lighting, and software groups collaborated to bring this new visual style to screen. The soul world is abstract and ethereal; this needed to be balanced with visual clarity and design appeal. As our character rigging and animation tools use rigged surfaces, a key challenge was presenting a new representation derived from this data that meets our visual goals. To achieve softness of volumetric form and dynamically changing linework, we built a system to procedurally generate this data in Houdini. Significant numerical computation was required to create this data at the fidelity required. We developed an automated system for managing this computation in a configurable way, while keeping data for downstream renders in sync with changes to character performances.
Rappelons pour finir que Soul devrait sortir le 25 novembre en France.
L’article En Avant, Soul : Pixar dévoile en vidéos ses derniers secrets techniques et artistiques est apparu en premier sur 3DVF.