Computer Animation and Virtual Worlds

Cover image for Vol. 28 Issue 3-4

Edited By: Nadia Magnenat Thalmann and Daniel Thalmann

Impact Factor: 0.424

ISI Journal Citation Reports © Ranking: 2016: 100/106 (Computer Science Software Engineering)

Online ISSN: 1546-427X

Featured

  • Animating synthetic dyadic conversations with variations based on context and agent attributes

    Animating synthetic dyadic conversations with variations based on context and agent attributes

    The marketplace scenario.

  • An embodied approach to arthropod animation

    An embodied approach to arthropod animation

    Select frames of a tarantula climbing onto a vertical wall. Green dots show the intersection bounds of the rudimentary sensing mechanism, used to judge the proximity and relative angle of objects in the creature's path.

  • A system for automatic animation of piano performances

    A system for automatic animation of piano performances

    Key poses of finger crossover while playing scales. The first row shows a key frame of the thumb crossing over the middle finger while playing the C-major scale, and the second row shows a key frame of the thumb crossing over the ring finger while playing the D-major scale, both from three perspectives. Note that the ring/middle finger firmly presses down the keys, the fingers avoid collisions with black keys in C-major, the wrist maintains a natural rotation, and the thumb is positioned well on the key to play it after crossing over.

  • Painterly rendering techniques: a state-of-the-art review of current approaches

    Painterly rendering techniques: a state-of-the-art review of current approaches

    A sample input source images (A and A ′ ) along with the target input images (B) with the result output (B ′ ) produced using techniques presented in .

  • Haptic collision handling for simulation of transnasal surgery

    Haptic collision handling for simulation of transnasal surgery

    The endoscope (green) inside the nasal cavity during simulation of transnasal surgery. In the larger image, some interior structures were made visible. The anatomy is complex and challenging for computation of tissue–tool interaction.

  • Animating synthetic dyadic conversations with variations based on context and agent attributes
  • An embodied approach to arthropod animation
  • A system for automatic animation of piano performances
  • Painterly rendering techniques: a state-of-the-art review of current approaches
  • Haptic collision handling for simulation of transnasal surgery

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Recently Published Articles

  1. Particle–mesh coupling in the interaction of fluid and deformable bodies with screen space refraction rendering

    Ka-Hou Chan, Wei Ke and Sio-Kei Im

    Version of Record online: 17 AUG 2017 | DOI: 10.1002/cav.1787

    Thumbnail image of graphical abstract

    This paper improves the particle neighbor search in SPH. We also propose a two-way coupling method for fluid and deformable bodies, where the particle–mesh interaction is obtained by the ray-traced collision detection method instead of the proxy/ghost particles. We are able to calculate the coupling forces based on the conservation of momentum and kinetic energy in the particle–mesh interaction. We use the SSFR for fluid, and on the basis of that, we introduce a screen space refraction rendering method.

  2. Position-based simulation of cloth wetting phenomena

    Xuqiang Shao, Wei Wu and Baoyi Wang

    Version of Record online: 14 AUG 2017 | DOI: 10.1002/cav.1788

    Thumbnail image of graphical abstract

    We present a nonlinear cloth wetting model based on unified adaptive PBD to simulate visually realistic cloth wetting phenomena, which takes into account the influence of gravity on water diffusion, wetting dynamics, water absorption, and water emission. The experimental results demonstrate that our novel wetting model provides an effective way to model stable and realistic cloth wetting phenomena using PBD.

  3. Heterogeneous volume deformation and animation authoring with density-aware moving least squares

    Soonhyeon Kwon, Younguk Kim, Kihyuk Kim and Sungkil Lee

    Version of Record online: 2 JUN 2017 | DOI: 10.1002/cav.1784

    Thumbnail image of graphical abstract

    This paper presents a novel heterogeneous volume deformation technique and an intuitive volume animation authoring framework. Our volume deformation extends the previous technique based on moving least squares with a density-awareweighting metric for data-driven importance control and efficient upsampling-based volume synthesis. For user interaction, we present an intuitive visual metaphor and interaction schemes to support effective spatiotemporal editing of volume deformation animation.

  4. Detail-preserving SPH fluid control with deformation constraints

    Gang Feng and Shiguang Liu

    Version of Record online: 23 MAY 2017 | DOI: 10.1002/cav.1781

    Thumbnail image of graphical abstract

    This paper proposed a novel SPH-based fluid deformation constraint method for deforming the fluid model between different target shapes smoothly. The new method includes two parts, namely the deformation of control model and fluid detail preserving with control force transfer. For the former, it can be used to deform the control models shape and then drive fluid particles moving. For the latter, fluid detail can be preserved by this mechanism when fluid deforms. The performance of our method is efficient enough for real-time simulation.

  5. Simulating collective transport of virtual ants

    Shihui Guo, Meili Wang, Gabriel Notman, Jian Chang, Jianjun Zhang and Minghong Liao

    Version of Record online: 21 MAY 2017 | DOI: 10.1002/cav.1779

    Thumbnail image of graphical abstract

    This paper proposes a stochastic probability model to model the decision-making procedure of group individuals and trains a neural network via reinforcement learning to represent the force policy. Our method is scalable to different numbers of individuals and is adaptable to users' input, including transport trajectory, object shape and external intervention etc. The simulations show that with the strategy of reposition, the ants can avoid deadlock scenarios during the task of collective transport.

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