• Issue

    Computer Graphics Forum: Volume 40, Issue 6

    1-515
    September 2021

Issue Information

Free Access

Issue Information

  • Pages: 1-4
  • First Published: 29 September 2021

Articles

Open Access

Visualizing and Interacting with Geospatial Networks: A Survey and Design Space

  • Pages: 5-33
  • First Published: 09 April 2021
Visualizing and Interacting with Geospatial Networks: A Survey and Design Space

This paper surveys visualization and interaction techniques for geospatial networks from a total of 95 papers.

Parametric Skeletons with Reduced Soft-Tissue Deformations

  • Pages: 34-46
  • First Published: 02 February 2021
Parametric Skeletons with Reduced Soft-Tissue Deformations

We present a method to augment parametric skeletal models with subspace soft-tissue deformations.

Action Unit Driven Facial Expression Synthesis from a Single Image with Patch Attentive GAN

  • Pages: 47-61
  • First Published: 17 March 2021
Action Unit Driven Facial Expression Synthesis from a Single Image with Patch Attentive GAN

Recent advances in generative adversarial networks (GANs) have shown tremendous success for facial expression generation tasks.

Fluid Reconstruction and Editing from a Monocular Video based on the SPH Model with External Force Guidance

  • Pages: 62-76
  • First Published: 05 March 2021
Fluid Reconstruction and Editing from a Monocular Video based on the SPH Model with External Force Guidance

We specifically present a general method for monocular fluid videos to reconstruct and edit 3D fluid volume.

Open Access

Linear Polarization Demosaicking for Monochrome and Colour Polarization Focal Plane Arrays

  • Pages: 77-89
  • First Published: 02 March 2021
Linear Polarization Demosaicking for Monochrome and Colour Polarization Focal Plane Arrays

Division-of-focal-plane (DoFP) polarization image sensors allow for snapshot imaging of linear polarization effects with inexpensive and straightforward setups.

Transfer Deep Learning for Reconfigurable Snapshot HDR Imaging Using Coded Masks

  • Pages: 90-103
  • First Published: 11 March 2021
Transfer Deep Learning for Reconfigurable Snapshot HDR Imaging Using Coded Masks

This paper proposes a joint design for snapshot HDR imaging by devising a spatially varying modulation mask in the hardware and building a deep learning algorithm to reconstruct the HDR image.

Self-Supervised Learning of Part Mobility from Point Cloud Sequence

  • Pages: 104-116
  • First Published: 11 March 2021
Self-Supervised Learning of Part Mobility from Point Cloud Sequence

Part mobility analysis is a significant aspect required to achieve a functional understanding of 3D objects.

Fast Ray Tracing of Scale-Invariant Integral Surfaces

  • Pages: 117-134
  • First Published: 22 March 2021
Fast Ray Tracing of Scale-Invariant Integral Surfaces

Scale-invariant integral surfaces, which are implicit representations of surfaces, provide a way to define smooth surfaces from skeletons with prescribed radii defined at their vertices. We introduce a new rendering pipeline allowing to visualize such surfaces in real-time.

Open Access

Visualization of Tensor Fields in Mechanics

  • Pages: 135-161
  • First Published: 30 March 2021
Visualization of Tensor Fields in Mechanics

Tensors are used to describe complex physical processes in many applications.

IMAT: The Iterative Medial Axis Transform

  • Pages: 162-181
  • First Published: 08 April 2021
IMAT: The Iterative Medial Axis Transform

We present the iterative medial axis transform (IMAT), an iterative descent method that constructs a medial axis transform (MAT) for a sparse, noisy, oriented point cloud sampled from an object's boundary.

SREC-RT: A Structure for Ray Tracing Rounded Edges and Corners

  • Pages: 200-214
  • First Published: 18 April 2021
SREC-RT: A Structure for Ray Tracing Rounded Edges and Corners

Man-made objects commonly exhibit rounded edges and corners. The variation of surface normals at these locations produces shading details essential to the realism of synthetic scenes. The more specular the surface, the finer and more prominent its highlights. Most geometric modelers represent rounded edges and corners with dense polygonal meshes that are limited in terms of smoothness increasing scene complexity. This paper proposes a method for the efficient modeling and rendering of smooth edges and corners from any input polygonal geometry. Our contribution is a geometric structure that automatically and accurately defines the geometry of edge and corner rounded areas, as well as the topological relationships at edges and vertices. This structure (SREC-RT) is integrated in a ray-tracing-based acceleration structure in order to determine the region of interest of each rounded edge and corner. It allows systematic rounding of all edges and vertices without increasing the 3D scene geometric complexity. While the underlying rounded geometry can be of any type, we propose a ray-edge and ray-corner intersection based on parametric surfaces. Our results present the advantages of our method, including extreme close-up views of surfaces with a much higher quality for very little additional memory, and reasonable computation time overhead.

An Efficient Hybrid Optimization Strategy for Surface Reconstruction

  • Pages: 215-241
  • First Published: 22 April 2021
An Efficient Hybrid Optimization Strategy for Surface Reconstruction

An efficient surface reconstruction strategy is presented in this study, which is able to approximate non-convex sets of target points (TPs).

A Rapid, End-to-end, Generative Model for Gaseous Phenomena from Limited Views

  • Pages: 242-257
  • First Published: 27 April 2021
A Rapid, End-to-end, Generative Model for Gaseous Phenomena from Limited Views

Despite the rapid development and proliferation of computer graphics hardware devices for scene capture in the most recent decade, the high-resolution 3D/4D acquisition of gaseous scenes (e.g., smokes) in real time remains technically challenging in graphics research nowadays.

Estimating Garment Patterns from Static Scan Data

  • Pages: 273-287
  • First Published: 06 May 2021
Estimating Garment Patterns from Static Scan Data

This paper presents a new method for generating simulation-ready garment models from 3D static scan data of clothed humans. A key contribution of our method is a novel approach to segmenting garments by finding optimal boundaries between the skin and garment.

Inverse Dynamics Filtering for Sampling-based Motion Control

  • Pages: 304-314
  • First Published: 10 June 2021
Inverse Dynamics Filtering for Sampling-based Motion Control

We improve the sampling-based motion control method proposed by Liu et al. using inverse dynamics. The figure shows samples drawn for different frames of a jumping motion. The orange is the reference motion. The blue shows the samples drawn by our method (with sample covariance initialization) and the red shows the samples drawn by our implementation of the sampling-based motion control method. With the use of inverse dynamics torques and sample covariance initialization, our sample simulations can have higher success rates, and we can choose to draw control samples from tighter distributions to produce smoother results.

Open Access

Deep Neural Models for Illumination Estimation and Relighting: A Survey

  • Pages: 315-331
  • First Published: 09 June 2021
Deep Neural Models for Illumination Estimation and Relighting: A Survey

This contribution reviews the current advances in the application of deep neural computing to illumination estimation and relighting. We examine in detail the attributes of the proposed approaches, presented in three categories: scene illumination estimation, relighting with reflectance-aware scene-specific representations and finally relighting as image-to-image transformations. We also provide an overview of current publicly available datasets for neural lighting applications.

Open Access

Neural BRDF Representation and Importance Sampling

  • Pages: 332-346
  • First Published: 29 June 2021
Neural BRDF Representation and Importance Sampling

We present a compact neural network-based representation for measured BRDF data that combines high-accuracy reconstruction with efficient rendering via built-in interpolation of reflectance. Additionally, we implement a meta-learning autoencoder architecture that learns the space of real-world materials and generates compact embeddings, which we leverage for material generation through interpolation and efficient rendering via importance sampling.

Customized Summarizations of Visual Data Collections

  • Pages: 347-370
  • First Published: 12 July 2021
Customized Summarizations of Visual Data Collections

A visual comparison of various summarization methods. From left to right: classical sampling, clustering, contour trees, and CS-ADMM. CS-ADMM is able to distribute elements that are both fit and diverse. Our visualization scheme encodes high fitness values as dark red and low fitness values as dark blue. The individual elements are shown as black dots.

Half-body Portrait Relighting with Overcomplete Lighting Representation

  • Pages: 371-381
  • First Published: 01 July 2021
Half-body Portrait Relighting with Overcomplete Lighting Representation

We present a neural-based model for relighting a half-body portrait image by simply referring to another portrait image with the desired lighting condition.

Optimized Processing of Localized Collisions in Projective Dynamics

  • Pages: 382-393
  • First Published: 21 July 2021
Optimized Processing of Localized Collisions in Projective Dynamics

We present a method for the efficient processing of contact and collision in volumetric elastic models simulated using the Projective Dynamics paradigm.

Open Access

Visual Analysis of Large-Scale Protein-Ligand Interaction Data

  • Pages: 394-408
  • First Published: 02 August 2021
Visual Analysis of Large-Scale Protein-Ligand Interaction Data

We present an approach that is able to calculate several important properties from arbitrarily large protein-ligand interaction data and display them interactively. Furthermore, our web-based visualisation framework shows the extracted properties in a surface view as well as in our newly introduced Compressed Ligand Interaction Sequence Diagram.

Deep Reflectance Scanning: Recovering Spatially-varying Material Appearance from a Flash-lit Video Sequence

  • Pages: 409-427
  • First Published: 18 August 2021
Deep Reflectance Scanning: Recovering Spatially-varying Material Appearance from a Flash-lit Video Sequence

In this paper we present a novel method for recovering high-resolution spatially-varying isotropic surface reflectance of a planar exemplar from a flash-lit close-up video sequence captured with a regular hand-held mobile phone.

Example-Based Colour Transfer for 3D Point Clouds

  • Pages: 428-446
  • First Published: 09 August 2021
Example-Based Colour Transfer for 3D Point Clouds

Rendering a church point cloud (input) with the colour style of a fantasy house point cloud (target) using our colour transfer method.

Design and Evaluation of Visualization Techniques to Facilitate Argument Exploration

  • Pages: 447-465
  • First Published: 09 August 2021
Design and Evaluation of Visualization Techniques to Facilitate Argument Exploration

This paper reports the design and comparison of three visualizations to represent the structure and content within arguments.

Fashion Transfer: Dressing 3D Characters from Stylized Fashion Sketches

  • Pages: 466-483
  • First Published: 29 July 2021
Fashion Transfer: Dressing 3D Characters from Stylized Fashion Sketches

Our approach takes as input a single, annotated fashion drawing and synthesizes a 3D garment of similar style over any existing 3D character. The method handles deep folds and automatically adapts the garment to the morphology and pose of the target, allowing to easily dress human-looking to cartoon-style models.

Visual Analytics of Text Conversation Sentiment and Semantics

  • Pages: 484-499
  • First Published: 13 August 2021
Visual Analytics of Text Conversation Sentiment and Semantics

This paper describes the design and implementation of a web-based system to visualize large collections of text conversations integrated into a hierarchical four-level-of-detail design.