Pascal Barla
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View article: Trajectory-aware Smears for Stylized 3D Animations
Trajectory-aware Smears for Stylized 3D Animations Open
International audience
View article: Complex System Exploration with Interactive Human Guidance
Complex System Exploration with Interactive Human Guidance Open
The diversity of patterns that emerge from complex systems motivates their use for scientific or artistic purposes. When exploring these systems, the challenges faced are the size of the parameter space and the strongly non-linear mapping …
View article: Physically Based Shading in Theory and Practice
Physically Based Shading in Theory and Practice Open
International audience
View article: A Fluorescent Material Model for Non-Spectral Editing & Rendering
A Fluorescent Material Model for Non-Spectral Editing & Rendering Open
Fluorescent materials are characterized by a spectral reradiation toward longer wavelengths. Recent work [Fichet et al. 2024] has shown that the rendering of fluorescence in a non-spectral engine is possible through the use of appropriate …
View article: Importance Sampling of the Micrograin Visible NDF
Importance Sampling of the Micrograin Visible NDF Open
Importance sampling of visible normal distribution functions (vNDF) is a required ingredient for the efficient rendering of microfacet‐based materials. In this paper, we explain how to sample the vNDF for the micrograin material model [LRP…
View article: Efficient Modeling and Rendering of Iridescence from Cholesteric Liquid Crystals
Efficient Modeling and Rendering of Iridescence from Cholesteric Liquid Crystals Open
We introduce a novel approach to the efficient modeling and rendering of Cholesteric Liquid Crystals (CLCs), materials known for producing colorful effects due to their helical molecular structure. CLCs reflect circularly-polarized light w…
View article: A Fully-correlated Anisotropic Micrograin BSDF Model
A Fully-correlated Anisotropic Micrograin BSDF Model Open
We introduce an improved version of the micrograin BSDF model [Lucas et al. 2023] for the rendering of anisotropic porous layers. Our approach leverages the properties of micrograins to take into account the correlation between their heigh…
View article: SMEAR: Stylized Motion Exaggeration with ARt-direction
SMEAR: Stylized Motion Exaggeration with ARt-direction Open
International audience
View article: Non‐Orthogonal Reduction for Rendering Fluorescent Materials in Non‐Spectral Engines
Non‐Orthogonal Reduction for Rendering Fluorescent Materials in Non‐Spectral Engines Open
We propose a method to accurately handle fluorescence in a non‐spectral (e.g., tristimulus) rendering engine, showcasing color‐shifting and increased luminance effects. Core to our method is a principled reduction technique that encodes th…
View article: Interactive Exploration of Vivid Material Iridescence using Bragg Mirrors
Interactive Exploration of Vivid Material Iridescence using Bragg Mirrors Open
Many animals, plants or gems exhibit iridescent material appearance in nature. These are due to specific geometric structures at scales comparable to visible wavelengths, yielding so‐called structural colors. The most vivid examples are du…
View article: Motion and Layout Depiction Using 2D/3D Animation Tools
Motion and Layout Depiction Using 2D/3D Animation Tools Open
International audience
View article: La transparence, camouflage ultime ? Dépendance à l'égard du fond visuel et influence de l'intensité de la lumière ambiante
La transparence, camouflage ultime ? Dépendance à l'égard du fond visuel et influence de l'intensité de la lumière ambiante Open
The role of transparency in camouflage is understudied, particularly in terrestrial animals. What level of protection can intermediate levels of transparency offer? Does this protection depend on light conditions or background characterist…
View article: A Micrograin BSDF Model for the Rendering of Porous Layers
A Micrograin BSDF Model for the Rendering of Porous Layers Open
International audience
View article: Interactive Art-Directable Smear Frame Stylization
Interactive Art-Directable Smear Frame Stylization Open
International audience
View article: Efficient Interpolation of Rough Line Drawings
Efficient Interpolation of Rough Line Drawings Open
In traditional 2D animation, sketches drawn at distant keyframes are used to design motion, yet it would be far too labor‐intensive to draw all the inbetween frames to fully visualize that motion. We propose a novel efficient interpolation…
View article: FlavoMetrics: Towards a Digital Tool to Understand and Tune Living Aesthetics of Flavobacteria
FlavoMetrics: Towards a Digital Tool to Understand and Tune Living Aesthetics of Flavobacteria Open
International audience
View article: One‐to‐Many Spectral Upsampling of Reflectances and Transmittances
One‐to‐Many Spectral Upsampling of Reflectances and Transmittances Open
Spectral rendering is essential for the production of physically‐plausible synthetic images, but requires to introduce several changes in the content generation pipeline. In particular, the authoring of spectral material properties (e.g., …
View article: Numerical Analysis of Layered Materials Models
Numerical Analysis of Layered Materials Models Open
Most real-world materials are composed of multiple layers , whose physical properties impact the appearance of objects. The accurate reproduction of layered material properties is thus an important part of physically-based rendering applic…
View article: Designing Gratin, A GPU-Tailored Node-Based System
Designing Gratin, A GPU-Tailored Node-Based System Open
Nodal architectures have received an ever-increasing endorsement in computer graphics in recent years. However, creating a node-based system specifically tailored to GPU-centered applications with real-time performance is not straightforwa…
View article: Screen-Space Curvature for Production-Quality Rendering and Compositing
Screen-Space Curvature for Production-Quality Rendering and Compositing Open
Curvature is commonly employed for enhancing details in textured 3D models, or to modulate shading at the rendering or compositing stage. However, existing methods that compute curvature in object space rely on mesh-based surfaces and work…
View article: Non‐linear Rough 2D Animation using Transient Embeddings
Non‐linear Rough 2D Animation using Transient Embeddings Open
Traditional 2D animation requires time and dedication since tens of thousands of frames need to be drawn by hand for a typical production. Many computer‐assisted methods have been proposed to automatize the generation of inbetween frames f…
View article: Material category of visual objects computed from specular image structure
Material category of visual objects computed from specular image structure Open
Psychophysics data, stimuli, results analyses code, and image analyses code.
View article: Wiggle it a little bit - Active exploration and the visual perception of form and rigidity
Wiggle it a little bit - Active exploration and the visual perception of form and rigidity Open
Visual motion is a powerful signal that provides information about where we are heading, what is figure and what is ground or the material properties of objects in the world. Often visual motion is self-generated through active exploration…
View article: A Vectorial Solver for Free-form Vector Gradient
A Vectorial Solver for Free-form Vector Gradient Open
The creation of free-form vector drawings as been greatly improved in recent years with techniques based on harmonic or bi-harmonic interpolation. Such methods offer the best trade-off between spar- sity (keeping the number of control poin…
View article: Toward a Perceptually-relevant Theory of Appearance
Toward a Perceptually-relevant Theory of Appearance Open
Two approaches are commonly employed in Computer Graphics to design and adjust the appearance of objects in a scene. A full 3D environment may be created, through geometrical, material and lighting modeling, then rendered using a simulatio…
View article: Enhancing surface features with the Radiance Scaling Meshlab Plugin
Enhancing surface features with the Radiance Scaling Meshlab Plugin Open
We present the new Radiance Scaling plugin for Meshlab. This rendering technique allows to depict shape through shading via the modification of light intensities around specific features. The major idea is to correlate the shading with sur…
View article: Statistical Analysis of Bidirectional Reflectance Distribution Functions
Statistical Analysis of Bidirectional Reflectance Distribution Functions Open
Bidirectional Reflectance Distribution Functions (BRDFs) are commonly employed in Computer Graphics and Computer Vision to model opaque materials. On the one hand, a BRDF is a complex 4D function of both light and view directions, which sh…
View article: Shape features underlying the perception of liquids
Shape features underlying the perception of liquids Open
Visually identifying and estimating properties of materials is critical for many tasks, from reaching for a steaming kettle to walking on a wet marble staircase. From a computational point of view, liquids represent a particularly interest…