3,913 research outputs found
Shape Animation with Combined Captured and Simulated Dynamics
We present a novel volumetric animation generation framework to create new
types of animations from raw 3D surface or point cloud sequence of captured
real performances. The framework considers as input time incoherent 3D
observations of a moving shape, and is thus particularly suitable for the
output of performance capture platforms. In our system, a suitable virtual
representation of the actor is built from real captures that allows seamless
combination and simulation with virtual external forces and objects, in which
the original captured actor can be reshaped, disassembled or reassembled from
user-specified virtual physics. Instead of using the dominant surface-based
geometric representation of the capture, which is less suitable for volumetric
effects, our pipeline exploits Centroidal Voronoi tessellation decompositions
as unified volumetric representation of the real captured actor, which we show
can be used seamlessly as a building block for all processing stages, from
capture and tracking to virtual physic simulation. The representation makes no
human specific assumption and can be used to capture and re-simulate the actor
with props or other moving scenery elements. We demonstrate the potential of
this pipeline for virtual reanimation of a real captured event with various
unprecedented volumetric visual effects, such as volumetric distortion,
erosion, morphing, gravity pull, or collisions
Procedural Cloudscapes
International audienceWe present a phenomenological approach for modeling and animating cloudscapes. We propose a compact procedural model for representing the different types of cloud over a range of altitudes. We define primitive-based field functions that allow the user to control and author the cloud cover over large distances easily. Our approach allows us to animate cloudscapes by morphing: instead of simulating the evolution of clouds using a physically-based simulation, we compute the movement of clouds using key-frame interpolation and tackle the morphing problem as an Optimal Transport problem. The trajectories of the cloud cover primitives are generated by solving an Anisotropic Shortest Path problem with a cost function that takes into account the elevation of the terrain and the parameters of the wind field
Intelligent Generation of Graphical Game Assets: A Conceptual Framework and Systematic Review of the State of the Art
Procedural content generation (PCG) can be applied to a wide variety of tasks
in games, from narratives, levels and sounds, to trees and weapons. A large
amount of game content is comprised of graphical assets, such as clouds,
buildings or vegetation, that do not require gameplay function considerations.
There is also a breadth of literature examining the procedural generation of
such elements for purposes outside of games. The body of research, focused on
specific methods for generating specific assets, provides a narrow view of the
available possibilities. Hence, it is difficult to have a clear picture of all
approaches and possibilities, with no guide for interested parties to discover
possible methods and approaches for their needs, and no facility to guide them
through each technique or approach to map out the process of using them.
Therefore, a systematic literature review has been conducted, yielding 200
accepted papers. This paper explores state-of-the-art approaches to graphical
asset generation, examining research from a wide range of applications, inside
and outside of games. Informed by the literature, a conceptual framework has
been derived to address the aforementioned gaps
Model for volume lighting and modeling
Journal ArticleAbstract-Direct volume rendering is a commonly used technique in visualization applications. Many of these applications require sophisticated shading models to capture subtle lighting effects and characteristics of volumetric data and materials. For many volumes, homogeneous regions pose problems for typical gradient-based surface shading. Many common objects and natural phenomena exhibit visual quality that cannot be captured using simple lighting models or cannot be solved at interactive rates using more sophisticated methods. We present a simple yet effective interactive shading model which captures volumetric light attenuation effects that incorporates volumetric shadows, an approximation to phase functions, an approximation to forward scattering, and chromatic attenuation that provides the subtle appearance of translucency. We also present a technique for volume displacement or perturbation that allows realistic interactive modeling of high frequency detail for both real and synthetic volumetric data
Creation of modular 3D assets for videogames
Hráči počítačových her mají stále vyšší a vyšší nároky na grafické zpracování herního světa a jeho detaily. Aby jim mohlo být vyhověno, grafici musí neustále upravovat svůj přístup a používané modelovací techniky. Jeden z moderních a populárních přístupů je založen na modularitě a modulárním designu. Přestože tento přístup má spoustu benefitů, přesný popis technik a znalostí spojených s tímto konceptem není stále pevně definovaný. Tato práce poskytuje náhled na různé modelovací techniky, software pro 3D modelování a detailní popis modulárního přístupu aplikovaného v aktuálních počítačových hrách. Kombinací procedurálních modelovacích technik a modulárního designu jsme v programu Houdini připravili několik assetů už pouze čekajících na reálné využití. Dále jsme v Unreal Enginu poskládali testovací scénu a tím získali hlubší přehled o výhodách a nevýhodách použitého přístupu k tvorbě grafiky počítačových her.In order to keep up with the ever-increasing player's demand for higher visual fidelity of game environments, artists are continually implementing new modelling techniques and production methods into their workflow. One popular contemporary approach that has emerged is based on the notion of modular design. Although it offers many benefits for production workflow, the particular techniques and skills associated with this concept are still not well defined. This thesis provides an overview of various modelling techniques, 3D modelling software and thorough discussion of the modular design paradigm applied in computer games. We have combined procedural modelling techniques with the concept of modular design to create several game-ready assets in Houdini. We then assembled a simple test scene in Unreal Engine in order to gain a more in-depth insight into the advantages and disadvantages of the discussed workflow
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Implementation of a Functionally Gradient Material Modeling and Design System
New advancements in Solid Freeform Fabrication (SFF) processes promise the capability
to produce Functionally Gradient Material (FGM) parts, in which the material compositions vary
spatially. To realize this potential there is a need for CAD methods and design software to
model, design, represent and exchange material information and instructions to the
manufacturing process. However, currently available commercial CAD systems are limited to
representing and storing only geometric information, which is not adequate for material design
purposes. This work presents an extension of a theoretical approach based on Volumetric MultiTexturing (VMT) and hypertexturing schemes to make the material design process intuitive and
user controllable. Inverse distance weighted interpolation is used in conjunction with procedural
material functions to accomplish axial or linear material gradient directions from surface to
surface across a solid. This offers the capability of specifying fixed material composition values
to the faces in the solid and blending them across the interior of the solid. The extension of the
proposed approach to the modeling of discrete material domains is also discussed. These material
regions can be combined using special sets of operators depending on the form of the material
functions. Finally, a design environment has been developed, which allows users to
systematically apply material information to geometry and captures design intent.Mechanical Engineerin
Interactive translucent volume rendering and procedural modeling
Journal ArticleDirect volume rendering is a commonly used technique in visualization applications. Many of these applications require sophisticated shading models to capture subtle lighting effects and characteristics of volume metric data and materials. Many common objects and natural phenomena exhibit visual quality that cannot be captured using simple lighting models or cannot be solved at interactive rates using more sophisticated methods. We present a simple yet effective interactive shading model which captures volumetric light attenuation effects to produce volumetric shadows and the subtle appearance of translucency. We also present a technique for volume displacement or perturbation that allows realistic interactive modeling of high frequency detail for real and synthetic volumetric data
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