Hierarchical multi-layer screen-space ray tracing

Hofmann, Nikolai; Bogendörfer, Phillip; Stamminger, Marc; Selgrad, Kai

doi:10.1145/3105762.3105781

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…To get a good performance, they used a small number of rays per frame and temporally filtered the result. The screen space information lacks significant geometry data, therefore several techniques that use multi-layer [88], [89] and multi-view [90]- [92] methods have been proposed. In particular, Lambru et al [92] explored the possibility of using a 2D ray-casting process directly in the RSM pixels to produce reflections.…”

Section: ) Glossy Reflectionsmentioning

confidence: 99%

Comparative Analysis of Real-Time Global Illumination Techniques in Current Game Engines

Lambru¹,

Morar

Moldoveanu

et al. 2021

IEEE Access

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The most important component of photorealism in Computer Graphics is given by a physically correct approximation of the light transport. Besides the direct illumination from light sources, there is an indirect illumination, produced by the reflections of the light rays on other surfaces of the scene. In Computer Graphics, the process of computing the illumination of a surface by considering both the direct and the indirect illumination is widely known as global illumination. This paper describes several classes of real-time global illumination techniques used in current game engines together with our own implementations of these approaches. All implementations were made in our own framework, specially designed with a multi-pass rendering architecture that allows fast implementation of rendering techniques and the reuse of functionalities. We analyze these classes based on the following criteria: the visual results produced by the indirect diffuse lighting, the ability to produce glossy reflections, shadows, ambient occlusion, subsurface scattering, translucency and volumetric lighting as well as the ability to simulate area lights. We present the quantitative results of our implementations, obtained with the same external parameters for all techniques, thanks to the unified implementations in the same framework. An important observation is that our analysis is focused on the techniques that are based on the rasterization pipeline, thus, the comparison does not include the techniques designed entirely for the ray-tracing pipeline.

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Section: ) Glossy Reflectionsmentioning

confidence: 99%

Comparative Analysis of Real-Time Global Illumination Techniques in Current Game Engines

Lambru¹,

Morar

Moldoveanu

et al. 2021

IEEE Access

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“…T he illustration buffer introduced by Carnecky et al [5] is a view-aligned structure that stores all depth layers through a single data projection, and is used to control transparency at objects silhouettes for enhanced illustrations. Hofmann et al [21] perform screen-space ray marching on a hierarchical multi-layer structure, that merges fragments to form lower resolutions.…”

Section: Related Workmentioning

confidence: 99%

Fast occlusion-based point cloud exploration

2021

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Large-scale unstructured point cloud scenes can be quickly visualized without prior reconstruction by utilizing levels-of-detail structures to load an appropriate subset from out-of-core storage for rendering the current view. However, as soon as we need structures within the point cloud, e.g., for interactions between objects, the construction of state-of-the-art data structures requires O(NlogN) time for N points, which is not feasible in real time for millions of points that are possibly updated in each frame. Therefore, we propose to use a surface representation structure which trades off the (here negligible) disadvantage of single-frame use for both output-dominated and near-linear construction time in practice, exploiting the inherent 2D property of sampled surfaces in 3D. This structure tightly encompasses the assumed surface of unstructured points in a set of bounding depth intervals for each cell of a discrete 2D grid. The sorted depth samples in the structure permit fast surface queries, and on top of that an occlusion graph for the scene comes almost for free. This graph enables novel real-time user operations such as revealing partially occluded objects, or scrolling through layers of occluding objects, e.g., walls in a building. As an example application we showcase a 3D scene exploration framework that enables fast, more sophisticated interactions with point clouds rendered in real time.

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“…9, middle). Instead of following the Bresenham-style traversal scheme, Hoffman et al [HBSS17] relied on the exact 3D DDA scheme proposed by Amanatides and Woo [AW87] to ensure conservative pixel traversal.…”

Section: Image-space Traversalmentioning

confidence: 99%

A Survey of Multifragment Rendering

Vasilakis

Vardis

Παπαϊωάννου

2020

Computer Graphics Forum

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In the past few years, advances in graphics hardware have fuelled an explosion of research and development in the field of interactive and real‐time rendering in screen space. Following this trend, a rapidly increasing number of applications rely on multifragment rendering solutions to develop visually convincing graphics applications with dynamic content. The main advantage of these approaches is that they encompass additional rasterised geometry, by retaining more information from the fragment sampling domain, thus augmenting the visibility determination stage. With this survey, we provide an overview of and insight into the extensive, yet active research and respective literature on multifragment rendering. We formally present the multifragment rendering pipeline, clearly identifying the construction strategies, the core image operation categories and their mapping to the respective applications. We describe features and trade‐offs for each class of techniques, pointing out GPU optimisations and limitations and provide practical recommendations for choosing an appropriate method for each application. Finally, we offer fruitful context for discussion by outlining some existing problems and challenges as well as by presenting opportunities for impactful future research directions.

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Hierarchical multi-layer screen-space ray tracing

Cited by 6 publications

References 19 publications

Comparative Analysis of Real-Time Global Illumination Techniques in Current Game Engines

Comparative Analysis of Real-Time Global Illumination Techniques in Current Game Engines

Fast occlusion-based point cloud exploration

A Survey of Multifragment Rendering

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