Voxel-space ambient occlusion

Penmatsa, Rajeev; Nichols, Greg; Wyman, Chris

doi:10.1145/1730804.1730989

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…Due to the flexibility of the voxel representation of the scene geometry, several techniques [59], [114]- [116] were proposed to compute the ambient occlusion using the voxel volume.…”

Section: ) Ambient Occlusionmentioning

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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“…Due to the flexibility of the voxel representation of the scene geometry, several techniques [59], [114]- [116] were proposed to compute the ambient occlusion using the voxel volume.…”

Section: ) Ambient Occlusionmentioning

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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“…An alternative approach to solving the problem of calculating ambient occlusion is Voxelspace ambient occlusion (VXAO) [17]. Instead of using the information available in screen space, this method builds a voxel representation of the scene geometry that covers a large area around the camera.…”

Section: Calculation Of Ambient Occlusion In Object Space In Real Timementioning

confidence: 99%

Pyramid HBAO — a Scalable Horizon-based Ambient Occlusion Method

Astapov

Frolov²,

Галактионов³

2021

Proceedings of the 31th International Conference on Computer Graphics and Vision. Volume 2

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Screen-space Ambient Occlusion (SSAO) methods have become an integral part of the process of calculating global illumination effects in real-time applications. The use of ambient occlusion improves the perception of the geometry of the scene, and also makes a significant contribution to the realism of the rendered image. However, the problems of accuracy and efficiency of algorithms of calculating ambient occlusion remain relevant. Most of the existing methods have similar algorithmic complexity, what makes their use in real-time applications very limited. The performance issues of methods working in the screen space are particularly acute in the current growing spreadness of 4K (3840 x 2160 pixels) resolution of the rendered image. In this paper we provide our own algorithm Pyramid HBAO, which enhances the classic HBAO method by changing its calculation complexity for high resolution.

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DeepAO: Efficient Screen Space Ambient Occlusion Generation via Deep Network

et al. 2020

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Ambient occlusion (abbr. AO) plays an important role in realistic rendering applications because AO produces more realistic ambient lighting, which is achieved by calculating the brightness of certain screen parts based on objects' geometry. However, the baseline computation of AO algorithm is time-consuming, which limits its application for real-time rendering. Currently, most AO algorithms are based on screen space to reduce the computational consumption, which leads to unrealistic results due to the usage of artificial features. To overcome these challenges, in this paper, we first create a well-crafted dataset with the pair of deferred shading buffer data and ground-truth AO shaded images. Then, we design an efficient deep neural network for the screen space AO image generation, based on which we further design a Compute Shader Library to compute the shaded AO images. Our extensive experimental results show that our method achieves competent performance than existing screen space ambient or volumetric ambient based AO methods both in visual quality and efficiency. INDEX TERMS Ambient occlusion, rendering, shading, deep neural network.

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Voxel-space ambient occlusion

Abstract: Figure 1: Image of a complex scene rendered using voxel-space ambient occlusion

Cited by 5 publications

References 2 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

Pyramid HBAO — a Scalable Horizon-based Ambient Occlusion Method

DeepAO: Efficient Screen Space Ambient Occlusion Generation via Deep Network

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