Abstract:Figure 1: left: Environment lighting. right) Modulated by Alchemy ambient obscurance, computed from 12 samples per pixel at 1280×720 in 3 ms on GeForce 580. The algorithm is easy to tune, robust, and captures darkening at many scales and orientations.
AbstractAmbient obscurance (AO) produces perceptually important illumination effects such as darkened corners, cracks, and wrinkles; proximity darkening; and contact shadows. We present the AO algorithm from the Alchemy engine used at Vicarious Visions in commerc… Show more
“…We use our method to accelerate the standard SSAO and Alchemy Screen-Space Ambient Obscurance(AAO) [3]. The accelerated versions are called CSSAO and CAAO respectively.…”
In this paper, we introduce a novel method to accelerate Screen Space Ambient Occlusion(SSAO) by exploiting spatial and temporal coherence. SSAO computation only depends on the surrounding pixels which is modeled as screen space local complexity function in this paper. Two pixels with similar local complexity should have close Ambient Occlusion(AO) value. Based on the above observation, the AO value of pixel p in the current frame might be directly adopted from some pixel p in previous frame. The experimental results indicate that our algorithm can improve the performance of SSAO by 20-40 percent but achieve the similar visual effect.
“…We use our method to accelerate the standard SSAO and Alchemy Screen-Space Ambient Obscurance(AAO) [3]. The accelerated versions are called CSSAO and CAAO respectively.…”
In this paper, we introduce a novel method to accelerate Screen Space Ambient Occlusion(SSAO) by exploiting spatial and temporal coherence. SSAO computation only depends on the surrounding pixels which is modeled as screen space local complexity function in this paper. Two pixels with similar local complexity should have close Ambient Occlusion(AO) value. Based on the above observation, the AO value of pixel p in the current frame might be directly adopted from some pixel p in previous frame. The experimental results indicate that our algorithm can improve the performance of SSAO by 20-40 percent but achieve the similar visual effect.
“…We furthermore utilize screen space effects that add illustrative aspects to the eventual rendering (Figure 6 ). Namely, we perform an outline contour enhancement and screen space ambient occlusion [ 32 ].It is important to mention that all parameters regarding the shape and the visual molecular appearance can be adjusted by the user in the process of setting up the simulation through the Unity3D GUI (Figure 7 ). Figure 6 A comparison between basic Unity3D diffuse rendering (a) and the additional use of screen space effects (b).…”
BackgroundResearch in cell biology is steadily contributing new knowledge about many aspects of physiological processes, both with respect to the involved molecular structures as well as their related function. Illustrations of the spatio-temporal development of such processes are not only used in biomedical education, but also can serve scientists as an additional platform for in-silico experiments.ResultsIn this paper, we contribute a new, three-level modeling approach to illustrate physiological processes from the class of polymerization at different time scales. We integrate physical and empirical modeling, according to which approach best suits the different involved levels of detail, and we additionally enable a form of interactive steering, while the process is illustrated. We demonstrate the suitability of our approach in the context of several polymerization processes and report from a first evaluation with domain experts.ConclusionWe conclude that our approach provides a new, hybrid modeling approach for illustrating the process of emergence in physiology, embedded in a densely filled environment. Our approach of a complementary fusion of three systems combines the strong points from the different modeling approaches and is capable to bridge different spatial and temporal scales.Electronic supplementary materialThe online version of this article (doi:10.1186/1471-2105-15-345) contains supplementary material, which is available to authorized users.
“…[ZIK98] introduced ambient obscurance, replacing the visibility function with a distance‐based falloff function. A large number of studies concerning both the approaches of obscurance and AO [MFS09, MOBH11] have since followed. After the initial screen‐space approaches appeared [Mit07, SA07], a number of new techniques improving performance and quality [BSD08, RGS09, BS09] were developed.…”
In urban design, estimating solar exposure on complex city models is crucial but existing solutions typically focus on simplified building models and are too demanding in terms of memory and computational time. In this paper, we propose an interactive technique that estimates solar exposure on detailed urban scenes. Given a directional exposure map computed over a given time period, we estimate the sky visibility factor that serves to evaluate the final exposure at each visible point. This is done using a screen-space method based on a two-scale approach, which is geometry independent and has low storage costs. Our method performs at interactive rates and is designer-oriented. The proposed technique is relevant in architecture and sustainable building design as it provides tools to estimate the energy performance of buildings as well as weathering effects in urban environmentsThis work was partially funded by TIN2014-52211-C2-2R project from Ministerio de Economía y Competitividad (Spain) and by the ANR under ref.
ANR-16-CE33-0001 (France
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