Combined surface and volumetric occlusion shading

Journal ArticleIn this paper, a method for interactive direct volume rendering is proposed that computes ambient occlusion effects for visualizations that combine both volumetric and geometric primitives, specifically tube shaped geometric objects representing streamlines, magnetic field lines or DTI fiber tracts. The proposed algorithm extends the recently proposed Directional Occlusion Shading model to allow the rendering of those geometric shapes in combination with a context providing 3D volume, considering mutual occlusion between structures represented by a volume or geometry

Screen Space Ambient Occlusion Using Partial Scene Representation

Screen space ambient occlusion (SSAO) is a technique in real-time rendering forapproximating amount by which a point on a surface is occluded by surrounding geometry, whichhelps in adding soft shadows to diffuse objects. Most of the current methods use the depth bufferas an approximation to scene geometry to sample the occlusion factor. We introduce a noveltechnique which uses a partial representation of the scene (here triangle information in screenspace) using compact triangle storage and a ray-marching approach to find a betterapproximation of the occlusion factor.Computer Scienc

Ambient Occlusion on Mobile: an empirical comparison

In this thesis, we study the feasibility of screen space ambient occlusion on a range of mobile devices. We implement several of the most popular techniques and propose two rendering pipelines, a custom algorithm and an optimisation that can be applied to any algorithm to speed up computation times