CACHED MULTI-BOUNCE SOLUTION AND RECONSTRUCTION FOR VOXEL-BASED GLOBAL ILLUMINATION

International audienceWe address the main shortcomings of the voxel-based multi-bounce global illumination method of Chatelier and Malgouyres (2006), by introducing an iterated cached method which allows increasing sampling coarse-ness at each bounce for improved efficiency, and by introducing a ray-tracing based reconstruction process for a better final image quality. The result is a competitive accurate multi-bounce global illumination method with octree voxel-based irradiance caching

Semantic Visual Localization

Robust visual localization under a wide range of viewing conditions is a fundamental problem in computer vision. Handling the difficult cases of this problem is not only very challenging but also of high practical relevance, e.g., in the context of life-long localization for augmented reality or autonomous robots. In this paper, we propose a novel approach based on a joint 3D geometric and semantic understanding of the world, enabling it to succeed under conditions where previous approaches failed. Our method leverages a novel generative model for descriptor learning, trained on semantic scene completion as an auxiliary task. The resulting 3D descriptors are robust to missing observations by encoding high-level 3D geometric and semantic information. Experiments on several challenging large-scale localization datasets demonstrate reliable localization under extreme viewpoint, illumination, and geometry changes

Voxel Cone Tracing

Tato práce se zabývá výpočtem globálního osvětlení ve scéně pomocí metody Voxel Cone Tracing. Jejím základem je voxelizace scény z trojúhelníkové reprezentace. Voxelizace může být prováděna do plné pravidelné 3D mřížky (textury) nebo do hierarchického Sparse Voxel Octree (řídkého voxelového stromu) pro ušetření paměťového prostoru. Tato voxelová reprezentace je dále využita pro výpočty globálního nepřímého osvětlení v reálném čase v normálních trojúhelníkových scénách pro zlepšení realističnosti finálního obrazu. Hodnoty z voxelů jsou získávány sledováním kuželových paprsků z pixelů, pro které chceme zjistit osvětlení.This thesis deals with the global illumination in the scene by using Voxel Cone Tracing method. It is based on the voxelization of a triangle mesh scene. The voxels can be stored to a full regular 3D grid (texture) or to the hierarchic Sparse Voxel Octree for saving of the memory space. This voxel representation is further used for computations of the global indirect illumination in real time within normal triangle mesh scenes for more realistic final image. Values from the voxels are obtained by tracing cones from the pixels which we want to get illumination for.