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        "title": "Real-Time Rendering of Globally Illuminated Soft Glossy Scenes With Directional Light Maps",
        "date": "2002-03",
        "abstract": "Directional light maps allow to display globally illuminated static scenes with soft glossy surfaces at interactive frame-rates. They store the spatially and directionally varying incoming light at a surface in form of textures for a global set of incoming light directions. The directional light maps can be generated in a photon tracing preprocessing step. During a walkthrough they are used to render the globally illuminated surfaces with graphics hardware.",
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            "hardware acceleration",
            "interactive walkthrough",
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        "title": "Advanced radiance Estimation for Photon Map Global Illumination",
        "date": "2002",
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        "journal": "Computer Graphics Forum",
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        "volume": "21",
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        "title": "Importance sampling with hemispherical particle footprints",
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        "booktitle": "Spring Conference on Computer Graphics 2002",
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        "id": "Hey-thesis",
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        "title": "Photorealistic and Hardware Accelerated Rendering of Complex Scenes",
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    {
        "id": "Hey-2001-Glo",
        "type_id": "techreport",
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        "title": "Global Illumination with Photon Map Compensation",
        "date": "2001-01",
        "abstract": "We present a new method for the simulation of global illumination by utilization of a photon map. It uses an advanced radiance estimation which, in contrast to classical nearest neighbor area estimation, does not assume that the nearest neighbor photons lie in one plane or that they are uniformly distributed around the illuminated point. This allows us to correcly handle indirect illumination, eg. caustics, at edges and corners of objects without causing illumination artefacts in the vicinity of the edges and corners. We show how high quality results can be achieved by directly visualizing this illumination estimate without the usual low frequency noise of photon maps and without requiring a very large photon map.",
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        "number": "TR-186-2-01-04",
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        "keywords": [
            "radiance estimation",
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            "global illumination"
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    {
        "id": "Hey-2001-ImpX",
        "type_id": "techreport",
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        "title": "Importance Sampling with Hemispherical Particle Footprints",
        "date": "2001-01",
        "abstract": "We present a new importance sampling technique for stochastic ray-based global illumination methods. It allows to enhance the efficiency of global illumination calculations in general scenes with complex illumination settings by selecting preferably those sampling or shooting directions which yield a high contribution. The probability density functions for this are generated with a photon map or importance map that represents the expected contribution. A direction for a given point in the scene is selected by making directional footprints of the nearest neighbor particles onto the hemisphere of the point. By selecting the radii of the footprints adaptively according to the directional density of the particles, rays can be shot precisely into highly contributing regions where several particles come from in a small solid angle. We compare our new technique with existing particle map based importance sampling and show that our new technique achieves a considerably lower level of noise and spots in the same computation time.",
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        "authors": [
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        "number": "TR-186-2-01-05",
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        "keywords": [
            "importance map",
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    {
        "id": "Hey-2001-ReaX",
        "type_id": "techreport",
        "tu_id": null,
        "repositum_id": null,
        "title": "Real-Time Occlusion Culling With A Lazy Occlusion Grid",
        "date": "2001-01",
        "abstract": "We present a new conservative image-based occlusion culling method to increase the speed of hardware accelerated rendering of very complex general scenes which may consist of millions of polygons without time-expensive preprocessing. The method is based on a low-resolution grid upon a conventional z-buffer or an occlusion-buffer. This grid is updated in a lazy manner which reduces the number of expensive occlusion queries at pixel-level significantly compared to a busy update. It allows fast decisions if an object is occluded or potentially visible. The grid is used together with a bounding volume hierarchy that is traversed in a front to back order and which allows to cull large parts of the scene at once. We show that the method works efficiently on today´s available hardware and we compare lazy and busy updates.",
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        "number": "TR-186-2-01-02",
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        "research_areas": [],
        "keywords": [
            "hardware accelerated rendering",
            "real-time rendering",
            "visibility",
            "occlusion culling"
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    {
        "id": "Hey-2001-Occ",
        "type_id": "misc",
        "tu_id": null,
        "repositum_id": null,
        "title": "Occlusion Culling Methods",
        "date": "2001",
        "abstract": null,
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        "authors": [
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        ],
        "note": "State of the Art Report at Eurographics'01, Manchester, U.K., Sept. 2001",
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        "url": "https://www.cg.tuwien.ac.at/research/publications/2001/Hey-2001-Occ/",
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    {
        "id": "Hey-2001-Rea",
        "type_id": "misc",
        "tu_id": null,
        "repositum_id": null,
        "title": "Real-Time Occlusion Culling with a Lazy Occlusion Grid",
        "date": "2001",
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        "authors": [
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        ],
        "note": "In Rendering Techniques'01 (proceedings of Eurographics Workshop on Rendering 2001, June 2001), Springer-Verlag, Wien, 2001",
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    },
    {
        "id": "Hey-1999-Laz",
        "type_id": "techreport",
        "tu_id": null,
        "repositum_id": null,
        "title": "Lazy Occlusion Grid Culling",
        "date": "1999-03",
        "abstract": "THIS TECHNICAL REPORT IS OUTDATED AND HAS BEEN SUPERSEDED BY TR-186-2-01-02.\nWe present Lazy Occlusion Grid Culling, a new image-based occlusion\nculling technique for rendering of very large scenes which can be of\ngeneral type. It is based on a low-resolution grid that is updated in a\nlazy manner and that allows fast decisions if an object is occluded or\nvisible together with a hierarchical scene-representation to cull large\nparts of the scene at once. It is hardware-accelerateable and it works\nefficiently even on systems where pixel-based occlusion testing is\n                implemented in software.",
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        "number": "TR-186-2-99-12",
        "pages_from": "1",
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        "research_areas": [],
        "keywords": [
            "real-time rendering",
            "hardware acceleration",
            "image-based",
            "visibility",
            "occlusion culling"
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