Vědecké schůzky
středa 17. 7. 2024 v 11:00
Martin Káčerik, Jiří Bittner – SAH-Optimized k-DOP Hierarchies for Ray Tracing
Prezentace článku na HPG 2024
Abstract: We revisit the idea of using hierarchies of k-sided discrete orientation polytopes (k-DOPs) for ray tracing. We propose a method for building a k-DOP based bounding volume hierarchy while optimizing its topology using the surface area heuristic. The key component of our method is a fast and exact algorithm for evaluating the surface area of a 14-DOP combined with the parallel locally ordered clustering algorithm (PLOC). Our k-DOP PLOC builder has about 40% longer build times than AABB PLOC, but for scenes with oblong slanted objects, the resulting BVH provides up to 2.5𝑥 ray tracing speedup over AABB BVH. We also show that k-DOPs can be used in combination with other techniques, such as oriented bounding boxes (OBBs). Transforming k-DOP BVH into OBB BVH is straightforward and provides up to 12% better trace times than the transformation from AABB to OBB BVH.
středa 29. 11. 2023 v 10:00
Vojtěch Radakulan, David Sedláček – The Most Expensive Museum in the World: Three Player Cooperative Game Between VR and PC Platforms Investigating Empathy between Players and Historical Characters.
Prezentace clanku an SIGGRAPH Asia, Art Papers
Abstract: The paper describes an art installation based on a local cooperative cross platform VR/PC game for three players. The story is based on the historical story of a nuclear power plant, which was built, but never turned on because of a public referendum. The game mechanics is built upon interaction of three playable historical characters: engineer, activist, and politician. The main goal was to induce empathy in the players by replaying the game from each character’s perspective. We present the story implementation, custom made interfaces, physical setup, and an evaluation by recordings from four-month display in a public gallery.
středa 4. 10. 2023 v 10:00
Martin Káčerik – PVLI: Potentially Visible Layered Image for Real-Time Ray Tracing
Prezentace clanku z Visual Computer / CGI 2023 (15 min + diskuze)
středa 3. 5. 2023 v 10:00
Ivo Malý – Draw-Cut-Glue: Comparison of Paper House Model Creation in Virtual Reality and on Paper in Museum Education Programme – Pilot Study
Prezentace clanku na EG 2023 – Education (20 min + diskuze)
Ivo Malý, Iva Vachková, David Sedláček. Draw-Cut-Glue: Comparison of Paper House Model Creation in Virtual Reality and on Paper in Museum Education Programme – Pilot Study
Martin Káčerik – On the Importance of Scene Structure for Hardware-Accelerated Ray Tracing
Prezentace clanku na WSCG 2023 – communication papers (10 min + diskuze)
Martin Káčerik, Jiri Bittner – On the Importance of Scene Structure for Hardware-Accelerated Ray Tracing
Asbtract: Ray tracing is typically accelerated by organizing the scene geometry into an acceleration data structure. Hardware-accelerated ray tracing, available through modern graphics APIs, exposes an interface to the acceleration structure builder that builds it, given the input scene geometry. This builder is, however, opaque, with limited control over the internal building algorithm. Additional control is available through the layout of builder input data, a geometry of the scene structured in a user-defined way. In this work, we evaluate the impact of a different scene structuring on the performance of the ray-triangle intersections in the context of hardware-accelerated ray tracing. We discuss the possible causes of significantly different outcomes for the same scene and outline a solution in the form of automatic input structure optimization.