44-Issue 8

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https://diglib.eg.org/handle/10.2312/3607201

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Browsing 44-Issue 8 by Subject "Computing methodologies → Ray tracing"

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    Fused Collapsing for Wide BVH Construction
    (The Eurographics Association and John Wiley & Sons Ltd., 2025) Barbier, Wilhem; Paulin, Mathias; Knoll, Aaron; Peters, Christoph
    We propose a novel approach for constructing wide bounding volume hierarchies on the GPU by integrating a simple bottom-up collapsing procedure within an existing binary bottom-up BVH builder. Our approach directly constructs a wide BVH without traversing a temporary binary BVH as done by previous approaches and achieves 1.4−1.6× lower build times. We demonstrate the ability of our algorithm to output compressed wide BVHs using existing compressed representations. We analyze the impact of our method on software raytracing performance and show that it reduces the overall frame time on complex dynamic scenes where rebuilding the BVH every frame is the limiting factor on rendering performance.
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    UBVH: Unified Bounding Volume and Scene Geometry Representation for Ray Tracing
    (The Eurographics Association and John Wiley & Sons Ltd., 2025) Kácerik, Martin; Bittner, Jirí; Knoll, Aaron; Peters, Christoph
    Bounding volume hierarchies (BVHs) are currently the most common data structure used to accelerate ray tracing. The existing BVH methods distinguish between the bounding volume representation associated with the interior BVH nodes and the scene geometry representation associated with leaf nodes. We propose a new method that unifies the representation of bounding volumes and triangular scene geometry. Our unified representation builds on skewed oriented bounding boxes (SOBB) that yield tight bounds for interior nodes and precise representation for triangles in the leaf nodes. This innovation allows to streamline the conventional massively parallel BVH traversal, as there is no need to switch between testing for ray intersection in interior nodes and leaf nodes. The results show that the proposed method accelerates ray tracing of incoherent rays between 1.2x-11.8x over the AABB BVH, 1.4x-4.2x over the 14-DOP BVH, 1.1x-2.0x over the OBB BVH, and by 1.1x-1.7x over the SOBB BVH.