BVH for efficient raytracing of dynamic metaballs on GPU
Résumé
Metaballs [Bloomenthal 1997] are effective to represent fluids and similar complex and deformable geometries, but their implicit nature makes difficult their visualization in real time. A common strategy is to tessellate the resulting isosurface and to render it on GPU, but it scales poorly as the number of metaballs increases. Kanamori et al. [2008] efficiently raycast thousands of metaballs without intermediate representations. Their method assumes that rays are shot from a single viewpoint, thus preventing secondary effects (no shadows, reflections, etc.), and is limited to polynomial density functions. We propose to exploit the culling capacity of dynamic bounding volume hierarchies (BVH) [Wald 2007], the secant method for ray-surface intersection, and CPU-GPU parallelism to alleviate the restrictions of their method. This results in a general raytracing method, allowing arbitrary ray intersection (visibility, shadow, reflection, refraction, etc.) with metaballs of any finite-support at interactive performances.
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SIGGRAPH2009_Talk_Gourmel_et_al.pdf (3.44 Mo)
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Origine | Fichiers produits par l'(les) auteur(s) |
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