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Triangle representations often require tessellation\nschemes that do not capture the fine details of hair strands and fur as\neffectively and generally demand more storage. On the other hand, approaches\nusing intersection shaders can be compact but are usually highly computationally\nexpensive.",{"type":10,"tag":17,"props":29,"children":31},{"id":30},"_solution_space",[32],{"type":15,"value":33},"Solution Space",{"type":10,"tag":11,"props":35,"children":36},{},[37],{"type":15,"value":38},"Incorporating built-in geometry support for primitives such as spheres and\nlinear swept spheres provides an efficient solution for rendering\ncomplex geometries like fur or hair. This approach offers several advantages\nincluding reduced storage requirements and faster ray traversal,\nall while maintaining high-quality visual fidelity. By leveraging these\noptimized geometric representations, rendering systems can achieve both\nperformance and realism without the excessive overhead typically associated\nwith more traditional methods.",{"type":10,"tag":17,"props":40,"children":42},{"id":41},"_proposal",[43],{"type":15,"value":44},"Proposal",{"type":10,"tag":11,"props":46,"children":47},{},[48],{"type":15,"value":49},"This document proposes introducing two new primitives for ray tracing: the\nsphere primitive and the linear swept sphere (LSS) primitive, aimed at enabling\nefficient rendering of particle systems or fur-like geometries.",{"type":10,"tag":11,"props":51,"children":52},{},[53],{"type":15,"value":54},"Similar to triangles primitives, spheres and LSS primitives are provided to the\nbottom-level acceleration structure build as new geometry types.\nFor LSS primitives, flags passed to the acceleration structure build call\noffer some control over how positions and radii are indexed, as well as\nover which of the sphere endcaps are enabled. 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