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We present a voxel-based rendering pipeline for large 3D line sets thatemploys GPU ray-casting to achieve scalable rendering including transparencyand global illumination effects that cannot be achieved with GPU rasterization.Even for opaque lines we demonstrate superior rendering performance compared toGPU rasterization of lines, and when transparency is used we can interactivelyrender large amounts of lines that are infeasible to be rendered viarasterization. To achieve this, we propose a direction-preserving encoding oflines into a regular voxel grid, along with the quantization of directionsusing face-to-face connectivity in this grid. On the regular grid structure,parallel GPU ray-casting is used to determine visible fragments in correctvisibility order. To enable interactive rendering of global illuminationeffects like low-frequency shadows and ambient occlusions, illuminationsimulation is performed during ray-casting on a level-of-detail (LoD) linerepresentation that considers the number of lines and their lengths per voxel.In this way we can render effects which are very difficult to render via GPUrasterization. A detailed performance and quality evaluation compares ourapproach to rasterization-based rendering of lines.

A Voxel-based Rendering Pipeline for Large 3D Line Sets