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We propose a novel approach for using directional Line Space information in calculation of indirect illumination.Typically, the Line Space is build on top of regular recursive grids and contains visibility information which is usedto perform an efficient empty space skipping during traversal. In our method we extend the stored information byprecomputed representative candidates, which are based on the Line Space shafts and serve as an approximationof the actual scene geometry. By using these candidates it is not necessary to compute any intersection tests andtherefore the traversal is accelerated. However, the candidate approximation leads to visible artifacts. We thereforepresent a technique that significantly reduces these artifacts by extrapolation of the actual surface and demonstratethat the artifacts are nearly not perceivable in the application of indirect illumination. Moreover we adapt the LineSpace to other data structures like bounding volume hierarchies (BVHs) which further increases the performancein ray tracing. Compared to the pure data structures we achieve significantly better performance with nearly nodrawback in quality of indirect lighting.

Fast Indirect Lighting Approximations using the Representative Candidate Line Space