Magrathea-Pathfinder: a 3D adaptive-mesh code for geodesic ray tracing in N-body simulations

Open Access

Table 1

Ray-tracing run-time for a single integration step, averaged over 100 realisations of the same trajectory and depending on the type of interpolation.

Integration	Time per step (μs)
FLRW	0.55
NGP	1.10
CIC	6.0
TSC	14.6

Notes. We consider a photon trajectory with 4 steps per AMR cell on the narrow light cone of the RayGal simulation until z = 10. The total number of integration steps is roughly 5 × 10⁴.

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