Unifying Points, Beams, and Paths
(Still Life Image Comparison)

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Full transport reference solution (UPBP)

Full transport reference

Our UPBP solution (media transport)

UPBP (Our algorithm)

Comparison of our UPBP algorithm against previous work

Volumetric photon mapping (Point-Point 3D) Beam radiance estimate (Point-Beam<sub>l</sub> 2D) Photon beams (Beam<sub>s</sub>-Beam<sub>l</sub> 1D) Bidirectional path tracing (BPT)
Volumetric photon mapping (Point-Point 3D)
Beam radiance estimate (Point-Beaml 2D)
Photon beams (Beams-Beaml 1D)
Bidirectional path tracing (BPT)

Contributions of the different estimators to the UPBP result

Unweighted contributions:

Point-Point 3D (unweighted) Point-Beam<sub>l</sub> 2D (unweighted) Beam<sub>s</sub>-Beam<sub>l</sub> 1D (unweighted) MC path integration (unweighted)
Point-Point 3D (unweighted)
Point-Beaml 2D (unweighted)
Beams-Beaml 1D (unweighted)
MC path integration (unweighted)

Weighted contributions:

Point-Point 3D (weighted) Point-Beam<sub>l</sub> 2D (weighted) Beam<sub>s</sub>-Beam<sub>l</sub> 1D (weighted) MC path integration (weighted)
Point-Point 3D (weighted)
Point-Beaml 2D (weighted)
Beams-Beaml 1D (weighted)
MC path integration (weighted)