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Images MAPE SMAPE L1 MRSE L2 1-SSIM

Reference1 Path Tracing2 PPG3 NIS4 NIS++ (Ours)5 NCV (Ours)6 NCV (Ours) + Heuristic Termination7 CV Integral at Primary Vertex8

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Charts

Lower values are better (for SSIM, we plot 1-SSIM).

MAPE

SMAPE

MRSE

1-SSIM

Metrics

Metric	Path Tracing	PPG	NIS	NIS++ (Ours)	NCV (Ours)	NCV (Ours) + Heuristic Termination	CV Integral at Primary Vertex
Render Time	2.0h	2.0h	2.0h	2.0h	2.0h	2.0h	2.0h
SPP	1756	2998	1231	1271	1188	1188	1188
MAPE	1.39	0.108	0.0791	0.0619	0.0564	0.0442	0.0910
SMAPE	1.30	0.0931	0.0728	0.0584	0.0542	0.0429	0.0826
L1	0.440	0.0166	0.0118	9.00e−3	0.0104	8.67e−3	0.0128
MRSE	1.13	0.0448	0.0135	7.11e−3	5.40e−3	2.69e−3	7.07e−3
L2	0.0700	1.10e−3	3.84e−4	2.06e−4	2.07e−4	1.16e−4	2.98e−4
1-SSIM	0.970	0.206	0.141	0.0863	0.0663	0.0431	0.0521