Staircase

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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	1458	2553	1288	1156	943	943	943
MAPE	0.137	0.0288	0.0226	0.0222	0.0188	0.0151	0.0356
SMAPE	0.138	0.0287	0.0224	0.0220	0.0187	0.0150	0.0338
L1	0.0142	3.22e−3	2.52e−3	2.51e−3	2.07e−3	1.55e−3	2.34e−3
MRSE	0.0102	5.29e−4	3.84e−4	3.95e−4	2.61e−4	1.39e−4	8.72e−4
L2	6.06e−4	3.43e−5	2.32e−5	2.40e−5	1.48e−5	8.51e−6	3.36e−5
1-SSIM	0.297	0.0207	0.0136	0.0131	9.75e−3	5.22e−3	8.06e−3