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3Delight – We have only one control for the general quality of the render. In the case of direct lighting, 3Delight "understands" that samples are best used for light sampling and that's what it does. As tests will show, those samples have a linear impact on perceived noise levels.

Results

The following graph gives a good idea on the algorithm sophistication of the different light samplers.

Chart

width	800
domainAxisUpperBound	300
title	RMSE vs. RAYS
type	xyLine
yLabel	RMSE
domainAxisLowerBound	0
xLabel	Million Rays

Rays	2.45	3.13	4.51	7.27	12.78	23.8	45.88	90.1
3Delight	0.0933142	0.0658266	0.0441248	0.0290439	0.0185575	0.0117566	0.00752546	0.00449892

Rays	0.678	3.26	10.8	16.94	43.4	173.6	694.5
Arnold	0.15699	0.100115	0.0501787	0.0396399	0.0242515	0.0117413	0.00693426

Rays	1.47	2.94	5.88	11.7	21.1	47.02	94.14	376.3	751.3
RenderMan/RIS	0.151125	0.121487	0.0953649	0.0728148	0.0520606	0.0373876	0.0265388	0.0138148	0.00854045

The following graph shows the time required to achieve a certain quality. From user's perspective, this is an important quantity.

Chart

width	800
title	RMSE vs. TIME
type	xyLine
yLabel	RMSE
xLabel	Time

Time	5.72s	8	12.82	22.18	40.92	86.91	165.69	302.98
3Delight	0.0933142	0.0658266	0.0441248	0.0290439	0.0185575	0.0117566	0.00752546	0.00449892

Time	1	2	6	9	21	81	492
Arnold	0.15699	0.100115	0.0501787	0.0396399	0.0242515	0.0117413	0.00693426

Time	6.74	7.23	7.99	9.42	18.51	29.40	98.08	383.39
RenderMan/RIS	0.151125	0.121487	0.0953649	0.0728148	0.0373876	0.0265388	0.0138148	0.00854045

The following graph shows how much time it takes to build the acceleration data structure depending on sample count.

Chart

width	800
domainAxisUpperBound	300
title	Time to First Pixel vs. Samples
type	xyLine
yLabel	Time to First Pixel
domainAxisLowerBound	0
rangeAxisUpperBound	50
xLabel	Million Rays

Rays	2.45	3.13	4.51	7.27	12.78	23.8	45.88	90.1
3Delight	2	2	2	2	2	2	2	2

Rays	0.678	3.26	10.8	43.4	173.6	694.5
Arnold	0	0.35	1.2	3.2	11	41

Rays	1.47	2.94	5.88	11.7	47.02	94.14	376.3	751.3
RenderMan	3	3.2	4	4.7	9	15.5	51.2	97

Arnold

Samples (effective)	2 (1.23)	4 (4.91)	8 (19.64)	10 (30)	16 (78.56)	32 (314.29)	64 (1257.18)
Image	Image Modified	Image Modified	Image Modified	Image Modified	Image Modified	Image Modified	Image Modified
Time	1s	2s	6s	9s	21s	1:21	8:12
TTFP	0s	0.35s	1.2s	2.0	3.2s	11s	41s
Shadow Rays	0.678 M	3.26 M	10.8 M	16.94 M	43.4 M	173.6 M	694.5 M
RMSE	0.15699	0.100115	0.0501787	0.0396399	0.0242515	0.0117413	0.00693426

3Delight

Samples	2	4	8	16	32	64	128	256
Image	Image Modified	Image Modified	Image Modified	Image Modified	Image Modified	Image Modified	Image Modified	Image Modified
Time	5.72s	8s	12.82 s	22.18 s	40.92 s	86.91	165.69 s	302.98
TTFP	3	3	3	3	3	3	3
Shadow Rays	2.45 M	3.13 M	4.51 M	7.27 M	12.78 M	23.8 M	45.88 M	90.1 M
RMSE	0.0933142	0.0658266	0.0441248	0.0290439	0.0185575	0.0117566	0.00752546	0.00449892

RenderMan/RIS

Samples	1	2	4	8	16	32	64	256	512	1024
Image	Image Modified	Image Modified	Image Modified	Image Modified	Image Modified	Image Modified	Image Modified	Image Modified	Image Modified	Image Modified
Time	6.74s	7.23s	7.99s	9.42s	12.12s	18.51s	29.40	1:38.08	3:15.77	6:23.39
TTFP	3.1s	3.2	4s	4.7s	6.7s	9s	15.5s	51.2s	97s
Rays	1.47 M	2.94 M	5.88 M	11.7 M	21.1M	47.02 M	94.14 M	376.3 M	751.3 M	1499 M
RMSE	0.151125	0.121487	0.0953649	0.0728148	0.0520606	0.0373876	0.0265388	0.0138148	0.00854045	0.00396