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

Chart
width800
domainAxisUpperBound300
titleRMSE vs. RAYS
typexyLine
yLabelRMSE
domainAxisLowerBound0
xLabelMillion Rays



Rays2.453.134.517.2712.7823.845.8890.1
3Delight0.09331420.06582660.04412480.02904390.01855750.01175660.00752546

0.00449892



Rays0.6783.2610.816.9443.4173.6694.5
Arnold0.156990.1001150.05017870.03963990.02425150.01174130.00693426



Rays1.472.945.8811.721.147.0294.14376.3751.3
RenderMan/RIS0.1511250.1214870.09536490.07281480.05206060.03738760.02653880.01381480.00854045



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

Chart
width800
titleRMSE vs. TIME
typexyLine
yLabelRMSE
xLabelTime (seconds)
Time5.72s7.6312.1520.6837.7572.07142.05280.68
3Delight0.09331420.06582660.04412480.02904390.01855750.01175660.00752546

0.00449892

Time12692181492
Arnold0.156990.1001150.05017870.03963990.02425150.01174130.00693426
Time6.747.237.999.4218.5129.4098.08383.39
RenderMan/RIS0.1511250.1214870.09536490.07281480.0373876


0.02653880.01381480.00854045
The following graph shows how much time it takes to build the acceleration data structure depending on sample/ray count.

Chart
width800
domainAxisUpperBound300
titleTime to First Pixel vs. Rays
typexyLine
yLabelTime to First Pixel (seconds)
domainAxisLowerBound0
rangeAxisUpperBound50
xLabelMillion Rays
Rays2.453.134.517.2712.7823.845.8890.1
3Delight2222222

2

Rays0.6783.2610.843.4173.6694.5
Arnold00.351.23.21141
Rays1.472.945.8811.747.0294.14376.3751.3
RenderMan33.244.7915.551.297

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