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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 |
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| width | 800 |
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| domainAxisUpperBound | 300 |
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| title | RMSE vs. RAYS |
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| type | xyLine |
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| yLabel | RMSE |
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| domainAxisLowerBound | 0 |
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| xLabel | Million Rays |
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|
| Rays | 2.45 | 3.13 | 4.51 | 7.27 | 12.78 | 23.8 | 45.88 | 90.1 |
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| 3Delight | 0.0933142 | 0.0658266 | 0.0441248 | 0.0290439 | 0.0185575 | 0.0117566 | 0.00752546 | 0.00449892 |
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| Rays | 0.678 | 3.26 | 10.8 | 16.94 | 43.4 | 173.6 | 694.5 |
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| Arnold | 0.15699 | 0.100115 | 0.0501787 | 0.0396399 | 0.0242515 | 0.0117413 | 0.00693426 |
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| Rays | 1.47 | 2.94 | 5.88 | 11.7 | 21.1 | 47.02 | 94.14 | 376.3 | 751.3 |
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| RenderMan/RIS | 0.151125 | 0.121487 | 0.0953649 | 0.0728148 | 0.0520606 | 0.0373876 | 0.0265388 | 0.0138148 | 0.00854045 |
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The following graph shows the time required to achieve a certain quality. From user's perspective, this is an important quantity.
| | Chart |
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| width | 800 |
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| title | RMSE vs. TIME |
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| type | xyLine |
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| yLabel | RMSE |
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| xLabel | Time |
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| | Time | 5.72s | 7.63 | 12.15 | 20.68 | 37.75 | 72.07 | 142.05 | 280.68 |
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| 3Delight | 0.0933142 | 0.0658266 | 0.0441248 | 0.0290439 | 0.0185575 | 0.0117566 | 0.00752546 | 0.00449892 |
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| Time | 1 | 2 | 6 | 9 | 21 | 81 | 492 |
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| Arnold | 0.15699 | 0.100115 | 0.0501787 | 0.0396399 | 0.0242515 | 0.0117413 | 0.00693426 |
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| Time | 6.74 | 7.23 | 7.99 | 9.42 | 18.51 | 29.40 | 98.08 | 383.39 |
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| RenderMan/RIS | 0.151125 | 0.121487 | 0.0953649 | 0.0728148 | 0.0373876
| 0.0265388 | 0.0138148 | 0.00854045 |
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The following graph shows how much time it takes to build the acceleration data structure depending on sample/ray count.
| | Chart |
|---|
| width | 800 |
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| domainAxisUpperBound | 300 |
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| title | Time to First Pixel vs. Rays |
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| type | xyLine |
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| yLabel | Time to First Pixel |
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| domainAxisLowerBound | 0 |
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| rangeAxisUpperBound | 50 |
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| xLabel | Million Rays |
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| | Rays | 2.45 | 3.13 | 4.51 | 7.27 | 12.78 | 23.8 | 45.88 | 90.1 |
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| 3Delight | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
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| Rays | 0.678 | 3.26 | 10.8 | 43.4 | 173.6 | 694.5 |
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| Arnold | 0 | 0.35 | 1.2 | 3.2 | 11 | 41 |
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| Rays | 1.47 | 2.94 | 5.88 | 11.7 | 47.02 | 94.14 | 376.3 | 751.3 |
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| RenderMan | 3 | 3.2 | 4 | 4.7 | 9 | 15.5 | 51.2 | 97 |
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Arnold
*TTFP = Time to first pixel.
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