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Hi All,
I've been doing some tests with the min shading rate parameter. My understanding was that increasing the value will improve the quality of GI, materials, lighting etc and in turn the image sampler won't need to work as hard to clean up those areas. For the most part, this seems to be the case, but I'm starting to see the opposite, where I'm getting noisier Reflection and Lighting passes with increased MSR values.
Here are the settings:
Bucket image sampler - Min 1, Max 12, Clr Threshold 0.01, Noise Threshold 0.005, Use Local Subdivs OFF, IRMap and LC using saved maps.
Lit using a single HDRI in domelight.
Living snippet
RGB
Refl
SampleRate
Looking at the above, the sample rate is behaving as is expected. The reflection pass on the other hand is a little inconsistent. It's a little hard to see but the reflection quality on the coffee table improves with higher MSR values. With the joinery however, the quality is best at the lowest value of 6.
Kitchen snippet
RGB
Rawlighting
Here with a snippet of the kitchen, you can see how the rawlighting improves when increasing MSR from 6 to 20. Going further to 40 however, gives me a noisier result.
When rendering the scene as a whole, these are the figures from the Log Window
Complete Scene
MSR - 6
cam rays - 96.90
shad rays - 803.71
GI rays - 1.9
refl rays - 116.37
refr rays - 29.58
MSR - 20
cam rays - 72.05
shad rays - 1740.47
GI rays - 2.93
refl rays - 163.57
refr rays - 38.90
MSR - 40
cam rays - 54.94
shad rays - 2055.60
GI rays - 3.68
refl rays - 221.05
refr rays - 56.34
These figures seems to support my understanding of what the MSR should do. This changes when I render a small snippet of the living joinery and kitchen areas and record the values.
Living Snippet of Joinery
MSR - 6
cam rays - 128.39
shadow rays - 766.57
GI rays - 2.65
refl rays - 121.62
refr rays - 13.18
MSR - 20
cam rays - 70.46
shadow rays - 1327
GI rays - 1.33
refl rays - 72.37
refr rays - 7.22
MSR - 40
cam rays - 47.90
shadow rays - 1676.96
GI rays - 1.39
refl rays - 78.95
refr rays - 7.95
Kithen Snippet
MSR - 6
cam rays - 136.96
shadow rays - 1128.69
GI rays - 0.93
refl rays - 172.71
refr rays - 29.23
MSR - 20
cam rays - 125.45
shadow rays - 2916.45
GI rays - 1.22
refl rays - 255.40
refr rays - 40.94
MSR - 40
cam rays - 91.79
shadow rays - 2515.91
GI rays - 1.71
refl rays - 324.33
refr rays - 55.61
Can anyone explain the reasons behind this please.
Cheers
I've been doing some tests with the min shading rate parameter. My understanding was that increasing the value will improve the quality of GI, materials, lighting etc and in turn the image sampler won't need to work as hard to clean up those areas. For the most part, this seems to be the case, but I'm starting to see the opposite, where I'm getting noisier Reflection and Lighting passes with increased MSR values.
Here are the settings:
Bucket image sampler - Min 1, Max 12, Clr Threshold 0.01, Noise Threshold 0.005, Use Local Subdivs OFF, IRMap and LC using saved maps.
Lit using a single HDRI in domelight.
Living snippet
RGB
Refl
SampleRate
Looking at the above, the sample rate is behaving as is expected. The reflection pass on the other hand is a little inconsistent. It's a little hard to see but the reflection quality on the coffee table improves with higher MSR values. With the joinery however, the quality is best at the lowest value of 6.
Kitchen snippet
RGB
Rawlighting
Here with a snippet of the kitchen, you can see how the rawlighting improves when increasing MSR from 6 to 20. Going further to 40 however, gives me a noisier result.
When rendering the scene as a whole, these are the figures from the Log Window
Complete Scene
MSR - 6
cam rays - 96.90
shad rays - 803.71
GI rays - 1.9
refl rays - 116.37
refr rays - 29.58
MSR - 20
cam rays - 72.05
shad rays - 1740.47
GI rays - 2.93
refl rays - 163.57
refr rays - 38.90
MSR - 40
cam rays - 54.94
shad rays - 2055.60
GI rays - 3.68
refl rays - 221.05
refr rays - 56.34
These figures seems to support my understanding of what the MSR should do. This changes when I render a small snippet of the living joinery and kitchen areas and record the values.
Living Snippet of Joinery
MSR - 6
cam rays - 128.39
shadow rays - 766.57
GI rays - 2.65
refl rays - 121.62
refr rays - 13.18
MSR - 20
cam rays - 70.46
shadow rays - 1327
GI rays - 1.33
refl rays - 72.37
refr rays - 7.22
MSR - 40
cam rays - 47.90
shadow rays - 1676.96
GI rays - 1.39
refl rays - 78.95
refr rays - 7.95
Kithen Snippet
MSR - 6
cam rays - 136.96
shadow rays - 1128.69
GI rays - 0.93
refl rays - 172.71
refr rays - 29.23
MSR - 20
cam rays - 125.45
shadow rays - 2916.45
GI rays - 1.22
refl rays - 255.40
refr rays - 40.94
MSR - 40
cam rays - 91.79
shadow rays - 2515.91
GI rays - 1.71
refl rays - 324.33
refr rays - 55.61
Can anyone explain the reasons behind this please.
Cheers
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