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I have been trying to understand how the Vray Sun/Sky + Vray Physical Camera combination relates to real world conditions. To test, I created a simple physical model that I photographed and built a similar 3D model that I rendered trying to match conditions and settings. I've shown the results below.
I immediately noticed that the Vray Sky seems to have much more cyan than does our sky in the mountain west US. No matter how I tried to adjust the color balance, I couldn't match the real world. I also tried putting the sky in an output map and adjust but that didn't help (but I don't know that much about how to use the output map).
The second thing I noticed was that the light bouncing off the cube was more intense in the model than in the photo. I played with the Primary and Secondary bounces but couldn't match the photo. I didn't try reducing the "generate GI" values, which would probably help.
I also discovered that almost without exception, the Vray Physical Cam was one stop brighter than the real camera. I either had to reduce the f-stop one stop or the ISO by 1/2 or increase shutter by 2.
Overall, I was very impressed at how quickly I was able to approximate the real world by using many of the default settings, the exception being the white balance. I hope that anyone who has had good luck replicating the real world will offer suggestions that will help me understand how to get better results.
Craig
Settings:
Gamma (display, input & output) 2.2
Mapping Linear multiply, 1,1,1
GI Primary IR, Secondary Brute Force
Medium Preset, HSph50, Int Smpls 20
Overcast Day Physical Cam WB RGB correction: 88, 157, 238
Sunny Day Physical Cam WB RGB correction: 242, 255, 250
Rendered to Max VFB, saved as 16 bit TIFF at 2.2. No PhotoShop corrections except to add text and save as jpeg.
Other settings shown in the images.
Cloudy Day
Sunny Day
I immediately noticed that the Vray Sky seems to have much more cyan than does our sky in the mountain west US. No matter how I tried to adjust the color balance, I couldn't match the real world. I also tried putting the sky in an output map and adjust but that didn't help (but I don't know that much about how to use the output map).
The second thing I noticed was that the light bouncing off the cube was more intense in the model than in the photo. I played with the Primary and Secondary bounces but couldn't match the photo. I didn't try reducing the "generate GI" values, which would probably help.
I also discovered that almost without exception, the Vray Physical Cam was one stop brighter than the real camera. I either had to reduce the f-stop one stop or the ISO by 1/2 or increase shutter by 2.
Overall, I was very impressed at how quickly I was able to approximate the real world by using many of the default settings, the exception being the white balance. I hope that anyone who has had good luck replicating the real world will offer suggestions that will help me understand how to get better results.
Craig
Settings:
Gamma (display, input & output) 2.2
Mapping Linear multiply, 1,1,1
GI Primary IR, Secondary Brute Force
Medium Preset, HSph50, Int Smpls 20
Overcast Day Physical Cam WB RGB correction: 88, 157, 238
Sunny Day Physical Cam WB RGB correction: 242, 255, 250
Rendered to Max VFB, saved as 16 bit TIFF at 2.2. No PhotoShop corrections except to add text and save as jpeg.
Other settings shown in the images.
Cloudy Day
Sunny Day
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