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• min_shade_rate - Use a value between 6 and 8.
  
  For Adaptive sampler:
• dmc_minSubdivs - In general, keep at value 1 to avoid unnecessary sampling. There may be some exception cases (such as fog) where 1 is not enough and leads to visual artifacts.
• dmc_maxSubdivs - Start with 24 and increase if noise doesn't go away.
• dmc_threshold - Start with 0.005 and decrease it if increasing dmc_maxSubdivs doesn't help with noise. You could keep it higher like 0.01 of course, if you want fast renders.
• dmc_adaptive_method - We recommend you enable this (the default is 0 for the legacy sampler) to use the improved sampling algorithm that samples the image according to noise, leading to an even noise distribution per unit of render time.
  
  Progressive sampler:
• progressive_minSubdivs - Keep at value 1.
• progressive_maxSubdivs - Use between 60 and 100.
• progressive_threshold - Similarly to dmc_threshold, start at 0.005 and reduce if noise persists. Don't go below 0.001.
• progressive_maxTime - This is a render time limit in minutes, so unless you want a safety limit, leave it at 0.

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• meters_scale - Multiplying scene sizes by this value should yield object sizes in meters.
• photometric_scale - Scale for photometric lights.
• seconds_scale - When doing animation, this is the reciprocal of the framerate
• scene_upDir - This needs to be set if the scene has an up-axis different from the default, which is +Z.
• rgb_color_space - Affects Sun/Sky color, color temperatures and dispersion in refractive materials.

6.7. Physical camera

Although the name doesn't hint at it, the CameraPhysical plugin is a settings plugin (singleton). It modifies the way camera rays are shot for effects like DoF (depth of field) and distortion and how they are integrated into the image - exposure. The position and orientation of the camera is still defined by RenderView. Many of the parameters are exactly the same as on a real world DSLR or video/movie camera.

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