low medium high ultra high precision  2⁰ 2² 2⁴ 2⁶ 2⁸ 2¹⁰ 2¹² 2¹⁴ spp
8 16 32 64 128 256 512 1024 path depth  2⁻⁴ samples 2⁻² samples 2⁰ samples 2² samples 2⁴ samples 10 fps 20 fps 30 fps 40 fps 50 fps MIS (beta) 
box sphere clip  no linear log field closed  y-up 
no ResUNet 2 (GAN) 2 ResUNet 2 (GAN) ResUNet 2 ResUNet UNet ResNet denoise no ACES Filmic Reinhard Uncharted 2 tonemap 
scale

default normal gradient color 
grid  highlight discontinuity
opacity  ior 
roughness emit
metallic tint
absorb emit[v]
scatter aniso

brightness contrast
roughness emit
metallic ior tint
absorb depth 
  hue  chroma 
  emit[v] 
scatter aniso
  depth  sharp 

light θ  φ 
intensity  sky 
ambient  soft  hard 

fov  exposure 
roll  distortion 
focal  aperture 
shape  rotate