cam:position, direction, and up vector of the camera
fog:homogeneous global background fog
spp:samples per pixel
envmap:filename of the environment map, 2:1 aspect latitude/longitude, .hdr preferably 8k
cam mode:use custom camera in this module, or grab camera, simulation time, and fog from another module
cam_mod:if cam mode is set to another module, this is the other module's name
cam_inst:if cam mode is set to another module, this is the other module's instance
sampler:choose which path space sampler to use for rendering: path tracing/env-nee, markov chain path guiding
wd:width of the render in pixels
ht:height of the render in pixels
