In the tutorial, the usage of the terms Depth and Disparity are somewhat confusing. Please clarify.
https://docs.luxonis.com/en/latest/pages/tutorials/first_steps/
depth -- Shows disparity map calculated from depthRaw
preview and JET colored. Best for visualizing depth
-- is this depth or disparity? It is named 'depth' but says 'shows disparity map'. Why would it be calculated from depthRaw when depth is normally calculated from disparity (the other way around)?
depthRaw -- Shows raw depth map. Best for depth-based calculations
-- is this depth...or does it need more 'calculations'? Can I use the intensity of the pixels to determine depth?
It seems that 'Use Disparity' moves some calculations onto the Oak device to save resources on the computer? But then the rawDepth option disappears. So I can't get depth if I am having the Disparity computed on the device?
It seems weird to be able to move disparity calculations to the device and then lose the depth info. Is this available via the API?
disparityColor -- Shows disparity map produced on device and JET colored. Should be the same as depth preview but produced on the device.
-- they are not the same...why not? ( see image below )

The 'Bilateral Sigma' option is not mentioned in the tutorial. What is it?
The 'Confidence Threshold' option is not mentioned in the tutorial. What happens if something pertaining to depth/disparity does not meet the threshold? Is it given a near distance or a far distance?