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A raytracer for panoramas using real-life elevation data
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README.md

Atmospheric Raytracer

What is it?

It's a utility for generating panoramas out of elevation maps. You input a set of elevation maps in the DTED format, latitude and longitude of the viewing location, viewing altitude, direction, field of view, and it generates a panorama in the PNG format.

It was created as a means for debunking flat-earthers' arguments, so it supports generating panoramas as they would look if the Earth was flat, as well. Thanks to this feature, you can simulate a view of a specific location, compare it to actual photos and see which model fits better ;)

Usage

Typical usage would be:

  1. Download some DTED elevation map files, for example from https://earthexplorer.usgs.gov/
  2. Put the DTED files in a single folder
  3. Run cargo run --release -- PARAMETERS, where the parameters are:
  • -t, --terrain PATH - path to a folder containing files in DTED format

View options:

  • -a, --alt ALT - viewpoint altitude in meters ASL
  • -l, --lat DEG - viewpoint latitude in degrees
  • -g, --lon DEG - viewpoint longitude in degrees
  • -d, --dir DEG - viewing direction azimuth in degrees (0 = north, 90 = east etc.)
  • -e, --elev DEG - viewing direction elevation in degrees; 0 means the observer's eye looks horizontally, -1 is one degree below horizontal etc.
  • -f, --fov DEG - horizontal field of view in degrees (the vertical FOV is scaled based on the output image width and height)
  • -m ,--maxdist DIST - cutoff distance - objects further than this won't be visible

Simulation environment options:

  • -R, --radius RADIUS - the Earth's simulated radius, conflicts with --flat
  • --flat - simulate a flat Earth; conflicts with --radius
  • --atmosphere PATH - path to a file describing the atmosphere configuration; to be documented
  • -s, --straight - propagate light rays along straight lines (by default the rays are bent according to the atmospheric temperature and pressure)
  • --step STEP - when simulating a light ray, a single simulation step will be by this many meters

Output options:

  • -o, --output PATH - the resulting image will be saved under this name
  • -w, --width PIXELS - the output image width in pixels
  • -h, --height PIXELS - the output image height in pixels
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