SRTM Viewer

Krzysztof Boroński

Command-line argumets

You can start he program with no arguments or provide a path to a folder containing .hgt data files, followed by some of these options:

• -dl <min> <max> - use data only from tiles lying between <min> and <max> longitudes.
• -sz <min> <max> - use data only from tiles lying between <min> and <max> latitudes.

Note that latitude is always a positive number, 0 is the north pole.

Controls

Press TAB to switch between orthogonal and perspective modes (the program starts in orthogonal mode). Press ENTER to activate command prompt. Press ESC to exit.

In orthogonal mode:

• Hold Z and drag your mouse pointer too zoom-in/zoom-out.
• Hold SPACEBAR and drag your mouse pointer to move the view.

In perspective (geosphere) mode:

• Use W A S D to move around geosphere.
• Look aroung using your mouse.

Runtime commands

Press ENTER to activate command prompt. The following commands are supported:

• load-data [path] <minlon maxlon minlat maxlat> - lods data from [path] folder. Optional arguments sequence <minlon maxlon minlat maxlat> determines longitude and latitude ranges for which the tiles should be loaded. Note, that any previously loaded data will be gone after this operation.
• goto [coordinates] - navigates to given coordinates in orthogonal view. The coordinate format is the same as in .hgt file naming convention, eg.: N45E2. The order in which longitude and mognitude are provided as well as capitalization of letters does not matter.
• set-light-amount-ortho [value] - sets the amount af applied lighting in orthogonal view mode.
• set-light-amount-perspective [value] - sets the amount af applied lighting in perspective(geosphere) view mode.
• set-light-direction-ortho [x y z] - sets light direction vector in orthogoal view mode.
• set-light-direction-perspective [x y z] - sets light direction vector in perspective (geosphere) view mode.
• set-lod-factor - sets an Level-Of-Detail factor (this applies only to perspective mode). 0 is the lowest, 1 is default.
• set-sky-mode [mode] - sets sky rendering mode: color - single color (glClearColor), perlin - weird sky texture based on 3d perlin noise.

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Note: In the provided code the meanings of terms "longitude" and "latitude" are swapped. I always confuse them with each other.