OnWorks favicon

lightspeed - Online in the Cloud

Run lightspeed in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command lightspeed that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



lightspeed - Shows how objects moving at speeds near the speed of light look like.


lightspeed [-hsa] [object]


Light Speed! is a simulator which can illustrate the effects of special relativity on the
appearance of objects travelling at ultra-high speeds. Depending on the particular speed,
and one's point of view, relativistic effects can cause the object to appear shorter,
longer, brighter, darker, deformed and/or off-color.


To adjust the velocity, use the slider along the right edge of the main window. You can
also type in a value, using the entry at the top right (press <Enter> once it is in). To
change the units shown, press the button to the right of the entry, and it will cycle
through a small list.

The object travels in the positive-x direction, which can be visually checked by
activating Objects -> Coordinate axes.

Most interactive control is performed with the mouse. By holding down a particular button,
and dragging the pointer around, various camera motions can be obtained:

Left button: Revolve camera around view target

Left button + Shift key: Revolve view target around camera

Middle button: Translate camera left, right, up or down

Right button: Dolly in or out

The first and last motions are generally the most useful. Should the camera become
difficult to control at any point, it may be re-initialized by selecting Camera -> Reset


-h, --help
Print this help screen

-s, --simple
Use simplified interface

-a, --advanced
Use advanced interface (default)

object 3D file to load on startup (.3DS or .LWO)

April 2000 LIGHTSPEED(1)

Use lightspeed online using onworks.net services