Rayfront 1.0 User Manual

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Edit Location Properties

The Location

Every project needs information about where on the world it is located. This information is used later to determine the brightness and position (azimuth and elevation) of the sun at specific times of the year and the day. The brightness distribution of the sky is then determined as a function dependent of the sky position. No simulation can currently be run without this information, so it is a good idea to fill it in right at the start.

Name of Location
This is the name of a place that can be used to communicate the location to people. It is not directly used in simulations, except in human readable comments in output files and as a search key when looking up locations in the internal database.

This button offers to select a location from a database of many cities worldwide. Selecting a location this way will automatically set the coorinates below to the correct values of the location.



The longitude is the angular east-west position of a place relative to the Town of Greenwich near London (UK). Positions east of Greenwich have positive values, west of Greenwich negative. Values go from -180 degrees to +180 degrees.

The latitude is the angular distance of a place from the equator, with positive values north and negative values south. Points on the equator have a latitude of 0 degrees, the north pole is at +90 degrees and the south pole at -90 degrees.

The timezone defines how the clocks are running at a specific location. The official timezones are usually set in steps of one hour (or half a hour in some exceptional cases). Again, positive values designate timezones east of Greenwich (up to 12 hours) and negative ones west (up to -12 hours).
One hour of timezone corresponds to 15 degrees of latitude. This means that if the longitude is eg. -122.04 for Berkeley CA, then the timezone will most likely be near -8 hours, locating the standard meridian for California at -120 degrees. If the timezone entered is more than 3 hours away from the solar time of the longitude, then you will see a warning when closing the dialog, with the possibility to go back for correction.

Notice: Users located in America will notice that the signs of longitude and timezone are exactly reverse to what they are used to. Since Rayfront is written for a global audience, we chose to follow international standards here, which specify that longitude values east of Greenwich are positive, and west of Greenwich negative.


Model X-Axis Deviation from East:
Your geometry model may not be aligned exactly to it's designated north/south orientation for practical reasons. If this is the case, then you should enter here by how many degrees the X-axis deviates from the east direction (which is the same as Y from north). This makes sure that the sun will shine from the right direction in the simulations. The diagram gives immediate feedback on the effect of the angle entered.


Ok - use the entered values and close the dialog.

Cancel - discard the entered values and close the dialog.

Revert - discard the entered values and reset all fields to the values they had when the dialog opened.

Help... - display this information.


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