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4.4. VIDEO MODE SETTINGS
CHAPTER 4. CONFIGURATION
4.4 Video Mode Settings
Figure 4.4: Setting up the video mode
The Video tab in the configuration window (figure 4.4) offers the following setting options:
Projection Selecting items in this list changes the projection method which Stellarium
uses to draw the sky. Options are:
perspective Perspective projection keeps the horizon a straight line. The maximum
field of view is 150◦. The mathematical name for this projection method is
gnomonic projection.
orthographic Orthographic projection is related to perspective projection, but the
point of perspective is set to an infinite distance. The maximum field of view is
180◦ .
equal area The full name of this projection method is, Lambert azimuthal equalarea projection. The maximum field of view is 360◦.
fisheye Stellarium draws the sky using azimuthal equidistant projection. In fisheye projection, straight lines become curves when they appear a large angular
distance from the centre of the field of view (like the distortions seen with very
wide angle camera lenses). This is more pronounced as the user zooms out.
The maximum field of view in this mode is 180◦
stereographic This mode is similar to fish-eye projection mode. The maximum
field of view in this mode is 235◦
cylinder The full name of this projection mode is cylindrical equidistant projection.
The maximum field of view in this mode is 233◦
Disk viewport This check-box, when selected, adds a black circular border around the
main view. Using the zoom functions to set the field of view, it’s possible to simulate
looking through binoculars or a telescope eyepiece - useful if you want to know how
much of a constellation you can see at once with a given instrument.
Viewport Distorter This is a special modifier to the projection mode intended for use with
a projector and a spherical mirror. With this set up it is possible to create a low-cost
projection system for making a small planetarium.
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