Setting up your own dome using Stellarium's spheric mirror distortion feature
m (fix y/z coordinate in description)
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People interested in building their own planetarium can subscribe to a
People interested in building their own planetarium can subscribe to a .
Revision as of 05:05, 5 September 2006
In the following section I want to describe how you can build your own planetarium using stellariums spheric_mirror distortion feature.
What you need:
- A dome. The dome should have a spherical inside. I suppose you can have good results with any dome larger than 2m in diameter, perhaps even with smaller ones.
- A spherical security mirror. I recomment a 1/4 mirror, thats a quarter of a sphere. Something like 0.4 or 0.5m in diameter should be ok, for small domes you may need smaller mirrors, decide for yourself.
- A video projector
- A computer running a current verion of stellarium.
In the following example I assume a dome with 5m diameter and a spheric 1/4 mirror with radius 0.25m. I suggest the following config.ini settings:
[spheric_mirror] projector_gamma = 0.45 projector_position_x = 0 projector_position_y = 1 projector_position_z = -0.2 mirror_position_x = 0 mirror_position_y = 2 mirror_position_z = 0 mirror_radius = 0.25 dome_radius = 2.5 zenith_y = 0.125 scaling_factor = 0.8 ... flag_gravity_labels = true ... flag_menu = false
You should be familiar with the keys because there will be no menu exept the tui. When you start stellarium press "PgDown" to get maximum FOV and "CursorUp" in order to look at the zenith. Press "z" 2 times in order to display the azimuth grid. Press "1" in order to get the config window. In the video settings choose the spheric_mirror distortion.
Install the spheric mirror inside the dome. Imagine a coordinate system that is centered in the dome center. The z-axis points upward to the zenith and the y-axis points to some point on the horizon. Look into the direction of the y-axis. Now the x-axis points to a point on the horizon which is near your right hand. In the above config.ini example I suggest that the center of the spheric mirror is at (0,2,0) (I use meters, but feel free to use any units you like).
I hope you will be satisfied with the results. Please send pictures of your new planetarium!