Kuben in Halo 3

[Victor]

Hallo!
Mit dem Programm Halo 3 von Cowley und Schroeder kann man selbst Kristalle programmieren. Ich habe einen Würfel mit dem Text aus der "Hilfe" programmiert, also nichts besonders schwieriges.
Nun meine Frage: Kubische Kristalle wurden doch zur Erklärung eines chilenischen Phänomens mit einem 12°- Ring herangezogen ( neuerdings aber anscheinend wieder verworfen), d. h. die entsprechenden Austoren müssen doch Modellrechnungen mit Kuben gemacht haben und einen 12°- Ring erzeugt haben. Wenn ich jedoch eine Simulation mit Kuben durchführe erhalte ich nur den 46°- Ring. Das kann doch gar nicht sein. Wenn ich dann den ( vermeintlichen) Kuben eine Orientierung gebe entstehen Supralateralbogen, Infralateralbogen, Circumzenitalbogen, parhelischer Ring, Gegensonne und 46°- Nebensonnen (!), aber kein anderer Ring.
Weiß irgendjemand, was da falsch läuft? Ist der Würfel- Programnm- Text fehlerhaft?
Bei der Gelegenheit habe ich noch eine andere Frage zu Halo 3: Warum werden Farbsimulationen mit 128 Bit bei mir nur grün und solche mit 256 Bit werden gar nichts? Liegt das an meinem Rechner?
Ich danke Euch schon mal für Antworten und wünsche Euch noch einen schönen Abend.
Victor

[Michael Ellestad]

12 degree ring is that true? *o.T.*

[Les Cowley]

Hello Victor,

HaloSim3 will produce a 46º halo with a cube. However, the term "cubic crystals" can also mean crystals of cubic symmetry - these include cubes, octahedra, cuboctahedra and so on. See http://www.sundog.clara.co.uk/halo/owco2xt.htm . These other crystals will produce other circular halos and arcs. if you want these crystals I can send some files.

I'm sorry but I don't understand the question about colour levels. Can you try rephrasing please .

Hope this helps. Les

[Victor]

Hello Les,
thank you very much for your answer, that'll help me.
I would be very glad, if you were able to send me these files. I really enjoy Halo 3 and I'm always discovering new interesting features.
I'll try to translate my question about colour simulations:
When I start a simulation with 128 levels the halos are of a pure green. Interesting, but not desirable. When I start a simulation with 256 levels nothing happens, no halo occurs. Does my computer the simulations wrong, or what's the case?
Thank you again
Victor

[Victor]

Hello Michael,
yes there is an 12° halo. As far as I can remember it was observed for the first time during a display in Chile. The finnish scientist M. Riikonen correlate this halo to cubic crystals. But in december 1998 Jarmo Moilanen observed this and another rare circular halo ( 6° halo) at south pole. Moilanen explains the 12° halo as a possible result of coincidence of two different halos with radii of 11,2° and 11,8°, which are caused by double pyramid crystals.
Bye
Victor

[Les Cowley]

Victor,
I will mail you a 'package' of cubic crystals some time
this weekend (I have to find them!). They were used to
simulate CO2 Martian halos but they will work fine for
cubic water-ice if you use the ordinary refractive index.

> When I start a simulation with 128 levels the halos are of a
> pure green. Interesting, but not desirable. When I start a
> simulation with 256 levels nothing happens, no halo occurs.

OK. I think maybe that the display settings for your
monitor need to be changed. To make effective use of a
colour/level depth of 256 you need a display setting of
"true color 32 bit". It could be that you currently
have 256 colors set?

Les

[Les Cowley]

Victor,I have mailed files to you at [ victor_groenke@web.de ]

[Michael Ellestad]

> Hello Michael,
> yes there is an 12° halo. As far as I can remember it was
> observed for the first time during a display in Chile. The
> finnish scientist M. Riikonen correlate this halo to cubic
> crystals. But in december 1998 Jarmo Moilanen observed this and
> another rare circular halo ( 6° halo) at south pole. Moilanen
> explains the 12° halo as a possible result of coincidence of two
> different halos with radii of 11,2° and 11,8°, which are caused
> by double pyramid crystals.
> Bye
> Victor

Victor,

As far as I remember the halo seen in chile were 28 degree halo and its arcs and 19 degree arcs and yes 6 and 12 degree rings were seen at south pole and in that same display a possible 28 degree halo.

BTW: I am also a halo observor and I have a webpage if you want to see it the link is www.geocities.com/bowlturner/my_weatherpics.html

When you ge to my page you will find halos, sunsets, rainbows, diffraction phenomenan and my tornado generator for those who like tornadoes.

Best,
Michael

[Michael Ellestad]

I still have them les I could send them if you can't find yours *o.T.*