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skychart03.png (866,147 bytes) skychart02.png (1,163,887 bytes) skychart01.png (871,453 bytes) |
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Hi Thomas, Yes the FOV range can be extended, but no more than 180° because it make no sens after that. Otherwise the object located in 90°,180° range from the center will overlap those in 0°,90°, like if you look at a transparent sphere. The main problem of this projection is the radial compression near 90° of the center, this is why I limit it to 45° (90° FOV). But this is easy to change, now you can activate SIN for all the FOV range with a maximum smaller than 180°. This is in the daily build: https://vega.ap-i.net/tmp/skychart/ |
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Hello Patrick, I tested the version from the daily build link and created a short video which shows some issues. When using the scroll wheel and change the FOV to approx. 179° (see video) the background turns brown only a half arc is drawn. When clicking on show on "show objects below horizon", and changing the FOV to approx. 179°, the background turns also brown (like all objects below horizon). |
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Just tested it on macOS Sonoma (same problem). Bildschirmfoto 2024-09-04 um 09.38.39.png (521,535 bytes) |
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Right, and there is a lot more of issue at many place in the program, for example horizon picture go in infinite loop. This is because of this projection property to give the same screen coordinates for two different points on the celestial sphere. The only safe approach I see for now is to revert this change. https://github.com/pchev/skychart/commit/2c50dab686c3dd0b32dc99e8a4f95f47a3d95bc1 I am not sure it is worth the effort to try to make it working, specifically given the weird appearance of the stars compressed on each other near the border of the sphere. Maybe it is better to try how a stereographic projection can look? |
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Hello Patrick, I think we can close the issue, I am not sure whether the stereographic projection gives more appealing view to the already implemented projections. Using for fields numbers 1-6 the SIN, and 7-10 the HAI projections looks actually close to the above hack 7-10 SIN. |
- Anonymous
