FOV question...

JackHiggins · Post #1by **JackHiggins** » 25.12.2002, 23:50

When celestia starts up the default FOV is 45 degrees- is this the same as if you were actually standing in that point in space looking at whatever in real life? or, (to put it another, much simpler way) what is the FOV for a normal person looking at something?!!

Also, on a completely unrelated subject-

:!:

Happy Christmas everyone!!!

Hope santa brought you all what you wanted... :wink:

Post #2by **granthutchison** » 26.12.2002, 01:36

JackHiggins wrote:When celestia starts up the default FOV is 45 degrees- is this the same as if you were actually standing in that point in space looking at whatever in real life?

Your field of view is wider than that, but the Celestia image on your monitor doesn't fill the whole of it - so the realism depends on how close you sit to your monitor.
Measure how wide Celestia is on your monitor, and divide by 0.828 - that's how far away your eyes would have to be to make the Celestia image occupy 45 degrees of your visual field. I sit a good bit farther back than that, so the image is a little small for me.

Grant

FaLLeN_SOuL · Post #3by **FaLLeN_SOuL** » 26.12.2002, 17:15

I have also a question. Could Chris or somebody else who is working on Celestia include a "Hubble View Mode"? So that the FOV will be set to that which Hubble has. Because even the smallest FOV seems not to bring up the same images like Hubble. For example, I would like to see the V380 Ori star including the nebula that Rassilon made from the view of Hubble Space Telescope.

JackHiggins · Post #4by **JackHiggins** » 26.12.2002, 20:28

Thanks for that Grant- where did you get 0.828 from?

Some sort of telescope view mode or a hubble view would be good as well actually - recreate famous images yourself!

Post #5by **chris** » 26.12.2002, 20:41

FaLLeN_SOuL wrote:I have also a question. Could Chris or somebody else who is working on Celestia include a "Hubble View Mode"? So that the FOV will be set to that which Hubble has. Because even the smallest FOV seems not to bring up the same images like Hubble. For example, I would like to see the V380 Ori star including the nebula that Rassilon made from the view of Hubble Space Telescope.

Part of the problem is that a current limitation of Celestia unrelated to FOV prevents the nebula from being visible when the camera is more than one light year away from it. Once I fix this, you should be able to recreate telescopic views of the object.

There is also a limit on the smallest FOV that's due to single-precision arithmetic, but I doubt that you're running up against it yet.

--Chris

Post #6by **granthutchison** » 26.12.2002, 20:52

JackHiggins wrote:Thanks for that Grant- where did you get 0.828 from?

Bit of trigonometry: 2*tan(22.5 degrees)

Grant

Redfish · Post #7by **Redfish** » 29.12.2002, 14:39

While working on that Chris, could you also fix the huge slowdown when zooming in with FOV? Sometimes i have to wait for 5 seconds for the next level to show up. It's really slow when using smaller FOV's.

And i think i got an okay cpu with 1800+ 512MB and gf4 ti 4600.