Posts by posfan12

by posfan12
11.06.2019, 21:16
Forum: Physics and Astronomy
Topic: How to calculate planet rotation/orientation
Replies: 4
Views: 2256

Re: How to calculate planet rotation/orientation

There are no moons in any of my images.
by posfan12
27.09.2018, 22:50
Forum: Physics and Astronomy
Topic: How to calculate planet rotation/orientation
Replies: 4
Views: 2256

Re: How to calculate planet rotation/orientation

Here are some comparisons showing that my math is somehow wrong.

https://imgur.com/a/iJcVme7

I skipped step 7, above, however.
by posfan12
27.09.2018, 21:46
Forum: Help Central
Topic: Script to follow planets
Replies: 2
Views: 2114

Re: Script to follow planets

I have created these four scripts. Three of them work properly, in that the ecliptical reference frame markers are all at right angles to the camera/screen. But the script for Mars adds a bit of extra rotation, such that the blue Z axis reference frame marker is rotated slightly to the "forward...
by posfan12
25.09.2018, 03:45
Forum: Help Central
Topic: Script to follow planets
Replies: 2
Views: 2114

Script to follow planets

I am just starting learning how to script Celestia. I am trying to place the camera above the Earth, looking directly down on it. However, instead of sitting above the Earth's North Pole, I want to be oriented with the parent frame. In other words, the camera should be perpendicular to the XY plane ...
by posfan12
24.09.2018, 02:02
Forum: Development
Topic: Calculating planet rotations
Replies: 0
Views: 3734

Calculating planet rotations

I wasn't sure where to post this, but could a developer please take a look at this thread and maybe answer a few questions?

viewtopic.php?f=7&t=18290

Thanks!
by posfan12
24.09.2018, 01:50
Forum: Physics and Astronomy
Topic: How to calculate planet rotation/orientation
Replies: 4
Views: 2256

How to calculate planet rotation/orientation

I am creating a POV-Ray scene to model the Solar System: http://lib.povray.org/searchcollection/index2.php?objectName=SolarSystemOrrery&contributorTag=SharkD Using this PDF I was able to plot the planet positions: https://ssd.jpl.nasa.gov/txt/aprx_pos_planets.pdf However, now I want to rotate/or...
by posfan12
24.09.2018, 00:58
Forum: Physics and Astronomy
Topic: Will Pluto be a planet again?
Replies: 3
Views: 1867

Re: Will Pluto be a planet again?

Why? Things are fine the way they are now.
by posfan12
24.09.2018, 00:32
Forum: Help Central
Topic: Show pole axis and prime meridian?
Replies: 0
Views: 3196

Show pole axis and prime meridian?

Is it possible to mark the pole axis and prime meridian of a body? Thanks.

Added after 4 hours 30 minutes:
I just found the "Show Body Axes" option, which is a good enough substitute. Thanks!
by posfan12
23.01.2011, 01:28
Forum: Development
Topic: Cube or spherical map "screenshots"?
Replies: 11
Views: 7094

Re: Cube or spherical map "screenshots"?

Here you can see example output.
by posfan12
07.07.2010, 23:10
Forum: Development
Topic: Rendering of stars at close-up
Replies: 9
Views: 4934

Rendering of stars at close-up

Are there any plans on changing how stars are rendered at close-up? I don't find their appearance to be very convincing. I know that in some video games if you turn the camera directly at the sun, other objects start looking sort of washed out by the sun's intensity, which is a pretty good effect IMO.
by posfan12
07.07.2010, 19:31
Forum: Development
Topic: Cube or spherical map "screenshots"?
Replies: 11
Views: 7094

Re: Cube or spherical map "screenshots"?

Precise dimensions (although perhaps not the ones you want) can be obtained by selecting "full screen mode", in which case Celestia's window fills the entire screen with no borders. Yes, but as I said my monitor at fullscreen is not particularly big. Its native resolution is only 1366x768...
by posfan12
06.07.2010, 23:18
Forum: Development
Topic: Cube or spherical map "screenshots"?
Replies: 11
Views: 7094

Re: Cube or spherical map "screenshots"?

Looks good! Unfortunately, Celestia is (currently) limited to creating graphics images with the same resolution as the screen that it's using. My understanding is that most 3D realtime graphics controllers can actually draw into "virtual" windows which are larger than the screen, but Cele...
by posfan12
06.07.2010, 20:58
Forum: Development
Topic: Cube or spherical map "screenshots"?
Replies: 11
Views: 7094

Re: Cube or spherical map "screenshots"?

Here's the script: local obs = celestia:getobserver() local image_count = 1; obs:setframe(celestia:newframe("universal")) obs:setfov(math.rad(90)) axis_vector = celestia:newvector(0,1,0) rot = celestia:newrotation(axis_vector, math.rad(90)) for i = 1, 4 do wait(1.0) celestia:takescreenshot...
by posfan12
06.07.2010, 19:54
Forum: Development
Topic: Cube or spherical map "screenshots"?
Replies: 11
Views: 7094

Re: Cube or spherical map "screenshots"?

I got the camera rotations to work using the script you linked to as an example. However, is the FOV setting with respect to the horizontal or vertical screen dimension? Is there a way to limit what is drawn to only what lies within the FOV, and make the rest of the screen blank? [edit] OK, it seems...
by posfan12
06.07.2010, 06:13
Forum: Development
Topic: Cube or spherical map "screenshots"?
Replies: 11
Views: 7094

Cube or spherical map "screenshots"?

Is it possible to take a "screenshot" that is an 2x1 aspect ratio sphere map? Or a cube map composed of six tiled images? Is it feasible to manually set the FOV and camera positions such that taking multiple normal screenshots would result in equivalent images as a cube map? A script maybe...
by posfan12
06.07.2010, 00:41
Forum: Development
Topic: POV-Ray output?
Replies: 2
Views: 1673

Re: POV-Ray output?

Just out of curiosity, how does a program like Celestia overcome these issues?
by posfan12
05.07.2010, 04:58
Forum: Bugs
Topic: Documentation: keyboard chart is illegible
Replies: 1
Views: 1577

Documentation: keyboard chart is illegible

The keyboard chart on the second to last page of the Celestia PDF manual is illegible. Either increase the resolution, or use a vector drawing instead.

And if you're going to keep the bitmap image, then use the PNG format instead of JPG. JPG is for photographs, not glyphs and charts.
by posfan12
04.07.2010, 02:32
Forum: Development
Topic: POV-Ray output?
Replies: 2
Views: 1673

POV-Ray output?

Any thoughts on adding a way to export a scene to POV-Ray? It (in theory) has the capability of producing professional looking results, is free, supports smooth animations and so forth.
by posfan12
04.07.2010, 01:41
Forum: Physics and Astronomy
Topic: HORIZONS help
Replies: 7
Views: 3021

Re: HORIZONS help

Yeah, it's too bad. :(
by posfan12
02.07.2010, 17:41
Forum: Development
Topic: feature request
Replies: 19
Views: 7045

Re: feature request

PNG works well when the image contains large areas where the colors don't change much, such as screenshots of Notepad, simple educational graphics and so forth. In cases where the image is "busy" and contains lots of detail like in a photograph then JPEG is better.

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