Celestia Forums

There are no moons in any of my images.

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

https://imgur.com/a/iJcVme7

I skipped step 7, above, however.

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...

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 ...

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!

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...

Why? Things are fine the way they are now.

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!

Here you can see example output.

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.

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...

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...

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...

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...

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...

Just out of curiosity, how does a program like Celestia overcome these issues?

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.

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.

Yeah, it's too bad.

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.