File:Moon rotating full 160px.gif
Moon_rotating_full_160px.gif (160 × 160 pixels, file size: 1.56 MB, MIME type: image/gif, looped, 120 frames, 4.8 s)
Captions
Summary[edit]
DescriptionMoon rotating full 160px.gif |
English: Animated rotation of the earth's moon. The lit side of the full moon is shown, as an observer looking from the sun's direction would see it. On earth, only one side is visible, but the moon rotates relatively to the sun during one month. In order to render the animation of a full rotation, images from spacecraft beyond the moon had to be used. At the terminator near the right edge, craters can be seen most clearly. This is a small version suitable for display in Wikipedia. |
Date | |
Source | Own work |
Author | Geek3 |
Other versions |
|
Source Code[edit]
The frames of the animation were created with POV-Ray, a free 3D rendering program. Two components are required:
- A surface color map, free image from NASA's 1994 Clementine mission.
- An elevation map (from USGS, public domain) with grey values encoding surface altitudes. The elevation map can be used as a simple bump map for fast rendering, or (as in this case) to reconstruct a full 3D model with realistic shadows.
Executing POV-ray rendering:
povray +H160 +W160 +UA +AM1 +A0.03 +R6 +KI0 +KF1 +KC +KFI1 +KFF120 +Oframe Moon_rotating_full_160px.pov
Assembling the gif animation with ImageMagick:
convert -loop 0 -delay 4 -dispose background frame???.png -channel alpha -threshold 50% +channel +dither -colors 64 Moon_rotating_full_220px.gif
Source file Moon_rotating_full_160px.pov:
// Moon_rotating_full_160px.pov
#version 3.7;
#include "colors.inc"
global_settings { assumed_gamma 1 }
camera { location <0, 0, -220> look_at <0, 0, 0> up 0.00526 right 0.00526 }
light_source {
<0.3,0,-1> * 200
color White
}
// use true 3D surface
#include "functions.inc"
#declare ele=function{
pigment{
image_map{
jpeg "moon_elevation.jpg" map_type 1 interpolate 2
}
}
}
#declare rs=0.006; // ratio of roughness to radius
isosurface {
function { f_sphere(x,y,z, 1) + rs * (1 - ele(x,y,z).gray) }
contained_by { sphere {0,1.01} }
accuracy 0.00001
max_gradient 1.2
texture {
pigment {
image_map { jpeg "moon_surface.jpg" map_type 1 } }
finish {
ambient rgb 0.006*<1,1,1> // space is dark
diffuse 1.4 // brightness
brilliance 1.0 // seems most realistic
}
}
scale <1,1,-1>
rotate <0,-90+360*clock,0>
translate <0,0,0>
}
Licensing[edit]
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 00:09, 23 March 2016 | 160 × 160 (1.56 MB) | Geek3 (talk | contribs) | == {{int:filedesc}} == {{Information |Description ={{en|1=Animated rotation of the earth's moon. The lit side of the full moon is shown, as an observer looking from the sun's direction would see it. On earth, only on... |
You cannot overwrite this file.
File usage on Commons
The following 3 pages use this file:
File usage on other wikis
The following other wikis use this file:
- Usage on ca.wikipedia.org
- Usage on de.wikipedia.org
- Usage on es.wikipedia.org
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
GIF file comment |
|
---|