File:Moon rotating full VEx5.ogv
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Moon_rotating_full_VEx5.ogv (Ogg Theora video file, length 16 s, 512 × 512 pixels, 3.73 Mbps, file size: 7.12 MB)
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Summary
[edit]| Description |
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. The rendering uses vertical exaggeration such that the elevations are amplified by a factor of 5 to make the craters more visible. |
| Date | |
| Source | Own work |
| Author | Geek3 |
| Other versions |
|
Source Code
[edit]
This image was created with POV-Ray.
This image was created with ImageMagick.
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 +H512 +W512 +UA +AM1 +A0.03 +R6 +KI0 +KF1 +KC +KFI1 +KFF400 +Oframe Moon_rotating_full_VEx5.pov
Assembling the gif animation with ffmpeg:
ffmpeg -i frame%03d.png -r 25 -q:v 7 Moon_rotating_full_VEx5.ogv
Source file Moon_rotating_full_VEx5.pov:
// Moon_rotating_full_VEx5.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 "elevation.jpg" map_type 1 interpolate 2
}
}
}
#declare rs=0.03; // ratio of roughness to radius, original 0.006
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]I, the copyright holder of this work, hereby publish it under the following license:
This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
- 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.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:53, 16 April 2017 | 16 s, 512 × 512 (7.12 MB) | Geek3 (talk | contribs) | {{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 one side is visible, but... |
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