Advanced search
Registered users
Username:

Password:

Log me on automatically next visit?

» Forgot password
» Registration
Random image

High Alpine
High Alpine
Comments: 0
Horo

28.03.2024, 22:14








Google ads below

      

    


Moonbase
Moonbase

            

Moonbase
Description: The bases Plaskettt-Green 87?N/170?W and Plaskett-Blue 84?N/150?W are separated by 80 km / 50 mi and are 8 km / 5 mi wide each. They are at 500 km / 300 mi distance. We approach the bases from the far side of the moon, moving towards the north pole. The star at the horizon in the middle of the right window is Meissa in the constellation Orion, the one just left of the vertical window division is 61 Orionis. The bright star about in the middle of the left window is Alhena in Gemini: a lot of Nightst4rs. Unfortunately, the Earth is below the horizon and cannot be seen.

The randomly set high-tech double-optics magnifyer x 9 catches an approaching antigrav-spherule which came up from the Earth side speeding to another base due south on the far side.

The magnifyer was the most demanding. The shadow at the right side revealed that it was not fixed to the window cross. Since this is in a sphere, it had to be slanted as well and finding the far point where it is focused to was hard to find. The windows of the spherules are glass (index 1.53) except for the one we are sitting in. Due to the curvature, the outside got magnified, so I had to resort to an index of 1 (100, air).

The moonscape is from a DEM (digital elevation map), just added a bit of noise. Everything is thus plausible, except, of course, the artefacts -- quite render intensive.
Added by: Horo
Keywords: moonbase, moon, DEM, magnifyer, Horo
Date: 07.07.2004 22:39
Hits: 3610
Downloads: 160
Rating: 4.00 (2 Vote(s))
File size: 129.6 KB
Previous image: Eyam



Author: Comment:
davidbrinnen
Admin

Join Date: 01.03.2004
Comments: 2224
Facinating stuff

Interesting from almost every angle. On the subject of which, I have found that even a flat 2d plane of glass if it has refractive index of anything greater than on it magnifies the scene if you put it in front of the camera - which isn't right - must be some kind of bug. Where did the DEM come from? That sounds like a useful sort of resource - took me quite a while to model my crater in the terrain editor for a variation of heavens gift - (on my website.) Could do with some Jules Vern style controlls and maybe a few guages and valves around the window? Very good.
07.08.2004 16:40 Offline davidbrinnen mail at davidbrinnen.co.uk http://www.davidbrinnen.com
Horo
Admin

Join Date: 05.26.2004
Comments: 4721
Magnifier and DEM

Thanks for your comment, it's always appreciated. I just come here after a few optical experiments: You're absolutely right, it's not the curvature but the breaking index. This might come in handy once, it's simple to calculate. The index / 100 gives you the mag directly. 4 flat 2D transparents between the camera and the object with each an index of 3 (300) gives 3x3x3x3=81. Compared a tree at 600 from the camera and 48600 and they look almost the same in size. And an index of 0.1 (10) makes the object a 10th of the size. The density of haze could thus be controlled.

Free DEMs are always a bit difficult to find at a good resolution. Here, I used the northpole from ftp://webgis.wr.usgs.gov/moon/usgs/topo/ (25 MB), the southpole has 30 MB and don't get the global (170 MB) because the resolution is worse then lousy.

Yeah, a bit of Tonkin-kind detail would have added some spice. I thought that too. I've still not mastered patience to the extend I wish.
07.08.2004 17:32 Offline Horo h.-r.h.wernli at bluewin.ch https://www.horo.ch/


Previous image:
Eyam  
 Next image:
Derbyshire in the snow

 

 
[Discord Server] 

Powered by 4images 1.9   Copyright © 2015 4homepages.de

Template © 2002 www.vierstra.com