Celestia Forums

There are books about early life that is based on Clay http://www.chem.gla.ac.uk/~bobh/agcs.html Dr. A. Graham Cairns-Smith wrote a book that I read called: Seven Clues to the Origin of Life (1985) The book defines life and it describes clay that fits the definition of life. Mutations in clay crysta...

Hi Cormoran, I have confirmed that Scytale is right. Using a circle in the x,y plane, think of two vector velocities Y1 and Y2. The first one points up the y axis. The second velocity points to the right z radians, where z = Z*pi/180. Then the change in the y coordinate is Y(1-cos(z)). The change in...

It looks very good. I checked a paper Atlas of the Chesapeake Bay and at the scale shown on your images, everything matches very well. There will always be swamps and tidal flats that are variable. Some flat lands may be dry in one year, and they will be wet in other years. After a heavy rainstorm, ...

Hello t00fri, I was glad to see that you did not find any problems with accuracy in the SRTM files. If I worked on this big specular map, I would write custom software using the Perl language. This program would open hundreds of input files in .shp format and write into one big output file in a bitm...

Hi Cartrite, I looked at the two links you found and they look great. For $60 you can buy a DVD with what you need. It seems to cover most continents. You need software to read ESRI shapefiles. The documentation says : "This document provides a description of the content, format and accuracy specifi...

Hello Celestians, I wrote five science fiction stories this Spring while I have been away from your nice forums. The one that I am showing you today is called: The Balloons of Venus The length of the story is 7000 words. I submitted it to a magazine for publication, but it was rejected. I can make c...

Hi Hunter, I enjoyed reading your short story. Do you make it up while you are writing it or plan it out first? You can publish short stories easily in three magazines. They will pay $0.05 per word. The story can be as short as 700 words or up to 80,000 words. The names of the magazines are : Analog...

The following answers should not be considered as authoritative. These comments are based on a book called Introductory Nuclear Physics by Hodgson, pages 570 to 575. Stars make nitrogen by fusing carbon and a proton. C12 + p => N13 + gamma N13 => C13 + e + neutrino C13 + p => N14 + gamma That is how...

Hello Liar, if that is your real name, The old models had the rotation directions wrong, so that is what Chufty was talking about. THe present models have this corrected so Mars and Earth both have the Sun rising in the East. Venus rotates in the correct retrograde direction for the .cmod model you ...

Hello Quan, Your questions are pleasant ones which show that you are already on the right track. Your entry into the study of physics next semester is a good start. The gravitational field has values dermined by energy density as well as matter. So it may be fruitful to concentrate energy rather tha...

The Celestia Motherload now has all six models of planets that I made, with texture mapping added by jestr. http://www.celestiamotherlode.net/catalog/solarsystem.php They can be downloaded from the Solar System page. They are called : Venus 1x Venus 200x Earth 1x Earth 200x Mars 1x Mars 200x These 3...

Congratulation Cartrite! You are doing valuable work. CMOD format has the advantage over .3ds format because it gives smoother models without the seams from .3ds. When I convert .stl files to .3ds files with Accutrans3D, the model is broken up into several sections, leaving ugly seams between model ...

Hi Cartrite, Your program did not have enough comments for me to understand it. So let's get to the preliminaries : You can get a spec on CMOD format. You can get a spec on Blender format You can post one rectangle data in Blender format. I never used Python, but it seems you left out parentheses. I...

Hello Cartrite, Please start small. You can start with the tiny prism I donated earlier on this list. That will show you all you need to know to make big objects with thousands of faces. Or make your own tetrahedron to start small. A minimal object will teach you the basics first. Each face is a tri...

Hello hharris, You asked for someone who is active in planet generation. That is me. What do you want to do with planets? Here is my latest work on Mars 3D. This picture shows 3 levels of resolution from left to right : 8 points per degree, 4, and 2 points per degree. http://www.reliefglobe.com/Mars...

Check it out...

http://www.celestiaproject.net/forum/viewtopic ... b7a37c53c7

Hi Cartrite, Here is a tiny example of a prism with 5 sides. You can see a picture of the prism and download the .3ds version here: http://www.celestiaproject.net/forum/viewtopic.php?t=8501&sid=6b3afba14f49411b5ed503b7a37c53c7 #celmodel__ascii material diffuse 1 1 1 end_material mesh vertexdesc ...

Hi Don, You said, "Also in the third shot, with snow on it is a very seldom seen volcano that is just east of Hellas. I knew it was there but with a dusting of snow it sure is visible now." That seldom-seen volcano is called Tyrrhena Patera. The rough southern hemisphere only has three big volcanoes...

The missing stars can be seen in the picture I posted in this thread : http://celestiaproject.net/forum/viewtopic.php?t=3615&start=75&sid=8b39e138d7944d1f67fbaaf1c2603ae3 The thread is called "Post Bugs Here", page 6 on Jan. 5, 2006 Here is the picture of the zone near Earth in the Milky Way...

You can download a .zip file of a .3ds model of Mars with a very detailed part of Valles Marineris merged with a coarse-grid planet Mars. Most of the planet has 2 data points per degree of latitude and longitude, but the Park has 128 data points per degree. That is the finest topo detailing availabl...