User talk:TxAlien

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Contents 1 Image copyright problem with Image:Rel04ss.gif 2 Images 3 Re: NASA Images 4 Tachyon animation = awesome 5 Parashute?

[edit] Image copyright problem with Image:Rel04ss.gif

Thanks for uploading Image:Rel04ss.gif. However, the image may soon be deleted unless we can determine the copyright holder and copyright status. The Wikimedia Foundation is very careful about the images included in Wikipedia because of copyright law (see Wikipedia's Copyright policy).

The copyright holder is usually the creator, the creator's employer, or the last person who was transferred ownership rights. Copyright information on images is signified using copyright templates. The three basic license types on Wikipedia are open content, public domain, and fair use. Find the appropriate template in Wikipedia:Image copyright tags and place it on the image page like this: {{TemplateName}}.

Please signify the copyright information on any other images you have uploaded or will upload. Remember that images without this important information can be deleted by an administrator. If you have any questions, feel free to contact me, or ask them at the Media copyright questions page. Thank you. --Hetar 04:52, 6 August 2006 (UTC)

Opportunity, sol 81

Opportunity, sol 74-81

I've made many pictures using NASA raw images. And I'm not sure what license should be applied to them. I changed colors, size and mosaic pictures sometime are not perfect. --TxAlien 01:41, 10 September 2006 (UTC)

[edit] Images

Hi TxAlien. I love your images, but I'm still wondering how they were made. Specifically, what software package did you use to make them? I've always wanted something that could make such nice-looking pictures based on formulas. MOBle 00:04, 10 September 2006 (UTC)

Thank you. I'm using Scientific Notebook for my job, computer algebra, writing articles and so on. It is very nice software. Recently I've got MuPAD. It has more powerful graphics tool and computer algebra, but it is not so simple as Scientific Notebook. A few month ago I've made several pictures in 4d-space just for myself. Some of them were very pretty. So, I decided to put these pictures in Wikipedia. I hope that they will be useful for somebody. I'll be glad to answer any questions about this software. You can download it for one month free trial from

http://www.sciface.com and http://www.mackichan.com/

I can send source code to any image I've made. Or, if it is not too complicated, I can help to make image based on your formulas or (not too big) differential equations.--TxAlien 03:22, 10 September 2006 (UTC)

Thanks. I'd love to see how you did the simple light cone, for example. Do you know if Scientific Workplace can do the same things? I get that for free from school -- not Scientific Notebook, though. MOBle 23:32, 10 September 2006 (UTC)

I meant Lcprojection01.jpg. I much prefer a package that doesn't bother with primitives, but just does a nice job with formulas. Thanks. MOBle 21:35, 11 September 2006 (UTC)

This is MuPAD source code. It is very simple. There are only five different objects.

You can not be able to draw in Scientific Notebook only the arrows X,Y and Z.

All other objects you can easy to make using the latest version of Scientific notebook. It is not too big source code and some of the objects almost the same, they have just a different parameters.

I did not write the source code in notebook because I have only old version of it. And it looks ugly in old graphics. Also, if you do not need my previous answer then I will remove it. --TxAlien 01:39, 12 September 2006 (UTC)

Thanks. That source code is what I'm interested in. MOBle 18:50, 12 September 2006 (UTC)

You are welcome. If you will have any problem with the source code - let me know.--TxAlien 19:07, 12 September 2006 (UTC)

t1 := 0:   // first time for animation
t2 := 4:   // last  time for animation
vm := 1:   // four-velocity of the sphere. 3d velocity is c*vm/sqrt(1+vm^2) = c/sqrt(2)~0.7c
r  := 0.5: //radius of the sphere
xx := r*cos(a)+1: // parametrization of the sphere projection on plane xy 
yy := r*sin(a):   // parametrization of the sphere projection on plane xy
v0 := (v)   -> sqrt(1 + v^2):   // time velocity component
Xl := (v,t) -> v0(v)*xx - v*t:  // Lorentz transfomed coordinates ( )
Tl := (v,t) -> v0(v)*t - v*xx:  // Lorentz transfomed coordinates
xl := (v,t) -> (xx - v*t)/v0(v):// crossing world surface and xy plane
xr := (v,t) -> (xx - t*v)*v0(v)+v*sqrt((xx - t*v)^2 + yy^2):      // projection on xy plane
                                                //  of crossing world surface and light cone. 
                                                // It is visible image of the sphere
tr := (v,t) -> (1+v^2)*t - xx*v - v0(v)*sqrt((xx - t*v)^2 + yy^2):// crossing
                                                // world surface and cone surface
WorldSurf1 := plot::Surface([xl(vm,t),yy,t],
             a  =  0 .. 2*PI,
             t  = -5 .. 0,
             FillColor = RGB::Grey, //.[0.2],
             FillColor2 = RGB::Grey,//.[0.2],
             UMesh = 12,VMesh = 2,USubmesh = 2,VLinesVisible = FALSE):
WorldSurf2 := plot::Surface([xl(vm,t),yy,t],
             a  =  0 .. 2*PI,
             t  =  0.5 .. 4,
             FillColor = RGB::Grey, //.[0.2],
             FillColor2 = RGB::Grey,//.[0.2],
             UMesh = 12,VMesh = 2,USubmesh = 2,VLinesVisible = FALSE):
WorldSurf3 := plot::Surface([xl(vm,t),yy,t],
             a  =  0 .. 2*PI,
             t  =  0.0 .. 0.5,
             FillColor = RGB::Grey.[0.2], // [0.2] is transparency
             FillColor2 = RGB::Grey.[0.2],
             UMesh = 12,VMesh = 3,USubmesh = 2,VLinesVisible = FALSE):
LSphere := plot::Curve3d([xl(vm,0)*1.01,yy*1.01,0],
             a  =  0 .. 2*PI,
             LineColor = RGB::Black):
VSphere := plot::Curve3d([xr(vm,0),yy,0],
             a  =  0 .. 2*PI,
             LineColor = RGB::Red):
VCSphere := plot::Curve3d([xr(vm,0),yy,tr(vm,0)],
             a  =  0 .. 2*PI,
             LineColor = RGB::Red):
PrToConeSurf := plot::Surface([xr(vm,0),yy,tr(vm,0)*p],
             a  =  0 .. 2*PI,
             p  =  0 .. 1,
             FillColor = [1.0,0.4,0.4,0.3],
             FillColor2= [1.0,0.9,0.9,0.3],
             VLinesVisible = FALSE,
             UMesh = 25,VMesh = 2,USubmesh = 2):
QAx := plot::Arrow3d([-4.0,0.0,0.0],[4.5,0.0,0.0],Color=RGB::Black,
                   TitlePosition = [4.6,0.0,0.0],Title = "X",TitleFont = [10,Bold]):
QAy := plot::Arrow3d([0.0,-4.0,0.0],[0.0,4.5,0.0],Color=RGB::Black,
                   TitlePosition = [0.0,4.5,0.0],Title = "Y",TitleFont = [10,Bold]):
QAt := plot::Arrow3d([0.0,0.0,-4.0],[0.0,0.0,4.5],Color=RGB::Black,
                   TitlePosition = [0.0,0.0,4.5],Title = "T",TitleFont = [10,Bold]):
Cone1 := plot::Surface([t*cos(a),t*sin(a),t],
             a  =  0 .. 2*PI,
             t  = -4 .. 0,//tr = 0.2 ..1,
             FillColor  = [0.4,0.4,0.4,0.95],
             FillColor2 = [1,0.25,0.25,0.95],
             LineColor  = RGB::Black.[0.15],
             FillColorDirection = [1,1,1],
             VLinesVisible = FALSE,
             UMesh = 25,VMesh = 2, Submesh = [2,1]):
Cone2 := plot::Surface([t*cos(a),t*sin(a),t],
             a  =  0 .. 2*PI,
             t  =  0 .. 4,
             FillColor  = RGB::Black.[0.4],
             FillColor2 = RGB::SkyBlue.[0.4],
             LineColor  = RGB::Black.[0.15],
             VLinesVisible = FALSE,
             UMesh = 25,VMesh = 2, Submesh = [2,1]):
XYplane := plot::Surface([x,y,0],
             x  = -4 .. 4,
             y  = -4 .. 4,
             FillColor  = RGB::Green.[0.2],
             FillColor2 = RGB::Green.[0.2],
             UMesh = 25,VMesh = 25):
plot(Cone1,XYplane,Cone2,WorldSurf1,                // sometimes order 
     WorldSurf2,WorldSurf3,LSphere,VSphere,VCSphere,// in this list is important                  
     PrToConeSurf,QAx,QAy,QAt,                      // for transparent objects
             Scaling  = Constrained,
             Axes = None,
             Width = 120, Height  = 150):

[edit] Re: NASA Images

These images should be tagged with {{PD-USGov-NASA}}. Photographs and other NASA images should include the NASA image number if you have it, for easy reference. --Hetar 22:19, 16 September 2006 (UTC)

Thank you. --TxAlien 00:35, 17 September 2006 (UTC)

You should also take credit for any modifications you did. HighInBC 19:20, 20 September 2006 (UTC)

[edit] Tachyon animation = awesome

So are the others, of course, but I'd seen them before. This is easily the best visual description I've seen of this effect. --Grey Knight ⊖ 20:55, 17 November 2006 (UTC)

[edit] Parashute?

Hi. You spelled parachute wrong in this crop of a HiRISE photo [1]. Just bringing it to your attention. It's a very good idea to put those hires beauties on Opportunity's page! --Planetary 03:35, 5 December 2006 (UTC)