Posts by Epimetheus

by Epimetheus
06.04.2008, 12:04
Forum: Development
Topic: Watch out for ijgjpeg.lib and missing textures!
Replies: 16
Views: 5254

Re: Watch out for ijgjpeg.lib and missing textures!

A sidenote: My MS Program Maintenance Utility v8.0 informed that the /GX compiler option will be removed in a future release. Use /EHsc (exception handling) instead of /GX . The /YX and /ML options were not recognized and were ignored in the provided makefiles. Just an FYI. NMAKE version 8.00.50727....
by Epimetheus
06.04.2008, 11:51
Forum: Development
Topic: Watch out for ijgjpeg.lib and missing textures!
Replies: 16
Views: 5254

Watch out for ijgjpeg.lib and missing textures!

I discovered that the celestia.mak file is currently linking to the ijgjpeg.lib library in the LINK32_FLAGS setting. You'll need to change the link from ijgjpeg.lib to libjpeg.lib at line ~146, and the link at line line ~336 to libjpegd.lib (debug) before you compile from the commandline. I had a lo...
by Epimetheus
05.04.2008, 09:35
Forum: Development
Topic: A primer for new C++ developer volunteers on Win XP
Replies: 106
Views: 117323

Re: A primer for new C++ developer volunteers on Win XP

t00fri wrote:congrats!

F.

Bitte doch mal! :mrgreen:
by Epimetheus
05.04.2008, 02:48
Forum: Development
Topic: A primer for new C++ developer volunteers on Win XP
Replies: 106
Views: 117323

Re: Re:

In my Celestia.vcproj (located in the src/celestia directory), I got these relevant lines, for example: AdditionalOptions="/D "CELX=enable" /D " SPICE=enable" /D "LUA_VER=0x050100"" AdditionalIncludeDirectories="..;..\..\inc\libjp...
by Epimetheus
04.04.2008, 16:59
Forum: Development
Topic: Trajectory of Sun's motion
Replies: 27
Views: 11177

Re: Trajectory of Sun's motion

Well, this forum is not well suited for math notation, so we should really activate the LaTex feature ASAP! X.X is to indicate the scalar product of the two vectors. To be precise, if X is a row vector, like so, X=(c*t, x,y,z) then the other X should be a transposed, i.e. /column/ vector. But colum...
by Epimetheus
04.04.2008, 15:52
Forum: Development
Topic: Trajectory of Sun's motion
Replies: 27
Views: 11177

Re: Trajectory of Sun's motion

Just follow the good doctor's links in a prior post here:

viewtopic.php?f=4&t=11959

:)
by Epimetheus
04.04.2008, 15:12
Forum: Development
Topic: Trajectory of Sun's motion
Replies: 27
Views: 11177

Re: Trajectory of Sun's motion

Note the most fundamental feature that is at the basis of all this: the speed of light c stays the same in all possible frames (it gets NO prime)!! Despite all components of the 4-vector change, the length of that 4-vector must remain the same, hence we get the equation that I wrote down above: X.X...
by Epimetheus
04.04.2008, 14:03
Forum: Development
Topic: Trajectory of Sun's motion
Replies: 27
Views: 11177

Re: Trajectory of Sun's motion

Epimetheus, Consider the components of the vector X in 2 such frames, this means X.X=X^2 = (c*t)^2 - x^2 -y^2 -z^2 = (c*t')^2 - x'^2 -y'^2 - z'^2 Forgive my budding mathematical knowledge ( intermediate algebra and intro to discrete math), Dr. Shrempp, but in the above equation are we using ' as lo...
by Epimetheus
04.04.2008, 04:25
Forum: Development
Topic: Triaxial ellipsoids added in solar system
Replies: 7
Views: 3173

Re: Triaxial ellipsoids added in solar system

Whoa! That's one strange looking KBO! Like a big spinning ice cube with the cross section of an M&M! 8O

Great job!
by Epimetheus
04.04.2008, 04:18
Forum: Development
Topic: Trajectory of Sun's motion
Replies: 27
Views: 11177

Re: Trajectory of Sun's motion

More interesting examples of tesseracts (4-dimensional hypercubes). Great animation http://chaos-syndrome.deviantart.com/art/Tesseract-13963126 Flash animation of a tesseract. Allows manual spinning of the cube on its planar axis. The z-w plane axis is particularly interesting. http://dovsherman.dev...
by Epimetheus
03.04.2008, 23:06
Forum: Development
Topic: Trajectory of Sun's motion
Replies: 27
Views: 11177

Re: Trajectory of Sun's motion

Are you referring to the way, say, Mercury appears to go backwards in its orbit as it races past the earth and begins to turn on its leg around the sun due to our frame of reference? That would be a very cool phenomenon to model! Some interesting math involved, eh? The apparent retrograde motion of...
by Epimetheus
03.04.2008, 09:30
Forum: Development
Topic: A primer for new C++ developer volunteers on Win XP
Replies: 106
Views: 117323

Re: A primer for new C++ developer volunteers on Win XP

Thanks, Fridger, great information! Much appreciated.
by Epimetheus
03.04.2008, 05:27
Forum: Development
Topic: Trajectory of Sun's motion
Replies: 27
Views: 11177

Re:

I want to introduce an orbit plotting feature that will let the user select a time range and reference frame for plotting any orbit. Good! ;-) . Orbits are frame dependent. As we all know e.g. in the rest frame of Earth , the other planetary orbits also look quite "odd" and apparently non...
by Epimetheus
03.04.2008, 05:04
Forum: Development
Topic: Visual Studio 2008EEd can compile celestia with minor tweaks
Replies: 13
Views: 5843

Re:

Ajaja wrote:Celestia is compatible with VS2008!!! Just need small fix. In render.cpp and stardb.cpp - functions "operator<(...)" must be in namespace std:

I'm curious to know how you've set up your celvars.bat file. What version of the Platform SDK and NMAKE are you using?
by Epimetheus
03.04.2008, 04:33
Forum: Development
Topic: Open Source
Replies: 30
Views: 11128

Re:

Guys, the problem of management depend on individuals. If you are lucky enough to have plenty of highly efficient people like Fridger and Chris, no need of management, those persons are enough skilled to achieve a "mind fusion". Now if you talk about a compartmentalized structure where pe...
by Epimetheus
03.04.2008, 04:27
Forum: Development
Topic: A primer for new C++ developer volunteers on Win XP
Replies: 106
Views: 117323

Re:

While I have no idea what this fancy CVS software is good for, I do it quite differently on my Windows XP laptop : Since I have installed a layer of CYGWIN Linux on top of XP, a little (but clever) script does ALL of the following actions, when I type its name ('cel') into a CYGWIN zsh terminal: By...
by Epimetheus
02.04.2008, 23:42
Forum: Development
Topic: Open Source
Replies: 30
Views: 11128

Re: Open Source

I would like more collaborators; I think it has nothing to do with any lack of openness in Celestia, and is mostly a matter of finding people with the both the time and the appropriate astronomical knowledge and/or programming skill. --Chris First off, Chris, let me just say a big thank you for the...
by Epimetheus
02.04.2008, 10:12
Forum: Development
Topic: Trouble with first compile
Replies: 8
Views: 3227

Re: Trouble with first compile

cartrite wrote:Did you do a svn update? It is now at r4234. It looks like you are using an older vcproj file that needs 3 new planetgrid files.
cartrite

Thanks cartrite, I'll check into that!
by Epimetheus
02.04.2008, 10:10
Forum: Development
Topic: Trouble with first compile
Replies: 8
Views: 3227

Re: Trouble with first compile

Your points are all well-taken. I just started programming with C++ and Qt about a year ago. I haven't even touched any of the codebase yet. I'm just trying to get a successful build! Celestia is an awesome program and my hat is off to all the contributors and developers. Good point on grep for wind...
by Epimetheus
02.04.2008, 07:13
Forum: Development
Topic: Trouble with first compile
Replies: 8
Views: 3227

Re: Trouble with first compile

Have you tried using the Visual Studio project file to build Celestia? --Chris Hey Chris, Yes I have, and I had similar problems. I know I'm not including some lib or dll because I keep getting unresolved external link errors. I'm farther than I was. BTW, what is the proper location for Dlls? I've ...

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