.dll Question Planet Modules

[cristiapi]

The first thing you should do is to write a function which takes in input a time (MJD, for example) and outputs the x, y and z or l, b and r coordinates of the body for that time (both position and velocity).

Only after you coded that stuff, you can try to write your dll for that body.

 

[jedidia]

Erm... maybe we should take a few steps back here... Anroalh12, what exactly do you want to do? why do you want to write a planetary module?

I get the impression that you don't know much about programming in general... And you'll need at least a bit of basic knowledge to start off on when you want to write an Orbiter Module. Maybe there are easier ways to accomplish what you want to do without a module. Or if not, it would be best to start by aquiring a little general programming knowledge before you jump into Orbiter...

 

[Anroalh12]

I want like a celbody module to control a planet.

 

[jedidia]

And what do you want the planet to do exactly?

 

[Anroalh12]

I want to do three dlls for my Interstellar addon to control the orbits of the planets.

 

[jedidia]

Ok, so I assume they are special, non-Kepler orbits. You have previously asked what an Ephemeris is. You'll need to know that, because you'll have to write one. Looking up what it is might be a good start. How good is you math?

 

[Anroalh12]

Good+ (A in USA)

 

[jedidia]

Great, then understanding an Ephemeris shouldn't be too tough. Next question, what expierience do you have with programming?

 

[Anroalh12]

Nothing.

 

[cristiapi]

I want to do three dlls for my Interstellar addon to control the orbits of the planets.

Do you know the position and the velocity of those 3 planets as a function of MJD?

 

[jedidia]

Nothing.

Ok, then that's the point to start. You don't have to become a pro, but at least familiar with the basics of C++ and general concepts like variables, if-then statements and for loops, types, functions and classes. It's best you look around for some beginner C++ tutorials. Once you know what the things mean I wrote above, and how they look in C++, you'll be able to understand what the code means you posted earlier on.

 

[Anroalh12]

Do you know the position and the velocity of those 3 planets as a function of MJD?

No

Enviado desde mi Aquaris E5 HD mediante Tapatalk

 

[cristiapi]

Then how do you think to move the planets?

You need to know something like this:
t= MJD * any_constant
x= 123456 * cos(t)
y= 123456 * sin(t)
z= 123456 * any_function(t)

xv= x', yv= y', zv= z' (the derivative of x, y and z)

The planet will assume those positions wrt its parent body (defined in Sol.cfg).
If you don't know how to calculate those values, you're just wasting your time.