Setting up your Script

Now that we've created our template file, we can begin to start writing our script.

Although we created the system, we actually don't know where Mars will be by the time the rocket gets there. To figure out what we need, we'll use the axana.intercept function to find the point that we'll land at.

import axinite as ax # Importing axinite as ax
import axinite.tools as axtools # Importing axtools for loading
import axinite.analusis as axana # Importing analyzation functions as axana

args = axtools.read("examples/rocket-launch.tmpl.ax")
bodies = axtools.load(args, verbose=True) # Loading the system

result = axana.intercept(bodies[3], bodies[2], (0, 1.1e4), ax.timesteps(args.limit, args.delta), args.delta, verbose=True)
# Gets the intercept point for the Rocket and Mars

position = result[1]
unit_vector = result[3]
speed = result[0]

Now unit_vector holds the direction towards the point we're aiming for, and speed holds our average travel speed.

If you get a NoneType error, that means your rocket couldn't find an intercept. You can try adjusting the speed range ((0, 1.1e4)) or editing your template.

With those variables, we can now write our modifier:

This is a highly simplified version of a rocket launch that does not account for any forces other than thrust and gravity.