Toy Sat Help
Toy Sat is a naive physics model of a fully actuated 2D cube satellite (no flywheels). All motion is calculated based on physical properties:
- F = ma
- M = Fd
- etc...
The thrusters output a constant force each video frame. Every frame a thruster is active, the fuel level is reduced, reducing the mass of the satellite - the satellite accelerates way faster when it is low on fuel! You can see the fuel / mass level on the RHS of the screen
You can control the individual thrusters by clicking or pressing on the buttons, or use the keyboard. The grey buttons combine typical thruster combinations for understandable motion. You can use the keyboard arrow keys for direction and 'a' and 'z' to set rotation using these same thruster combinations.
A hidden keyboard only thing: hit the spacebar to draw the path the satellite has taken.
The round red button 'q' triggers a control function that calculates thruster sequences and durations required to bring the satellite to a stop before navigating it back to the middle of the screen. The control sequence is:
- stop any spin
- stop the trajectory
- rotate the satellite to orient with the screen (start and stop burns)
- [Working on]: fly the satellite back to the center of the screen (start and stop burns)
- [Working on]: enter HOLD POSITION mode until a new manual input is made
You will notice some inefficiencies in this approach - if the satelite is already spinning, why stop it spinning at an arbitraty angle only to start it again to reach the desired angle? Momentum is a useful tool, I don't use it to full potential here.
The physics will also fall apart at high velocity, acceleration, or rotation values. This is running in a webbrowser after all. You can break it nicely by getting the satellite up to speed and in a spin, then hitting the red button.
Eventually the satellite will run out of fuel and will be uncontrollable, 'on the float'.


If you are going to use any GCP resources for local development or plan to deploy Tide to the cloud, then you will have to install some prerequisites and get everything properly setup first.
service-account.json
gsutil
Go to the Credentials section of your project in the Console. Click Create credentials and then click Service account key. For the Service account, select App Engine app default service account. Then click Create to generate and download the JSON service account key file to your local machine. Save the file as service-account.json
in the the projects root directory. We will use this file to connect to Google Cloud Platform services and API's like Cloud Storage and Cloud SQL.
If App Engine app default service account is missing from the list of service accounts, then you haven't activated App Engine for your project or it is still initializing.
Deploying to GCP is optional and not required for local development. In this section we've included some of the basic steps required to get setup on GCP.
You are required to create an .env.gcp
file in the project root. You should also add the correct values to the variables in the .env
file only if you plan to deploy or test real GCP resources. However, the .env.gcp
file makes deploying services to GCP a lot easier, since the .env.gcp
file will override values in the .env
file to update any YAML deployment files, but not environment variables.
These three variables are required for both local development and deployments to GCP.
| Variable | Description |
|---|---|
GCP_PROJECT |
The unique ID of you Google project. Default is tide-local . Note: you must update this value if you plan to use any GCP resources, for purely local development the default value will work as-is. |
GCP_REGION |
The region where all your resources will be created. For example, us-west1 . |
GCP_ZONE |
The preferred zone in your region that resources will be created, For example, us-west1-a . |
Remember to add the region you end up using during the gcloud app create
step on the Google App Engine page or you'll be troubleshooting the reason things are not working for hours.


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