Adding Player Controls - Client vs Server
Adding Player Controls - Client vs Server
|Prerequisites||Have completed Arcade Action - Creating a Custom Character lesson.|
|Lesson Time||10 - 15 minutes|
Typically, it’s not considered a good thing when ships just fall from the sky. Since this game uses a custom character, the way that character moves needs to be created. This specific ship will move whenever the player presses a keyboard button and always point at their mouse.
Set Up Controls
To get the ship moving, you’ll use a VectorForce object to act as the engine of your ship. VectorForce objects push whatever they are attached to in a straight line. If you attach one to the HumanoidRootPart, it can be scripted to push the ship towards the player’s mouse.
Adding VectorForce and Attachment
- Under the HumanoidRootPart, add a VectorForce object and an Attachment.
- Set the VectorForce’s Attachment0 to the attachment created last step.
If you test right now, the ship won’t move because the controls need to be added through scripting.
Create the PlayerShipHandler
By default, players can only control the normal Humanoid avatar. Everything else is controlled by Roblox’s servers. Who controls an object, whether it’s the server or the player’s computer is referred to as network ownership. Players won’t be able to pilot the ship themselves until the server is told to give network ownership to the player, which the script below will do for you.
- Inside of ServerScriptService, add a Script.
- Rename the script PlayerShipHandler.
- Copy and paste the code below into the script.
Why Use IsDescendantOf()?
Roblox’s networking API can’t change the owner of a part unless it is in the workspace. Performing the
while not loop will stop the server from setting the network owner until the player is fully loaded into the game.
Creating Player Controls
Before we start coding the controls, now is a good time to start talking about client vs server. There are two places a script can run from. One place is the Roblox server and the other is the client, a player’s computer or device.
Script objects run on Roblox servers which helps make them more secure. Important game play features that you don’t want hacked, like awarding points, should happen on the server. The downside is that there can be lag while waiting for the server, and too many scripts running on the server will make the lag worse.
Things that need to run lag-free, like player controls, should run on the player’s computer using a LocalScript. In general, if the code is something that only the player should see, code it in a LocalScript. If all players should see it, write the code in a Script.
Set Up the ControlScript
This LocalScript will allow players to control the ship by holding down a button and aiming the ship with their mouse.
- In StarterPlayer > StarterPlayerScripts add a LocalScript named ControlScript.
- In ControlScript, add the following variables:
- At the bottom of the script, add the variables for ship speed and controls.
Using Different Controls
To change player controls, change the
FORWARD_KEY variable. Type
Enum.Keycode. to see a set of possible keys.
Make Players Move and Aim
The forward key act likes a gas pedal. While the player is pressing it, the ship’s vector force will go faster and faster. Releasing the key will stop the acceleration, but not the ship’s forward motion, just like a car.
- The function below handles the ship movement. On the next line in ControlScript, copy and paste:
- To make the player’s ship point towards the mouse, copy and paste:
- Type the code below to connect the functions to ContextActionService:
- Test your code, press W to move the ship towards your mouse. The ship is alive!
Ship Moving Too Slow or Too Fast
Your ship may move differently depending on the material you picked. If the material of your ship is something other than “Granite”, you will want to experiment with the value of
PLAYER_SPEED. Granite parts are very heavy compared to other materials.
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