Aiming and Shooting With Crosshair- Game Dev Series 123

Objective: create a shooting function with crosshair.

Crosshair is a standard element of 1st person and 3rd person shooter game, which is what we are going to create in this article.

Create the crosshair

The concept of crosshair is simple, an image of crosshair covered the top layer of game, which is the UI.
Create an image object of UI, and drag in the crosshair image to it.

Then set the anchor to the center of screen, and scale it to a proper size. That is our crosshair.

Now we can make it as our shooting crosshair.

Raycast to shoot

To creating the shooting function, we need to create a new script to handle this part.
Create a new script, and create an if statement to detect the mouse left click insides Update().

To shoot from the crosshair, we need to create a ray from the center of screen, and detect raycasthit on objects.
In here, we use ViewportPointToRay to create this ray.

When we using ViewportPointToRay from camera, it would create a ray from camera to through viewport to the nearest object(surface). With the range from camera to viewport, the coordinate would be 0, 0 (bottom-left) to 1, 1(top right). And that is why we use 0.5, 0.5 as the center of screen.

Now we can use raycasthit to detect any hit objects with this ray.
And return its name to make sure what we exactly hit.

All done! Play and test it ,you should see the crosshair is functional now!




A passionate gamer whose goal is to work in video game development.

Love podcasts or audiobooks? Learn on the go with our new app.

Recommended from Medium

How can microtools save your business

MySQL Performance Optimizations

Express & MariaDB With Docker Compose

AWS Certification for Solution Architect

Building your own Maven archetype

Omnichannel Product Using AWS Services

Credit Checker: Automate credit report data from all major credit bureaus inside Salesforce

Greenfield Dreams

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store
S.J. Jason Liu

S.J. Jason Liu

A passionate gamer whose goal is to work in video game development.

More from Medium

Day 105: Working with Animation Events in Unity

Building A Stealth Game — Helping Your Guards “See”

Learn to code by making a 2D space shooter game.

Gamedev Log: “Slash’n’crack” #2 (Unity/C#)