UE4 makes crosshair + recoil

I. Introduction

We often use the crosshair to aim and shoot in the process of shooting game development. There are many ways to do this function. Today, I will teach you a method that can adjust the size of the crosshair by yourself.Its principle is: use the material to make a crosshair, and then adjust the material parameters to achieve the expansion and scaling of the crosshair.The principle of recoil is to hit the object with a ray from the camera, and then add a position offset to the aiming direction, and the final aiming direction is the original aiming direction plus the shooting offset.

II. Introduction to ideas

Shooting aiming is aimed at the camera, that is, the center of the screen is issued, and the crosshair is drawn in the center of the screen.

The direction of the shooting is mainly achieved by the ray detection of UE4 to achieve the position of the shooting

The offset is mainly an offset on the X-axis, Y-axis, and Z-axis of the hit position

The position displayed on the screen is mainly added to the screen by UMG

Three. Cases

Step 1: Create a material to draw the crosshair

Create a UMG, add a picture, and add the created crosshair material into it

Open the FirstPersonCharacter blueprint to add the UMG to the screen

Step 2: Open the first-person FirstPersonCharacter, and set the displacement offset according to the principle. I created a pure virtual function here.LocationOffset function

The third step, the recoil trajectory changes, use the timeline to make an animation curve

Two parameters of the curve (0,1), (0.5,0);

The fourth step: the left mouse button to fire the design, use LineTranceForObjects ray detection to detect the position of the shooting, and generate particle effects.

Three, the effect is as follows