Particles are perfect for creating a muzzle flash

to feedback to the player that they are firing.

In the SMG scene

Add a GPUParticles3D node

Rename it to MuzzleFlash

In the Draw Passes property

For Pass 1 add a New BoxMesh

Set the size to 0.1m on X, Y and Z

In the Transform property of the MuzzleFlash

Position the particles at the muzzle of the rifle

In the Time property

Set the Lifetime to match

The fire_rate which is 1.0/14

Press enter and this will update with the result

Enable One Shot

So the weapon doesn't fire continuously

To make the particles shrink

and fade out over time

Expand the Display property

Expand the Scale property

In the Scale Curve property

Add a New CurveTexture

Expand the CurveTexture

Drag the curve to match the image shown

Now Particles will shrink and disappear as they move further

Away from the muzzle

Find the emission property

Enable it

Change the emission colour to white

Set the Energy Multiplier to 3.0

To make the particles emit when shooting

In the HitScanWeapon script

Add an export var for the MuzzleFlash (particles)

In the shoot function

restart the muzzle flash

after each shot

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