Starting a beam from part's position when moving

[delicate trellis]

I have a gun model attached to the player's model and I have an attachment in the gun that's supposed to be the bullet's start position. I'm getting the attachment's WorldPosition and creating a beam starting from that position.

Everything works well until I start moving. If I move to the left and shoot at the same time, the beam starts from too much to the right. If I move forward and shoot at the same time, the beam starts from too much to the back.

It doesn't seem to be an issue with the beam staying visible so long that my character has time to move while it's there. It's literally starting from the wrong position.

[crisp sandal]

have you ever heard of raycasting

@delicate trellis

[lone arch]

client-server replication problem
you can either execute the beam on a local script or do some velocity prediction

local gun = --position of your gun
local position = --the initial position of you beam
local velocity = gun.PrimaryPart.AssemblyLinearVelocity
local t = --how long in the future do you want to predict,like 0.5 secs or so
local predictedPosition = position + velocity * t

[lone arch]

or use raycast like he said
and have the beam as sfx only on client side
that will work well

[delicate trellis]

this is just for the visuals

[delicate trellis]

its executed on the client already

seems very weird that the starting position is off since its on the client fully

[lone arch]

huh thats weird

can i take a look at the code?