Could any of you please help me understand how Quenty's (and a couple more lucky devs') spark system works?

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#1

i HOPE im using the right category this time

it looks ABSOLUTELY amazing. very performant, seems to interact with the environment and it has this absolute swagging motion blur type of thing that i REALLY like

anyways, could any of you please let me know how this type of stuff was achieved❓ looks exactly like something you’d see in frostbite engine games (ESPECIALLY with the motion blur)

example video:

#2

i dont have an exact answer, but i did want to comment.

this is almost 100% a custom particle system - if you have a look, the particles also bounce off the ground. this is impossible with roblox’s current particle system (would be really cool if it was, though). i imagine each particle is being stretched and rotated relative to where it was in the last frame, something like this in pseudocode:

local PreviousParticleScrPos = {...} -- contains the last screen space position of each particle
for ParticleIdx, Particle in Particles do
    local Delta = (Particle.ScreenPosition - PreviousParticleScrPos[ParticleIdx]
    local Orientation = math.atan2(Delta.Y, Delta.X)
    local Length = Delta.Magnitude / 2 -- i think it'd be divided by 2 based on the video - could be wrong
    
    -- cframe calculation is almost certainly wrong :3
    Particle.CFrame *= CFrame.fromAxisAngle(Camera.CFrame.LookVector, Orientation)
    Particle.Size = Vector2.new(Length, Particle.Size.X)
end

again this is just pseudocode and i don’t really know. just a guess from what i saw. this would straight up be terrible for performance, too. so take this with not just a pinch but like a fistful of salt.

also, this really reminds me of the tracer effect from phantom forces, so maybe see if you could find anything on that - could be useful (though i believe phantom forces uses beams for that effect)

#3

thanks, i’ve read the code, redid it by like a lot, and now i got the motion blur working(it uses beams). all thats left is to make a custom particle system lol

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