As a Roblox developer, it is currently too hard to create massive models or scaled models that use particles like Smoke and Fire with creating custom ones. There is currently constraints on Fire.Heat, Fire.Size, Smoke.Size, and a maximum constraint only for Smoke.RiseVelocity. As of right now, ParticleEmitters can have a size of 1000 and as small as zero, so I can’t see why it can’t be changed.
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In the past I’ve heard that rendering large particles was really expensive. Not sure if it’s still true.
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I have witnessed it ingame with CloneTrooper1019’s Super Nostalgia Zone. Rendering large amounts of transparent images, custom or not, uses a lot of resources.
To be more specific particles become very expensive when they’re very big on-screen.
If in both cases 1 individual particle is 8x8 inches on-screen, 5,000 size 0.1 particles will be just as expensive as 5,000 size 200 particles.