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1.16.5 The game crashed whilst feature placement Error: java.lang.IllegalArgumentException: bound must be positive
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By Duck_leader · Posted
didn't work so i gave up but gonna give your modpack a try -
Hi everyone, I’m working on a custom rocket entity in Forge 1.20.1. During flight, I’m trying to spawn flame and smoke particles that trail behind the rocket, like in Ad Astra or Galacticraft. I’m using ServerLevel.sendParticles() with calculated Y-offsets far below the rocket's base (e.g., getY() - 2.5), so the particles should clearly appear under the rocket thruster. ❗The Problem: Even though I spawn the particles several blocks below the rocket, they still start rising and eventually collide with the rocket from below. It's like the particles are moving upward with the rocket, even though their Y position is set in absolute world coordinates (not relative to the rocket). This causes the trail to look broken, unrealistic, and eventually the flames just slam into the rocket's base, defeating the effect. 🔍 What I’ve Tried: Double-checked that I’m using server.sendParticles(...) with proper world coordinates. Increased vertical offset (up to -3 blocks or more). Spawned debug markers (armor stands) and verified their position is correctly placed far below. Tried spawning trail particles after calling move(MoverType.SELF, ...). Confirmed this only happens when the rocket is moving upwards — at rest, particles stay where they’re supposed to. 🔥 Code Snippet: double rocketBottomY = this.getY() - 2.5; double trailSpacing = 0.12; for (int i = 0; i < 40; i++) { double offsetX = (random.nextDouble() - 0.5) * 0.2; double offsetZ = (random.nextDouble() - 0.5) * 0.2; double flameY = rocketBottomY - (i * trailSpacing); server.sendParticles(ParticleTypes.FLAME, this.getX() + offsetX, flameY, this.getZ() + offsetZ, 3, 0.0, 0.0, 0.0, 0.01); } No matter how far I place the flameY below, it still starts drifting upward with the rocket. I’m not applying velocity to the particles (0.0 on Y), so I have no idea what’s making them rise and then crash into the rock ❓Question Has anyone dealt with this before? How do mods like Galacticraft or Ad Astra keep their flame trails pinned to the world while the rocket moves up? Is this a side-effect of how Forge or Minecraft queues particle updates for moving entities? -
By TileEntity · Posted
But can you load this schematic with worldedit? Or is it a nbt file? -
By Aleksanderyayyyeh · Posted
and thee schematic is called steampunk 1_16 i play on 1.16.5 -
By Aleksanderyayyyeh · Posted
wym prettypipeps mod? never heard of it
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