ArcCast — Trajectory & Landing Preview

Unreal Engine 5.8 · one runtime module · Win64

The throw arc you can actually ship: bounce-chained trajectory prediction with a landing verdict, a splash ring conformed to the geometry, and occlusion-aware drawing — on UCanvas, so it survives a Shipping build.

The engine already predicts the path. It just cannot draw it: the only renderer is DrawDebugLine, and ENABLE_DRAW_DEBUG is 0 in Shipping. ArcCast draws through AHUD instead — no material, no mesh, no Niagara, no asset of any kind.

ArcCast does not throw anything. No projectile, no damage, no replication. It shows where the thing your game is about to launch would end up.

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Quick start

1. Copy ArcCast/ into your project's Plugins/ folder, restart the editor.
2. Add the ArcCast component to the actor that aims. Attach it to the hand or the muzzle.
3. Leave Profile empty — the built-in Grenade profile is used, so an arc appears immediately.

The arc is visible in PIE and in a packaged build through whatever HUD class you already have, and in the editor viewport with no play session — for that last one press G for Game View, because the editor path hangs off the engine's Game show flag.

To throw for real, hand Get Launch Location and Get Launch Velocity to your spawn — then the projectile follows the arc that was drawn.

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What it does past the engine's own prediction

• Bounce chain — the simulation continues past the first hit; later stretches draw thinner and fainter.
• Landing verdict — Valid / TooSteep / Blocked / OutOfRange / NoGround, colouring the arc and broadcast as an event. With the navigation check on, it is a teleport target indicator.
• Conformed splash ring — every ring point is probed onto the surface, so the ring lies on stairs and slopes instead of hovering through them.
• Occlusion-aware drawing — hidden stretches are drawn faint and dashed, not removed.
• Prediction with no drawing — Predict Arc returns the whole result and draws nothing.

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Console commands

ArcCast.Test · ArcCast.Bounces <n> · ArcCast.Occlusion 0|1 · ArcCast.Style solid|dashed|dots|clear · ArcCast.Clear · ArcCast.Stats [0|1]

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Documentation

Online, free and without an account: https://github.com/SimulatedFlow/documentation

Full documentation: Docs/DOCUMENTATION.md Store description and honest limits: Docs/Fab-Store-Description.md

Online: https://github.com/SimulatedFlow/ue-plugin-ArcCast Support: mailto:teufelsilvan@gmail.com

Copyright 2026 Silvan Teufel. All Rights Reserved.

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© 2026 Silvan Teufel. All rights reserved.