Accurate Projectile Trajectory Preview

Forked from [Projectile Trajectory Preview](https://github.com/maDU59/ProjectilesTrajectoryPreview) by maDU59 ([MIT License](https://github.com/maDU59/ProjectilesTrajectoryPreview/blob/main/LICENSE))

Ever wondered where your arrow, snowball, or potion will land? This mod provides a visual preview of projectile trajectories, similar to PTP, but with improved prediction accuracy and no multiplayer limitations. ## 🔎 Features - Trajectory Visualization: Displays the expected path of your projectile before launching. - Target Highlighting: Trajectory color indicates a higher likelihood of hitting a target. ## ⚠️ Limitations and Notes - Minecraft projectile physics include random spread offsets, so the actual impact position may slightly differ from the preview. - However, trajectory prediction is designed to be more precise than the original PTP implementation. ## 🔬 Technical Changes Compared to Original PTP - This fork modifies both the simulation logic and multiplayer behavior: ## Multiplayer behavior - Removed the server handshake check (serverHasMod) - Removed networking validation logic - Trajectory preview is now always available client-side (no server requirement) ## Simulation changes 1. Removed projectileInfo.order-based update system The original implementation updated motion using a configurable order array. This fork replaces it with a fixed per-tick update sequence: - position update - drag application - gravity application This makes motion simulation consistent and closer to vanilla projectile behavior. 2. Reworked entity collision handling - Reduced broad-phase AABB inflation from 1.0 to 0.3 - Added distance-based spread-aware entity hit detection - Added a “guaranteed hit” detection flag when the ray intersects the true bounding box 3. Improved spread simulation - Added distance-based spread offset: `spreadOffset = normalizedVelocity * (distanceFromStart * maxSpreadFactor)` - Adjusted spread multiplier from `* 3.0` to `* 2.0` - Spread is now simulated dynamically per step instead of being approximated 4. Refined water physics handling - More explicit switching between normal drag/gravity and underwater values - Applied consistently during simulation loop 5. Minor stability improvements - Early velocity zero-check `(vel.lengthSqr() < 1e-8)` - Added `startPos` tracking for spread calculation ## 📦 Modpacks Feel free to include this mod in your modpacks.

Medigun

Compatibility

Minecraft: Java Edition

Platforms

Supported environments

Tags

Creators

Details