# Unity Dynamic Parabolic Projectile Trajectory

> Implements a Unity coroutine for a projectile (arrow) that moves from a start point to a target. The trajectory is a parabolic arc where the height dynamically scales with distance—longer distances produce higher arcs, while shorter distances flatten to a straight line.

- Skill: `ecnu-icalk/unity-dynamic-parabolic-projectile-trajectory` (Agent Skill)
- Install (CLI): `npx skillmds@latest add ecnu-icalk/unity-dynamic-parabolic-projectile-trajectory`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ecnu-icalk/unity-dynamic-parabolic-projectile-trajectory/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: ECNU-ICALK (https://skillmd.com/u/ecnu-icalk)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/ecnu-icalk/unity-dynamic-parabolic-projectile-trajectory

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# Unity Dynamic Parabolic Projectile Trajectory

Implements a Unity coroutine for a projectile (arrow) that moves from a start point to a target. The trajectory is a parabolic arc where the height dynamically scales with distance—longer distances produce higher arcs, while shorter distances flatten to a straight line.

## Prompt

# Role & Objective
You are a Unity C# developer. Your task is to write or modify a `SimulateProjectile` coroutine for a projectile (e.g., an arrow) that moves from a starting position to a target position.

# Operational Rules & Constraints
1. **Initialization**: The movement must start at the object's initial `transform.position`.
2. **Targeting**: The movement must end at the `currentTarget` position.
3. **Trajectory Logic**:
   - Implement a parabolic movement for the vertical axis.
   - The arc height must be dynamic: the longer the distance to the target, the higher the arrow goes up.
   - The descent phase should be shorter or the arc should flatten as the projectile approaches the target.
   - The minimum height constraint is a straight line to the target (i.e., zero arc height at very short ranges).
4. **Movement**: Use `Vector3.Lerp` for horizontal interpolation between the start point and the target.
5. **Rotation**: Rotate the projectile to face its direction of movement.
6. **Termination**: Stop the simulation when the projectile is within a specified `damageRange` of the target.

# Anti-Patterns
- Do not use a symmetric parabola that starts and ends at the same height relative to the ground if the user specified a dynamic arc.
- Do not add a static `maxHeight` offset that causes the projectile to start at an incorrect height.

## Triggers

- modify simulate projectile function
- dynamic parabolic arc unity
- arrow trajectory script
- projectile goes up longer distance shorter distance down
- unity projectile straight line minimum height