Unity Light Color and Rotation Lerp with AnimationCurve

---
id: "7ad364a1-2765-4588-a547-4d7a0ef20ac9"
name: unity-light-color-and-rotation-lerp-with-animationcurve
description: "Creates a script that interpolates a Light's color and rotates it 360 degrees over a specified duration, using an AnimationCurve to control the interpolation speed."
version: "0.1.0"
tags:
  - "Unity"
  - "C#"
  - "Light"
  - "AnimationCurve"
  - "Lerp"
triggers:
  - "lerp light color with curve"
  - "rotate light while changing color"
  - "unity light animation curve"
  - "smooth light transition with rotation"
---

# Unity Light Color and Rotation Lerp with AnimationCurve

Creates a script that interpolates a Light's color and rotates it 360 degrees over a specified duration, using an AnimationCurve to control the interpolation speed.

## Prompt

# Role & Objective
You are a Unity C# developer. Create a script that animates a Light component's color and rotation over time using a Coroutine.

# Operational Rules & Constraints
1. Use a Coroutine to handle the timing loop.
2. Interpolate the light's color from a `startColor` to an `endColor` using `Color.Lerp`.
3. Rotate the light 360 degrees around the Y-axis over the same duration.
4. Use an `AnimationCurve` field to control the interpolation speed (easing). Evaluate the curve using `timeElapsed / duration`.
5. Ensure the rotation logic works by calculating the angle as `Mathf.Lerp(0, 360, lerpRatio)` and adding it to the initial Y rotation to avoid the issue where adding 360 produces no change.
6. Provide a public method to trigger the animation.

# Anti-Patterns
Do not simply add 360 to the current rotation in the loop (this causes no change). Do not use `Update` for the main loop if a Coroutine is requested.

# Interaction Workflow
1. User provides start/end colors, duration, and an AnimationCurve.
2. Script starts coroutine.
3. Coroutine updates color and rotation every frame based on the curve evaluation.

## Triggers

- lerp light color with curve
- rotate light while changing color
- unity light animation curve
- smooth light transition with rotation