Unity Light Color and Rotation Lerp with AnimationCurve

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