From aa22216dc81e28e011dda905a676f4539ffbf8c8 Mon Sep 17 00:00:00 2001
From: Michael Herzog <michael.herzog@human-interactive.org>
Date: Sat, 2 May 2026 23:20:28 +0200
Subject: [PATCH] BezierInterpolant: Refactor `inTangents`/`outTangents`.
 (#33515)

---
 src/animation/AnimationAction.js           |  9 ---------
 src/animation/KeyframeTrack.js             |  4 ++--
 src/math/interpolants/BezierInterpolant.js | 10 ++++------
 3 files changed, 6 insertions(+), 17 deletions(-)

diff --git a/src/animation/AnimationAction.js b/src/animation/AnimationAction.js
index 5630db5f5d9a67..c1a26f17dcb628 100644
--- a/src/animation/AnimationAction.js
+++ b/src/animation/AnimationAction.js
@@ -41,15 +41,6 @@ class AnimationAction {
 
 			const interpolant = tracks[ i ].createInterpolant( null );
 			interpolants[ i ] = interpolant;
-
-			// preserve interpolant settings (like tangent data from BezierInterpolant)
-
-			if ( interpolant.settings ) {
-
-				Object.assign( interpolantSettings, interpolant.settings );
-
-			}
-
 			interpolant.settings = interpolantSettings;
 
 		}
diff --git a/src/animation/KeyframeTrack.js b/src/animation/KeyframeTrack.js
index c089adf82ccd78..1fe249ae847ca4 100644
--- a/src/animation/KeyframeTrack.js
+++ b/src/animation/KeyframeTrack.js
@@ -158,10 +158,10 @@ class KeyframeTrack {
 
 		const interpolant = new BezierInterpolant( this.times, this.values, this.getValueSize(), result );
 
-		// Pass tangent data from track settings to interpolant
 		if ( this.settings ) {
 
-			interpolant.settings = this.settings;
+			interpolant.inTangents = this.settings.inTangents;
+			interpolant.outTangents = this.settings.outTangents;
 
 		}
 
diff --git a/src/math/interpolants/BezierInterpolant.js b/src/math/interpolants/BezierInterpolant.js
index 5f433e7af90c2f..f22117af9ce0c5 100644
--- a/src/math/interpolants/BezierInterpolant.js
+++ b/src/math/interpolants/BezierInterpolant.js
@@ -7,9 +7,8 @@ import { Interpolant } from '../Interpolant.js';
  * each keyframe has explicit in/out tangent control points specified as
  * 2D coordinates (time, value).
  *
- * The tangent data must be provided via the `settings` object:
- * - `settings.inTangents`: Float32Array with [time, value] pairs per keyframe per component
- * - `settings.outTangents`: Float32Array with [time, value] pairs per keyframe per component
+ * Tangent data is read from `inTangents` and `outTangents` on the interpolant
+ * (populated by `KeyframeTrack.InterpolantFactoryMethodBezier`).
  *
  * For a track with N keyframes and stride S:
  * - Each tangent array has N * S * 2 values
@@ -29,9 +28,8 @@ class BezierInterpolant extends Interpolant {
 		const offset1 = i1 * stride;
 		const offset0 = offset1 - stride;
 
-		const settings = this.settings || this.DefaultSettings_;
-		const inTangents = settings.inTangents;
-		const outTangents = settings.outTangents;
+		const inTangents = this.inTangents;
+		const outTangents = this.outTangents;
 
 		// If no tangent data, fall back to linear interpolation
 		if ( ! inTangents || ! outTangents ) {