GLTFLoader: Override GLTFCubicSplineInterpolant.protoype.copySampleValue_.

examples/js/loaders/GLTFLoader.js

@@ -913,6 +913,30 @@ THREE.GLTFLoader = ( function () {
 	GLTFCubicSplineInterpolant.prototype = Object.create( THREE.Interpolant.prototype );
 	GLTFCubicSplineInterpolant.prototype.constructor = GLTFCubicSplineInterpolant;
 
+	GLTFCubicSplineInterpolant.prototype.copySampleValue_ = function ( index ) {
+
+		// Copies a sample value to the result buffer. See description of glTF
+		// CUBICSPLINE values layout in interpolate_() function below.
+
+		var result = this.resultBuffer,
+			values = this.sampleValues,
+			valueSize = this.valueSize,
+			offset = index * valueSize * 3 + valueSize;
+
+		for ( var i = 0; i !== valueSize; i ++ ) {
+
+			result[ i ] = values[ offset + i ];
+
+		}
+
+		return result;
+
+	};
+
+	GLTFCubicSplineInterpolant.prototype.beforeStart_ = GLTFCubicSplineInterpolant.prototype.copySampleValue_;
+
+	GLTFCubicSplineInterpolant.prototype.afterEnd_ = GLTFCubicSplineInterpolant.prototype.copySampleValue_;
+
 	GLTFCubicSplineInterpolant.prototype.interpolate_ = function ( i1, t0, t, t1 ) {
 
 		var result = this.resultBuffer;