public void interpolateTransforms(Transform t1, Transform t2, float delta) {
        this.rot.set(t1.rot);
        this.rot.nlerp(t2.rot, delta);
        this.translation.interpolateLocal(t1.translation, t2.translation, delta);
        this.scale.interpolateLocal(t1.scale, t2.scale, delta);
    }
Interpolates quickly between the specified transforms, using
{@link Quaternion#nlerp(com.jme3.math.Quaternion, float)} and
{@link Vector3f#interpolateLocal(com.jme3.math.Vector3f, com.jme3.math.Vector3f, float)}.

@param t1 the desired value when <code>delta</code>=0 (not null,
    unaffected unless it's <code>this</code>)
@param t2 the desired value when <code>delta</code>=1 (not null,
    unaffected unless it's <code>this</code>)
@param delta the fractional change amount
jme3-core/src/main/java/com/jme3/math/Transform.java