JavaScript Three.js MultiplyVector3 Deprecated How to replace

I have a code, in three.js in console it says :

DEPRECATED: Matrix4's .multiplyVector3() has been removed. Use vector.applyMatrix4( matrix ) or vector.applyProjection( matrix ) instead.

But I have no idea how to do such.

Here is my code:

 var rotation_matrixc = new THREE.Matrix4();
 rotation_matrixc.extractRotation(CHROMEboyPC.matrix);
 var cam_vectorc = new THREE.Vector3(    100 ,  30 ,  5);
 var   final_cam_vectorc = rotation_matrixc.multiplyVector3(cam_vectorc);
 camera.position.copy(CHROMEboy.position ).add(final_cam_vectorc   );
 camera.lookAt(CHROMEboy.position);

How to write equivalent code using suggested Methods.

Answer:1

You use the opposite notation:

Use the vectors .applyMatrix3 or .applyMatrix4 function to rotate the vector

var final_cam_vectorc = cam_vectorc.applyMatrix4( rotation_matrixc );
Answer:2

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