copy method
Implementation
@override
Camera copy(Object3D source, [bool? recursive]) {
super.copy(source, recursive);
Camera source1 = source as Camera;
matrixWorldInverse.copy(source1.matrixWorldInverse);
projectionMatrix.copy(source1.projectionMatrix);
projectionMatrixInverse.copy(source1.projectionMatrixInverse);
return this;
}