public Vector3f addLocal(float addX, float addY, float addZ) {
        x += addX;
        y += addY;
        z += addZ;
        return this;
    }
Adds specified amounts to the vector's components and returns the
(modified) current instance.

@param addX the amount to add to the X component
@param addY the amount to add to the Y component
@param addZ the amount to add to the Z component
@return the (modified) current instance (for chaining)
jme3-core/src/main/java/com/jme3/math/Vector3f.java