In this article I will show you how to apply the mirror modifier to an object in Blender so we can model one side of that object while Blender automatically creates the other side for us. Let’s take a look.
First of all start a new Blender project and press the tab key on your keyboard to get into the edit mode, make sure you have selected the default cube, if not press the A button to select the entire cube. Next press the W key then select subdivide to divide the cube into more division. Press A again to deselect everything, change to WireFrame mode, switch to Front Ortho view, also make sure you are in the Vertex select mode, next press the B key and drag your mouse to select only the left Vertices of the cube as shown below.
Next press x and delete the selected Vertices.
Now click on the Modifier icon on the property window, then click on Add Modifier and select Mirror.
Under the Mirror Modifier panel do the below setting.
That is it! Now you can edit the right side of the cube and those changes will automatically reflected in the other.
Question most people always ask : How to turn the mirror of the above object into the real object
The answer is really simple, make sure you are in the Object mode then press on the Apply button on the Mirror Modifier panel.
Now you can paint on the cube as you wish.