How to create a GameObject in Unity? -- Unity

In general, you can create a GamObject with a few steps.

Step1:

Empty GameObject

Step2:

Add a Compoenent you nedd.

How to create Empty GameObject:

using new GameObject.

e.g.

MyGO=new GameObject();

How to AddComponent:

using AddCompoenent method of the GameObject.

[syntax]

(1)AddComponent<typename>();

(2)AddComponent(typeof(typename));

(3)AddComponent("<typename>"); //obsolete

where typename is a name of component that your need.

e.g.

MyGO.AddComponent<Mesh>();

[NOTE]

(1)AddComponent("<typename>"); //it is obsolete, I recommend that don't use it.

more details on:

But I don't find the way that creating 3D Object with AddComponent method.

I find the new way.

How to create 3D Object?

using CreatePrimitive.

[syntax]

GameObject.CreatePrimitive(<typename>);

where typename is a name of component that your need.

e.g.

  plane  = GameObject.CreatePrimitive(PrimitiveType.Plane);

source:

UnityGameObject