Game Development
Primitive objects
Learn primitive objects like Cube, Sphere and Capsule.
What Are Primitive Objects?
To rapidly build prototypes or test environments, Unity provides ready-made basic 3D geometries (primitive objects). These include Cube, Sphere, Capsule, Cylinder, and Plane shapes. They can be created dynamically from code using the GameObject.CreatePrimitive method.
GameObject cube = GameObject.CreatePrimitive(PrimitiveType.Cube);
Components of Primitive Objects
When a primitive object is created, Unity automatically adds four essential components: Transform for positioning, MeshFilter for geometry, MeshRenderer for drawing, and a Collider (such as BoxCollider) for collisions. Thus the object is immediately visible and ready to interact with the physics engine.
GameObject sphere = GameObject.CreatePrimitive(PrimitiveType.Sphere);
Debug.Log(sphere.name); // "Sphere"
Exercise Create Cube Primitive
Create a cube using GameObject.CreatePrimitive(PrimitiveType.Cube). Print the object's name using Debug.Log(kup.name);.
Show example solution
using System;
public enum PrimitiveType { Cube, Sphere, Capsule, Plane }
public class GameObject
{
public string name;
public GameObject(string name) { this.name = name; }
public static GameObject CreatePrimitive(PrimitiveType type) => new GameObject(type.ToString());
}
public static class Debug
{
public static void Log(object message) => Console.WriteLine(message);
}
public class Program
{
public static void Main()
{
GameObject kup = GameObject.CreatePrimitive(PrimitiveType.Cube);
Debug.Log(kup.name);
}
}
Test yourself
-
Which CreatePrimitive call is made to create a Sphere in the scene from code?
- GameObject.CreatePrimitive(PrimitiveType.Sphere)
- GameObject.CreatePrimitive(PrimitiveType.Cube)
- GameObject.CreatePrimitive(PrimitiveType.Capsule)
- GameObject.CreatePrimitive(PrimitiveType.Plane)
Show answer
GameObject.CreatePrimitive(PrimitiveType.Sphere) — To create a sphere geometry, the PrimitiveType.Sphere parameter is supplied.
-
Create Capsule Object
GameObject kapsul = GameObject.CreatePrimitive(PrimitiveType.____);
Show answer
GameObject kapsul = GameObject.CreatePrimitive(PrimitiveType.Capsule);
-
Primitive Types
- PrimitiveType.Cube
- Cube geometry
- PrimitiveType.Sphere
- Sphere geometry
- PrimitiveType.Capsule
- Capsule geometry
- PrimitiveType.Plane
- Flat ground geometry
Next lesson: Importing a model
