Now that the script is set up we can remove the Mesh Renderer and Cube (Mesh Filter) components.

I decided to add some space debris to keep things interesting as well as boost score, to do this add new game object and rename it to Asteroid and set the transform Z-axis to 8. Taking an asteroid model from the models folder drag it to the Asteroid parent object in the hierarchy making the asteroid model a child. Select the Asteroid parent and add component physics, rigidbody and deselect use gravity then add another component physics, capsule collider then alter the collider to match the rough size of the asteroid. With the asteroid game object selected add component, new script and rename it to RandomRotator. Open this script and edit it

Public class RandomRotator : MonoBehaviour
{
Public float tumble;
Void start ()
{
GetComponent<rigidbody>().angualrVelocity = Random.insideUnitSphere * tumble;
}
}
Select the Asteroid parent and set the tumble value to 5 and change the angular drag to 0 so that it doesn’t slow down, add component new script and name it DestroyByContact and open it
Public class DestroyByContact : MonoBehaviour
{
Void onTriggerEnter(Collider other) {
If (other.tag == ”Boundary”)
{
Return;
}
Destroy(other.gameObject);
Destory(gameObject);
}
}

Now select Boundary and where it says Untagged click it and change it to Add tag which will bring up tags and layers in the inspector, in element 0 type in Boundary, and now back in the Boundary inspector click again on the Tag and change it from Untagged to Boundary.

Now to make the game more appealing visually I decided to add some explosions, I started by opening up the DestroyByContact code
Public class DestroyByContact : MonoBehaviour
{
Public GameObject explosion;
Public GameObject playerExplosion;

Void onTriggerEnter(Collider other) {
If (other.tag == ”Boundary”)
{
Return;
}
Instantiate(explosion, transform.position, transform.rotation);
If (other.tag == “Player”){
Instantiate(playerExplosion, other.transform.position, other.transform.rotation);
}
Destroy(other.gameObject);
Destory(gameObject);
}
}
Now in unity in the prefab VFX folder I took explosion asteroid and dragged it to the explosion slot to create a reference to it on our destroy by contact script. Now selecting the player in the hierarchy change the tag from Untagged to Player after that select the Asteroid parent and drag an explosion effect to the player explosion slot in the inspector.
Now drag the Mover script onto the asteroid parent inspector and set its speed to -5 so that the asteroid will travel down towards the player. Now drag the asteroid parent onto the prefab folder so now we can delete the asteroid parent from the hierarchy.

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