koobas.hobune.stream
Avoid overlapping of random spawned prefab
I used a code to spawn 2 different prefabs .The script is working but sometimes the objects get's overlapped ,and I can't figure out how to avoid this overlapping.
void SpawnSpike()
{
//the bottom point of the screen
Vector2 min = Camera.main.ViewportToWorldPoint (new Vector2 (0, 0));
//this is the top-right point of the screen
Vector2 max = Camera.main.ViewportToWorldPoint (new Vector2 (1, 1));
//instantiate an enemy1
GameObject anSpikesGO = (GameObject)Instantiate (SpikesGO);
anSpikesGO.transform.position = new Vector2 (Random.Range (-min.x, -max.x), -max.y);
//Schedule when to spawn next enemy
ScheduleNextSpikeSpawn ();
}
void ScheduleNextSpikeSpawn()
{
float spawnInSeconds;
if (maxSpawnRateInSeconds > 2f)
{
//pick a number between 1 to max
spawnInSeconds = Random.Range (2f, maxSpawnRateInSeconds);
}
else
spawnInSeconds = 2f;
Invoke ("SpawnSpike", spawnInSeconds);
}
Cast Physics.OverlapBox or similar shape before instantiation, using the object's renderer.bounds as the shape dimensions and casting against the layer the other already existing objects are in.
Use Physics2D to check if the spawn position is occupied and keep checking random positions until you find a blank space.
int attempts = 0;
do {
// Get a Random spawn Position
if(!Physics2D.OverlapArea(topLeft, BottomRight)) { // Check the bounds of the spawn position
break;
}
Debug.Log("Collision during spawn at: " + temp);
} while (++attempts <= 10); // Limit spawn attempts to prevent infinite loop
if(attempts > 10) {
Debug.Log("Failed to find a clear spawn point");
}
There's several ways to accomplish this but I think the easiest would be to use a collider or trigger and using tags. If it collided with an object with the same take, re-position it again using random range, as you have done.
use raycast using the object witht/hight divided / 2 as the max distance on -x, +x,-y,+y directions. if it returns anything repeat until you find a proper spot.
