What is the current workflow for spawning prefabs as entities?
For my use case - i need to spawn missiles, each with a simple int Value on them.
Im still trying to grok Authoring classes, and a lot of the information I searched is out of date and uses old hybrid stuff.
apkdev
February 7, 2025, 10:27am
2
The workflow for instantiating entities is very similar to how you instantiate GameObjects.
Take a look at the samples repository, you’ll find some goodies there. Some scenarios similar to the one you’re describing:
// Remove the NewSpawn tag component from the entities spawned in the prior frame.
var newSpawnQuery = SystemAPI.QueryBuilder().WithAll<NewSpawn>().Build();
state.EntityManager.RemoveComponent<NewSpawn>(newSpawnQuery);
// Spawn the boxes
var prefab = SystemAPI.GetSingleton<Config>().Prefab;
state.EntityManager.Instantiate(prefab, count, Allocator.Temp);
// Every spawned box needs a unique seed, so the
// seedOffset must be incremented by the number of boxes every frame.
seedOffset += count;
new RandomPositionJob
{
SeedOffset = seedOffset
}.ScheduleParallel();
// For every player, spawn a ball, position it at the player's location, and give it a random velocity.
foreach (var transform in
SystemAPI.Query<RefRO<LocalTransform>>()
.WithAll<Player>())
{
var ball = state.EntityManager.Instantiate(config.BallPrefab);
state.EntityManager.SetComponentData(ball, new LocalTransform
{
Position = transform.ValueRO.Position,
Rotation = quaternion.identity,
Scale = 1
});
state.EntityManager.SetComponentData(ball, new Velocity
{
// NextFloat2Direction() returns a random 2d unit vector.
Value = rand.NextFloat2Direction() * config.BallStartVelocity
});
}
1 Like
Thank you!