/// <summary>
/// Spawns the number of asteroids needed to reach maxAsteroids
/// </summary>
/// <param name='atSpawnDistance'>
/// true = spawn on sphere at distanceSpawn * range (used for respawning asteroids)
/// false = spawn in sphere within distanceSpawn * range (used for brand new asteroid fields)
/// </param>
void SpawnAsteroids(bool atSpawnDistance)
{
// Spawn new asteroids at a distance if count is below maxAsteroids (e.g. asteroids were destroyed outside of this script)
while (_asteroidsTransforms.Count < maxAsteroids)
{
// Select a random asteroid from the prefab array
GameObject _newAsteroidPrefab = prefabAsteroids[Random.Range(0, prefabAsteroids.Length)];
Vector3 _newPosition = Vector3.zero;
if (atSpawnDistance)
{
// Spawn asteroid at spawn distance (this is used for existing asteroid fields so it spawns out of visible range)
_newPosition = _transform.position + Random.onUnitSphere * _distanceToSpawn;
}
else
{
// Spawn asteroid anywhere within range (this is used for new asteroid fields before it becomes visible)
_newPosition = _transform.position + Random.insideUnitSphere * _distanceToSpawn;
}
// Instantiate the new asteroid at a random location
GameObject _newAsteroid = Instantiate(_newAsteroidPrefab, _newPosition, _transform.rotation);
Renderer _renderer = _newAsteroid.GetComponent <Renderer>();
SU_Asteroid _asteroid = _newAsteroid.GetComponent <SU_Asteroid>();
// Add the asteroid to a list used to keep track of them
_asteroidsTransforms.Add(_newAsteroid.transform);
// Set a random material of the asteroid based on the weighted probabilty list
switch (WeightedRandom(_materialList))
{
case "VeryCommon":
_renderer.sharedMaterial = materialVeryCommon[Random.Range(0, materialVeryCommon.Length)];
break;
case "Common":
_renderer.sharedMaterial = materialCommon[Random.Range(0, materialCommon.Length)];
break;
case "Rare":
_renderer.sharedMaterial = materialRare[Random.Range(0, materialRare.Length)];
break;
case "VeryRare":
_renderer.sharedMaterial = materialVeryRare[Random.Range(0, materialVeryRare.Length)];
break;
}
// Add the asteroid to a list used to keep track of them
_asteroidsTransforms.Add(_newAsteroid.transform);
// If the asteroid has the Asteroid script attached to it...
if (_asteroid != null)
{
// Set the mesh of the asteroid based on chosen polycount
_asteroid.SetPolyCount(polyCount);
// If the asteroid has a collider...
if (_newAsteroid.GetComponent <Collider>() != null)
{
_asteroid.SetPolyCount(polyCountCollider, true);
}
}
// Set scale of asteroid within min/max scale * scaleMultiplier
float _newScale = Random.Range(minAsteroidScale, maxAsteroidScale) * scaleMultiplier;
_newAsteroid.transform.localScale = new Vector3(_newScale, _newScale, _newScale);
// Set a random orientation of the asteroid
_newAsteroid.transform.eulerAngles = new Vector3(Random.Range(0, 360), Random.Range(0, 360), Random.Range(0, 360));
Rigidbody _rigidbody = _newAsteroid.GetComponent <Rigidbody>();
if (isRigidbody)
{
// RIGIDBODY ASTEROIDS
// If the asteroid prefab has a rigidbody...
if (_rigidbody != null)
{
// Set the mass to mass specified in AsteroidField mutiplied by scale
_rigidbody.mass = mass * _newScale;
// Set the velocity (speed) of the rigidbody to within the min/max velocity range multiplier by velocityMultiplier
_rigidbody.velocity = _newAsteroid.transform.forward * Random.Range(minAsteroidVelocity, maxAsteroidVelocity) * velocityMultiplier;
// Set the angular velocity (rotational speed) of the rigidbody to within the min/max velocity range multiplier by velocityMultiplier
_rigidbody.angularVelocity = new Vector3(Random.Range(0.0f, 1.0f), Random.Range(0.0f, 1.0f), Random.Range(0.0f, 1.0f)) * Random.Range(minAsteroidAngularVelocity, maxAsteroidAngularVelocity) * angularVelocityMultiplier;
}
else
{
Debug.LogWarning("AsteroidField is set to spawn rigidbody asterodids but one or more asteroid prefabs do not have rigidbody component attached.");
}
}
else
{
// NON-RIGIDBODY ASTEROIDS
// If the asteroid prefab has a rigidbody...
if (_rigidbody != null)
{
// Destroy the rigidbody since the asteroid field is spawning non-rigidbody asteroids
Destroy(_rigidbody);
}
// If the asteroid has the Asteroid script attached to it...
if (_asteroid != null)
{
// Set rotation and drift axis and speed
_asteroid.rotationSpeed = Random.Range(minAsteroidRotationSpeed, maxAsteroidRotationSpeed);
_asteroid.rotationalAxis = new Vector3(Random.Range(0.0f, 1.0f), Random.Range(0.0f, 1.0f), Random.Range(0.0f, 1.0f));
_asteroid.driftSpeed = Random.Range(minAsteroidDriftSpeed, maxAsteroidDriftSpeed);
_asteroid.driftAxis = new Vector3(Random.Range(0.0f, 1.0f), Random.Range(0.0f, 1.0f), Random.Range(0.0f, 1.0f));
}
}
}
}
void OnEnable()
{
// Cache reference to transform to increase performance
_transform = transform;
// Calculate the actual spawn
_distanceToSpawn = range * distanceSpawn;
// Populate the material list based on probabilty of materials
if (_materialList.Count == 0)
{
if (materialVeryRare.Length > 0)
{
_materialList.Add(5, "VeryRare");
}
if (materialRare.Length > 0)
{
_materialList.Add(5 + 15, "Rare");
}
if (materialCommon.Length > 0)
{
_materialList.Add(5 + 15 + 30, "Common");
}
if (materialVeryCommon.Length != 0)
{
_materialList.Add(5 + 15 + 30 + 50, "VeryCommon");
}
else
{
Debug.LogError("Asteroid Field must have at least one Material in the 'Material Very Common' Array.");
}
}
// Check if there are any asteroid objects that was spawned prior to this script being disabled
// If there are asteroids in the list, activate the gameObject again.
for (int i = 0; i < _asteroidsTransforms.Count; i++)
{
_asteroidsTransforms[i].gameObject.SetActive(true);
}
// Spawn new asteroids in the entire sphere (not just at spawn range, hence the "false" parameter)
SpawnAsteroids(false);
// Use transform as origin (center) of asteroid field. If null, use this transform.
if (asteroidFieldOriginTransform == null)
{
asteroidFieldOriginTransform = transform;
}
// Set the parameters for each asteroid for fading/scaling
for (int i = 0; i < _asteroidsTransforms.Count; i++)
{
SU_Asteroid _a = _asteroidsTransforms[i].GetComponent <SU_Asteroid>();
if (_a != null)
{
// When spawning asteroids, set the parameters for the shader based on parameters of this asteroid field
_a.fadeAsteroids = fadeAsteroids;
_a.fadeAsteroidsFalloffExponent = 1f; // fadeAsteroidsFalloffExponent;
_a.distanceFade = distanceFade;
_a.visibilityRange = range;
}
}
}