/// <summary>
/// Spawns prefab instances from particles that have died since the last update.
/// </summary>
void SpawnInstancesFromParticles()
{
// If there are no alive sorted particles, then skip doing anything else.
if (sortedParticleCount <= 0)
{
return;
}
// Determine the number of newly destroyed particles.
int particleCount = SpriteExploder.GetParticleCount();
int destroyedCount = sortedParticleCount - particleCount;
// If there are newly destroyed particles, then we'll potentially spawn
// instances of the prefab in their place.
if (destroyedCount > 0)
{
Texture2D texture = SpriteExploder.GetTexture();
Vector2 flipVector = SpriteExploder.GetFlipVector2();
// Enumerate through the destroyed count and spawn instances where
// the particle tile's texture color isn't clear in the center.
for (int i = 0; i < destroyedCount; i++)
{
// The Sprite Exploder works by sending index values in the custom
// data stream to the shader. The index value is stored in the x property.
int tileIndex = (int)customDatas[i].x;
// With the particle tile index, we can get the tile X and y values
// from the Sprite Exploder.
int tileX = SpriteExploder.GetTileX(tileIndex, tileCountX);
if (flipVector.x < 0)
{
tileX = tileCountX - tileX;
}
int tileY = SpriteExploder.GetTileY(tileIndex, tileCountY);
if (flipVector.y < 0)
{
tileY = tileCountY - tileY;
}
// With tile x and y values, we can determing the texture x and y
// values of particle tile.
int tileCenterPixelX = tileX * pixelSize + centerOffset;
int tileCenterPixelY = tileY * pixelSize + centerOffset;
Color color = texture.GetPixel(tileCenterPixelX, tileCenterPixelY);
// If the center particle is totally clear then skip making an
// instance since the tile will likely look empty or too small.
if (color.a <= 0.0f)
{
continue;
}
// Get a reference to the particle and its current color.
ParticleSystem.Particle particle = particles[i];
Color32 spawnColor = particle.GetCurrentColor(spriteExploderParticleSystem);
// Spawn an instance of the prefab with the particle's transform data and color
GameObject instance = Spawn(particle.position, particleScale, particle.rotation, particle.velocity, particle.angularVelocity, spawnColor);
// Invoke the OnInstanceCreated event for any outside class that are handling that.
OnInstanceCreated?.Invoke(instance);
}
}
// Update the custom particle data
UpdateCustomParticleData();
// If there are no more particles, then invoke the completed event.
if (sortedParticleCount <= 0)
{
OnCompleted?.Invoke();
}
}
