public override Task <Entity> CreateEntity(EntityHierarchyItemViewModel parent)
{
var name = ComputeNewName(parent, "Simple particle system");
var component = new ParticleSystemComponent();
var emitter = new ParticleEmitter {
ParticleLifetime = new Vector2(1, 2)
};
// 100 Particles per second
var spawner = new SpawnerPerSecond();
emitter.Spawners.Add(spawner);
// Size
var randSize = new InitialSizeSeed {
RandomSize = new Vector2(0.05f, 0.1f)
};
emitter.Initializers.Add(randSize);
// Position
emitter.Initializers.Add(new InitialPositionSeed());
// Velocity
var randVel = new InitialVelocitySeed
{
VelocityMin = new Vector3(-0.5f, 1f, -0.5f),
VelocityMax = new Vector3(0.5f, 3, 0.5f)
};
emitter.Initializers.Add(randVel);
// Gravity
var gravity = new UpdaterForceField
{
EnergyConservation = 1f,
FieldShape = null
};
gravity.FieldFalloff.StrengthInside = gravity.FieldFalloff.StrengthOutside = 1f;
gravity.ForceFixed = new Vector3(0, -9.81f, 0);
gravity.ForceDirected = gravity.ForceRepulsive = gravity.ForceVortex = 0f;
emitter.Updaters.Add(gravity);
component.ParticleSystem.Emitters.Add(emitter);
return(CreateEntityWithComponent(name, component));
}
public override Task <Entity> CreateEntity(EntityHierarchyItemViewModel parent)
{
var name = ComputeNewName(parent, "Smoke particle system");
var component = new ParticleSystemComponent();
var emitter = new ParticleEmitter {
ParticleLifetime = new Vector2(1, 2)
};
// 20 Particle per second
var spawner = new SpawnerPerSecond {
SpawnCount = 20
};
emitter.Spawners.Add(spawner);
// Size
var randSize = new InitialSizeSeed {
RandomSize = new Vector2(0.35f, 0.55f)
};
emitter.Initializers.Add(randSize);
// Position
var randPos = new InitialPositionSeed
{
PositionMin = new Vector3(-0.2f, 0, -0.2f),
PositionMax = new Vector3(0.2f, 0, 0.2f)
};
emitter.Initializers.Add(randPos);
// Velocity
var randVel = new InitialVelocitySeed
{
VelocityMin = new Vector3(-0.5f, 1f, -0.5f),
VelocityMax = new Vector3(0.5f, 3, 0.5f)
};
emitter.Initializers.Add(randVel);
component.ParticleSystem.Emitters.Add(emitter);
return(CreateEntityWithComponent(name, component));
}
public override Task <Entity> CreateEntity(EntityHierarchyItemViewModel parent)
{
var name = ComputeNewName(parent, "Ribbon particle system");
var component = new ParticleSystemComponent();
var emitter = new ParticleEmitter {
ParticleLifetime = new Vector2(2, 2)
};
// 30 Particles per second
var spawner = new SpawnerPerSecond {
SpawnCount = 30
};
emitter.Spawners.Add(spawner);
// Ribbon
var ribbonShape = new ShapeBuilderRibbon
{
SmoothingPolicy = SmoothingPolicy.Best,
Segments = 15,
TextureCoordinatePolicy = TextureCoordinatePolicy.Stretched,
TexCoordsFactor = 1f
};
emitter.ShapeBuilder = ribbonShape;
// Velocity
var randVel = new InitialVelocitySeed
{
VelocityMin = new Vector3(-0.15f, 3f, -0.15f),
VelocityMax = new Vector3(0.15f, 3, 0.15f)
};
emitter.Initializers.Add(randVel);
// Spawn Order
var initialOrder = new InitialSpawnOrder();
emitter.Initializers.Add(initialOrder);
// Size by Lifetime
var sizeCurve = new ComputeAnimationCurveFloat();
var key0 = new AnimationKeyFrame <float>
{
Key = 0,
Value = 0.1f
};
var key1 = new AnimationKeyFrame <float>
{
Key = 0.9f,
Value = 0f
};
sizeCurve.KeyFrames.Add(key0);
sizeCurve.KeyFrames.Add(key1);
var sizeAnimation = new UpdaterSizeOverTime {
SamplerMain = { Curve = sizeCurve }
};
emitter.Updaters.Add(sizeAnimation);
emitter.SortingPolicy = EmitterSortingPolicy.ByOrder;
component.ParticleSystem.Emitters.Add(emitter);
return(CreateEntityWithComponent(name, component));
}
public void EmitterUpdate()
{
var emitter = new ParticleEmitter();
var dummyParticleSystem = new ParticleSystem();
const float dt = 0.0166666666667f;
// Updating the emitter forces the creation of a default spawner (100 particles per second)
emitter.Update(dt, dummyParticleSystem);
var forceField = new UpdaterForceField();
emitter.Updaters.Add(forceField);
var positionSeed = new InitialPositionSeed();
emitter.Initializers.Add(positionSeed);
var velocitySeed = new InitialVelocitySeed();
emitter.Initializers.Add(velocitySeed);
// Fixed delta time for simulating 60 fps
var totalTime = 0f;
// Simulate 10 seconds
while (totalTime < 10)
{
emitter.Update(dt, dummyParticleSystem);
totalTime += dt;
}
emitter.Updaters.Remove(forceField);
// Simulate 10 seconds
while (totalTime < 10)
{
emitter.Update(dt, dummyParticleSystem);
totalTime += dt;
}
emitter.Initializers.Remove(positionSeed);
// Simulate 10 seconds
while (totalTime < 10)
{
emitter.Update(dt, dummyParticleSystem);
totalTime += dt;
}
emitter.Updaters.Add(forceField);
emitter.Initializers.Add(positionSeed);
// Simulate 10 seconds
while (totalTime < 10)
{
emitter.Update(dt, dummyParticleSystem);
totalTime += dt;
}
// The emitter update doesn't assert anything as the state of the particle system will be difficult to predict
// Such tests will be part of the GraphicsTests
}
