public void SimulateParticles(ParticleEmitterComponent component, ForcesComponent forces, TransformComponent transform)
{
if (component.IsEnabled)
{
this.SimulationEffect.Velocity = component.Velocity.ReadTarget;
this.SimulationEffect.Position = component.Position.ReadTarget;
this.SimulationEffect.InitialVelocity = component.InitialVelocity.ReadTarget;
this.SimulationEffect.LengthScale = component.LengthScale;
this.SimulationEffect.FieldSpeed = component.FieldSpeed;
this.SimulationEffect.NoiseStrength = component.NoiseStrength;
this.SimulationEffect.ProgressionRate = component.ProgressionRate;
this.SimulationEffect.SpherePosition = component.SpherePosition;
this.SimulationEffect.SphereRadius = component.SphereRadius;
this.SimulationEffect.EmitterSize = component.Size;
this.SimulationEffect.MaxLifeTime = component.MaxLifeTime;
this.SimulationEffect.Elapsed = this.FrameService.Elapsed;
this.SimulationEffect.Time = this.FrameService.Time;
this.SimulationEffect.ParentVelocity = forces.Velocity;
this.SimulationEffect.ObjectToWorld = transform.Matrix;
this.SimulationEffect.WorldToObject = Matrix.Invert(transform.Matrix);
this.SimulationEffect.ApplyParticleVelocitySimulationTechnique();
this.Device.SetRenderTarget(component.Velocity.WriteTarget);
this.PostProcessTriangle.Render(this.Device);
this.SimulationEffect.ApplyParticlePositionSimulationTechnique();
this.Device.SetRenderTargets(component.Position.WriteTarget, component.InitialVelocity.WriteTarget);
this.PostProcessTriangle.Render(this.Device);
component.Swap();
}
}
public (ParticleEmitterComponent, TransformComponent, BoundingSphereComponent, ForcesComponent) Create(int paticleCount)
{
var entity = this.Entities.Create();
var particleEmitter = new ParticleEmitterComponent(entity, this.Device, paticleCount);
var transform = new TransformComponent(entity);
var bounds = new BoundingSphereComponent(entity, 1.0f); // Automatically adjusted by particle system
var forces = new ForcesComponent(entity);
this.Components.Add(particleEmitter, transform, bounds, forces);
return(particleEmitter, transform, bounds, forces);
}
