private void UpdateParticleSystem(ParticleSystemComponentState state, float deltaTime)
{
var speed = state.ParticleSystemComponent.Speed;
var transformComponent = state.TransformComponent;
var particleSystem = state.ParticleSystemComponent.ParticleSystem;
// We must update the TRS location of the particle system prior to updating the system itself.
// Particles only handle uniform scale.
if (transformComponent.Parent is null)
{
// The transform doesn't have a parent. Local transform IS world transform
particleSystem.Translation = transformComponent.Position; // Local position
particleSystem.UniformScale = transformComponent.Scale.X; // Local scale
particleSystem.Rotation = transformComponent.Rotation; // Local rotation
}
else
{
transformComponent.WorldMatrix.Decompose(out _, out particleSystem.Rotation, out particleSystem.Translation);
// Rotation breaks uniform scaling, so only inherit the X-scaling manually
float xScale = transformComponent.Scale.X;
var nextParent = transformComponent.Parent;
while (nextParent != null)
{
xScale *= nextParent.Scale.X;
nextParent = nextParent.Parent;
}
particleSystem.UniformScale = xScale;
}
particleSystem.Update(deltaTime * speed);
}
internal void UpdateParticleSystem(ParticleSystemComponentState state, float deltaTime)
{
var speed = state.ParticleSystemComponent.Speed;
var transformComponent = state.TransformComponent;
var particleSystem = state.ParticleSystemComponent.ParticleSystem;
// We must update the TRS location of the particle system prior to updating the system itself.
// Particles only handle uniform scale.
if (transformComponent.Parent == null)
{
// The transform doesn't have a parent. Local transform IS world transform
particleSystem.Translation = transformComponent.Position; // This is the local position!
particleSystem.UniformScale = transformComponent.Scale.X; // This is the local scale!
particleSystem.Rotation = transformComponent.Rotation; // This is the local rotation!
}
else
{
// TODO: Check transformComponent.WorldMatrix.Decompose(out scale, out rot, out pos);
// The transform has a parent - do not use local transform values, instead check the world matrix
// Position
particleSystem.Translation = new Vector3(transformComponent.WorldMatrix.M41, transformComponent.WorldMatrix.M42, transformComponent.WorldMatrix.M43);
// Scale
var uniformScaleX = new Vector3(transformComponent.WorldMatrix.M11, transformComponent.WorldMatrix.M12, transformComponent.WorldMatrix.M13);
particleSystem.UniformScale = uniformScaleX.Length();
// Rotation
// TODO Maybe implement Quaternion.RotationMatrix which also handles cases when the matrix has scaling?
var invScl = (particleSystem.UniformScale > 0) ? 1f / particleSystem.UniformScale : 1f;
var rotMatrix = new Matrix(
transformComponent.WorldMatrix.M11 * invScl, transformComponent.WorldMatrix.M12 * invScl, transformComponent.WorldMatrix.M13 * invScl, 0,
transformComponent.WorldMatrix.M21 * invScl, transformComponent.WorldMatrix.M22 * invScl, transformComponent.WorldMatrix.M23 * invScl, 0,
transformComponent.WorldMatrix.M31 * invScl, transformComponent.WorldMatrix.M32 * invScl, transformComponent.WorldMatrix.M33 * invScl, 0,
0, 0, 0, 1);
Quaternion.RotationMatrix(ref rotMatrix, out particleSystem.Rotation);
}
particleSystem.Update(deltaTime * speed);
}
public override void HandleComponentState(dynamic _state)
{
ParticleSystemComponentState state = (ParticleSystemComponentState)_state;
foreach (var a in state.emitters)
{
if (_emitters.ContainsKey(a.Key))
{
SetParticleSystemActive(a.Key, a.Value);
}
else
{
AddParticleSystem(a.Key, a.Value);
}
}
foreach (var toRemove in new List <string>(_emitters.Keys.Except <string>(state.emitters.Keys))) //Remove emitters that are not in the new state.
{
RemoveParticleSystem(toRemove);
}
}
/// <inheritdoc />
protected override void OnEntityComponentRemoved(Entity entity, ParticleSystemComponent component, ParticleSystemComponentState data)
{
// TODO: Reset low-level data only. This method also gets called when moving the entity in the hierarchy!
// component.ParticleSystem.Dispose();
component.ParticleSystem.ResetSimulation();
}
/// <inheritdoc />
protected override void OnEntityComponentAdding(Entity entity, ParticleSystemComponent component, ParticleSystemComponentState data)
{
// Do some particle system initialization
}
/// <inheritdoc />
protected override bool IsAssociatedDataValid(Entity entity, ParticleSystemComponent component, ParticleSystemComponentState associatedData)
{
return
(component == associatedData.ParticleSystemComponent &&
entity.Transform == associatedData.TransformComponent);
}
/// <inheritdoc />
protected override void OnEntityComponentRemoved(Entity entity, ParticleSystemComponent component, ParticleSystemComponentState data)
{
component.ParticleSystem.Dispose();
}