public void Initialize(Vector3 position, Vector3 normal, Vector3 velocity, [NotNull] Transform parent)
{
var size = _splatters.Core.DecalSize;
if (_splatters.RandomizeSize.Enabled)
{
size *= Random.Range(_splatters.RandomizeSize.MinInflation, _splatters.RandomizeSize.MaxInflation);
}
var rotationAngle = Mathf.Acos(Vector3.Dot(Vector3.up, normal)) * Mathf.Rad2Deg;
var rotationAxis = Vector3.Cross(Vector3.up, normal).normalized;
var orientation = Quaternion.AngleAxis(rotationAngle, rotationAxis);
position += normal * _splatters.Core.VerticalOffset;
// Modify the transform according to the particle impact velocity
if (_splatters.ImpactVelocity.Enabled)
{
// Project impact velocity onto plane defined by collision normal
var velocityOnPlane = velocity - Vector3.Dot(velocity, normal) * normal;
var speedOnPlane = velocityOnPlane.magnitude;
var dirOnPlane = velocityOnPlane / speedOnPlane;
// Align with impact velocity (randomised orientation should be equally spread around this axis)
var impactOrientation = Quaternion.LookRotation(dirOnPlane, Vector3.up);
orientation *= impactOrientation;
// Stretch along impact direction according to impact speed
var stretch = _splatters.ImpactVelocity.Scale.Evaluate(speedOnPlane);
size.z *= stretch;
// Offset position according to impact speed and length
var offset = _splatters.ImpactVelocity.Offset.Evaluate(speedOnPlane);
position += dirOnPlane * offset * size.z;
}
// Randomize the orientation. Rotating a max of half the range ccw, and half the range cw (i.e. distributing the rotation around the current facing direction)
if (_splatters.RandomizeOrientation.Enabled)
{
orientation *= Quaternion.AngleAxis((Random.value - 0.5f) * _splatters.RandomizeOrientation.RandomDegrees, Vector3.up);
}
var worldTransform = Matrix4x4.TRS(position, orientation, size);
_parent = parent;
_localTransform = parent.worldToLocalMatrix * worldTransform;
_totalLifetime = _splatters.Lifetime.Enabled
? Random.Range(_splatters.Lifetime.MinLifetime, _splatters.Lifetime.MaxLifetime)
: 1;
_remainingLifetime = _totalLifetime;
AgeingRate = 1;
_render = _splatters._decalSystem.Add(this);
}
protected virtual void OnEnable()
{
Log.Trace("OnEnable");
_settings.Init();
_settings.Changed += OnSettingsChanged;
if (_system == null)
{
_system = new WetDecalSystem();
}
_render = _system.Add(this);
RequireUpdate(UpdateType.Rebuild, true);
}
