/// <summary>
/// Gets output for angle.
/// </summary>
/// <param name="translation">Translation.</param>
/// <param name="parameter">Parameter.</param>
/// <param name="particles">Particles.</param>
/// <param name="particleIndex">Index of particle.</param>
/// <returns>Output value.</returns>
private float GetOutputAngle(
Vector2 translation,
CubismParameter parameter,
CubismPhysicsParticle[] particles,
int particleIndex
)
{
var parentGravity = -CubismPhysics.Gravity;
if (CubismPhysics.UseAngleCorrection && (particleIndex - 1) != 0)
{
parentGravity = particles[particleIndex - 2].Position -
particles[particleIndex - 1].Position;
}
translation.y *= -1.0f;
var outputValue = CubismPhysicsMath.DirectionToRadian(-parentGravity, -translation);
outputValue = (((-translation.x) - (-parentGravity.x)) > 0.0f)
? -outputValue
: outputValue;
if (IsInverted)
{
outputValue *= -1.0f;
}
return(outputValue);
}
/// <summary>
/// Gets output for angle.
/// </summary>
/// <param name="translation">Translation.</param>
/// <param name="parameter">Parameter.</param>
/// <param name="particles">Particles.</param>
/// <param name="particleIndex">Index of particle.</param>
/// <param name="gravity">Gravity.</param>
/// <returns>Output value.</returns>
private float GetOutputAngle(
Vector2 translation,
CubismParameter parameter,
CubismPhysicsParticle[] particles,
int particleIndex,
Vector2 gravity
)
{
var parentGravity = Vector2.zero;
if (CubismPhysics.UseAngleCorrection)
{
if (particleIndex < 2)
{
parentGravity = gravity;
parentGravity.y *= -1.0f;
}
else
{
parentGravity = particles[particleIndex - 1].Position -
particles[particleIndex - 2].Position;
}
}
else
{
parentGravity = gravity;
parentGravity.y *= -1.0f;
}
var outputValue = CubismPhysicsMath.DirectionToRadian(parentGravity, translation);
if (IsInverted)
{
outputValue *= -1.0f;
}
return(outputValue);
}
/// <summary>
/// Updates particles in every frame.
/// </summary>
/// <param name="strand">Particles.</param>
/// <param name="totalTranslation">Total translation.</param>
/// <param name="totalAngle">Total angle.</param>
/// <param name="wind">Direction of wind.</param>
/// <param name="thresholdValue">Value of threshold.</param>
/// <param name="deltaTime">Time of delta.</param>
private void UpdateParticles(
CubismPhysicsParticle[] strand,
Vector2 totalTranslation,
float totalAngle,
Vector2 wind,
float thresholdValue,
float deltaTime
)
{
strand[0].Position = totalTranslation;
var totalRadian = CubismPhysicsMath.DegreesToRadian(totalAngle);
var currentGravity = CubismPhysicsMath.RadianToDirection(totalRadian);
currentGravity.Normalize();
for (var i = 1; i < strand.Length; ++i)
{
strand[i].Force = (currentGravity * strand[i].Acceleration) + wind;
strand[i].LastPosition = strand[i].Position;
// The Cubism Editor expects 30 FPS so we scale here by 30...
var delay = strand[i].Delay * deltaTime * 30.0f;
var direction = strand[i].Position - strand[i - 1].Position;
var radian = CubismPhysicsMath.DirectionToRadian(strand[i].LastGravity, currentGravity) / CubismPhysics.AirResistance;
direction.x = ((Mathf.Cos(radian) * direction.x) - (direction.y * Mathf.Sin(radian)));
direction.y = ((Mathf.Sin(radian) * direction.x) + (direction.y * Mathf.Cos(radian)));
strand[i].Position = strand[i - 1].Position + direction;
var velocity = strand[i].Velocity * delay;
var force = strand[i].Force * delay * delay;
strand[i].Position = strand[i].Position + velocity + force;
var newDirection = strand[i].Position - strand[i - 1].Position;
newDirection.Normalize();
strand[i].Position = strand[i - 1].Position + newDirection * strand[i].Radius;
if (Mathf.Abs(strand[i].Position.x) < thresholdValue)
{
strand[i].Position.x = 0.0f;
}
if (delay != 0.0f)
{
strand[i].Velocity =
((strand[i].Position - strand[i].LastPosition) / delay) * strand[i].Mobility;
}
strand[i].Force = Vector2.zero;
strand[i].LastGravity = currentGravity;
}
}
