public void UpdateForce(IParticle particle, double duration)
{
if (particle.IsInfiniteMass == true) return;
// Calculate relative position of the particle from the anchor
Vector3 positionFromAnchor = particle.Position - Anchor;
// Calculate the value for Gamma
var gamma = 0.5 * Math.Sqrt((4 * SpringConstant) - (Damping * Damping));
if (gamma == 0.0) return;
// Calculate the value for the C constant
var c = (positionFromAnchor * (Damping / (2.0 * gamma))) + (particle.Velocity * (1.0 / gamma));
// Calculate the target position (in two parts)
var tagetPosition = (positionFromAnchor * Math.Cos(gamma * duration)) + (c * Math.Sin(gamma*duration));
tagetPosition *= Math.Exp(0.5 * duration * Damping);
// Calculate the acceleration needed (and hence the force)
var acceleration = ((tagetPosition - positionFromAnchor) * (1.0 / (duration * duration))) -
(particle.Velocity * duration);
// Add the force to the particle
particle.AddForce(acceleration * particle.Mass);
}
public void UpdateForce(IParticle particle, double duration)
{
if (particle.IsInfiniteMass == false)
{
particle.AddForce(Gravity * particle.Mass);
}
}
public void UpdateForce(IParticle particle, double duration)
{
if (particle.IsInfiniteMass == false)
{
particle.AddForce(Gravity * particle.Mass);
}
}
public void UpdateForce(IParticle particle, double duration)
{
if (particle.IsInfiniteMass == true)
{
return;
}
// Calculate relative position of the particle from the anchor
Vector3 positionFromAnchor = particle.Position - Anchor;
// Calculate the value for Gamma
var gamma = 0.5 * Math.Sqrt((4 * SpringConstant) - (Damping * Damping));
if (gamma == 0.0)
{
return;
}
// Calculate the value for the C constant
var c = (positionFromAnchor * (Damping / (2.0 * gamma))) + (particle.Velocity * (1.0 / gamma));
// Calculate the target position (in two parts)
var tagetPosition = (positionFromAnchor * Math.Cos(gamma * duration)) + (c * Math.Sin(gamma * duration));
tagetPosition *= Math.Exp(0.5 * duration * Damping);
// Calculate the acceleration needed (and hence the force)
var acceleration = ((tagetPosition - positionFromAnchor) * (1.0 / (duration * duration))) -
(particle.Velocity * duration);
// Add the force to the particle
particle.AddForce(acceleration * particle.Mass);
}
public void UpdateForce(IParticle particle, double duration)
{
var springVector = particle.Position - OtherParticle.Position;
var springExtension = springVector.Magnitude - RestLength;
if (((springExtension < 0.0f) && IsBungeeSpring)) return;
var springForce = (SpringConstant * springExtension) * springVector.Normal.Inverse;
particle.AddForce(springForce);
}
public void UpdateForce(IParticle particle, double duration)
{
var speedSquared = particle.Velocity.SquareMagnitude;
var speed = Math.Sqrt(speedSquared);
var dragMagnitude = (K1 * speed) + (K2 * speedSquared);
var force = new Vector3(particle.Velocity.Normal.Inverse * dragMagnitude);
particle.AddForce(force);
}
public void UpdateForce(IParticle particle, double duration)
{
var speedSquared = particle.Velocity.SquareMagnitude;
var speed = Math.Sqrt(speedSquared);
var dragMagnitude = (K1 * speed) + (K2 * speedSquared);
var force = new Vector3(particle.Velocity.Normal.Inverse * dragMagnitude);
particle.AddForce(force);
}
public void UpdateForce(IParticle particle, double duration)
{
var springVector = particle.Position - OtherParticle.Position;
var springExtension = springVector.Magnitude - RestLength;
if (((springExtension < 0.0f) && IsBungeeSpring))
{
return;
}
var springForce = (SpringConstant * springExtension) * springVector.Normal.Inverse;
particle.AddForce(springForce);
}
public void UpdateForce(IParticle particle, double duration)
{
var particleHeight = particle.Position.Y;
// Check if we are out of the water - if so, return as there is no buoyancy force to add
if (particleHeight >= LiquidHeight + MaximumDepth) return;
// Fully submerged buoyancy force
var force = new Vector3 {Y = LiquidDensity * Volume};
// If partially submerged, adjust the buoyancy force based on how deep the object is
if (particleHeight > LiquidHeight - MaximumDepth)
{
var amountSubmerged = (LiquidHeight - particleHeight) / (MaximumDepth);
force.Y *= amountSubmerged;
}
particle.AddForce(force);
}
public void UpdateForce(IParticle particle, double duration)
{
var particleHeight = particle.Position.Y;
// Check if we are out of the water - if so, return as there is no buoyancy force to add
if (particleHeight >= LiquidHeight + MaximumDepth)
{
return;
}
// Fully submerged buoyancy force
var force = new Vector3 {
Y = LiquidDensity * Volume
};
// If partially submerged, adjust the buoyancy force based on how deep the object is
if (particleHeight > LiquidHeight - MaximumDepth)
{
var amountSubmerged = (LiquidHeight - particleHeight) / (MaximumDepth);
force.Y *= amountSubmerged;
}
particle.AddForce(force);
}