/// <summary>
/// clears all internal forces for the spring
/// </summary>
public static void ClearForces(ref Spring spring)
{
spring.m_InternalFrames = 0;
spring.m_InternalSoftForce = float3.zero;
spring.m_InternalForce = float3.zero;
}
/// <summary>
/// adds a force distributed over up to 120 fixed frames
/// </summary>
public static void AddSoftForce(ref DynamicBuffer <SoftForceElement> softForce, ref Spring spring, float3 force,
float frames, float timeScale)
{
force /= timeScale;
frames = Mathf.Clamp(frames, 1, 120);
AddForceInternal(ref spring, force / frames, timeScale);
for (int v = 0; v < (Mathf.RoundToInt(frames) - 1); v++)
{
softForce[v] += (force / frames);
}
}
/// <summary>
/// instantly kills any forces added to the spring, gradually
/// easing them back in over 'seconds'.
/// this is useful when you need a spring to freeze up for a
/// brief amount of time, then slowly relaxing back to normal.
/// </summary>
public static void ForceVelocityFadeIn(ref Spring spring, float seconds)
{
spring.VelocityFadeInLength = seconds;
spring.VelocityFadeInEndTime = Time.time + seconds;
spring.VelocityFadeInCap = 0.0f;
}
/// <summary>
/// stops spring velocity and resets state to the static
/// equilibrium
/// </summary>
private static void Reset(ref Spring spring)
{
spring.Velocity = float3.zero;
spring.State = spring.RestState;
}