private void AddSparks()
{
float maxRate = 100.0f;
float numToGen = maxRate * Time.GameTimeFrameSeconds + leftOvers;
int numSparks = (int)numToGen;
if (numSparks > kMaxSparks)
{
numSparks = kMaxSparks;
}
leftOvers = numToGen - numSparks;
Vector3 worldCenter = WorldCenter;
Vector3 line = worldCenter + TexW * Radius * (1.0f - 2.0f * Age);
float r = (float)Math.Sqrt(Radius * Radius - (line - worldCenter).LengthSquared());
Random rnd = BokuGame.bokuGame.rnd;
float speed = 0.5f;
for (int i = 0; i < numSparks; ++i)
{
double ang = rnd.NextDouble() * Math.PI * 2.0;
float sing = (float)Math.Sin(ang);
float cosg = (float)Math.Cos(ang);
_velocities[i] = TexU * cosg + TexV * sing;
_positions[i] = line + _velocities[i] * r;
_velocities[i] *= speed;
}
ExplosionManager.CreateSparks(numSparks, _positions, _velocities, 0.05f);
}