public override void InitParticle( Particle particle )
{
float alpha, a, b, x, y, z;
// create a random angle from 0 .. PI*2
alpha = Utility.RangeRandom( 0, Utility.TWO_PI );
// create two random radius values that are bigger than the inner size
a = Utility.RangeRandom( InnerX, 1.0f );
b = Utility.RangeRandom( InnerY, 1.0f );
// with a and b we have defined a random ellipse inside the inner
// ellipse and the outer circle (radius 1.0)
// with alpha, and a and b we select a random point on this ellipse
// and calculate it's coordinates
x = a * Utility.Sin( alpha );
y = b * Utility.Cos( alpha );
// the height is simple running from 0 to 1
z = Utility.UnitRandom(); // 0..1
// scale the found point to the ring's size and move it
// relatively to the center of the emitter point
particle.Position = position + x * xRange + y * yRange + z * zRange;
// Generate complex data by reference
GenerateEmissionColor( ref particle.Color );
GenerateEmissionDirection( ref particle.Direction );
GenerateEmissionVelocity( ref particle.Direction );
// Generate simpler data
particle.timeToLive = GenerateEmissionTTL();
}
