public override void InitParticle( Particle particle )
{
float alpha, beta, a, b, c, x, y, z;
particle.ResetDimensions();
// create two random angles alpha and beta
// with these two angles, we are able to select any point on an
// ellipsoid's surface
Utility.RangeRandom( durationMin, durationMax );
alpha = Utility.RangeRandom( 0, Utility.TWO_PI );
beta = Utility.RangeRandom( 0, Utility.PI );
// create three random radius values that are bigger than the inner
// size, but smaller/equal than/to the outer size 1.0 (inner size is
// between 0 and 1)
a = Utility.RangeRandom( InnerX, 1.0f );
b = Utility.RangeRandom( InnerY, 1.0f );
c = Utility.RangeRandom( InnerZ, 1.0f );
// with a,b,c we have defined a random ellipsoid between the inner
// ellipsoid and the outer sphere (radius 1.0)
// with alpha and beta we select on point on this random ellipsoid
// and calculate the 3D coordinates of this point
x = a * Utility.Cos( alpha ) * Utility.Sin( beta );
y = b * Utility.Sin( alpha ) * Utility.Sin( beta );
z = c * Utility.Cos( beta );
// scale the found point to the ellipsoid'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();
}
