/// <summary>
/// Initializes a particle based on the emitter's approach and parameters.
/// </summary>
/// <remarks>
/// See the GetEmissionCount method for details of why there is a separation between
/// 'requested' emissions and actual initialized particles.
/// </remarks>
/// <param name="particle">Reference to a particle which must be initialized based on how this emitter starts particles</param>
public virtual void InitParticle(Particle particle)
{
particle.ResetDimensions();
}
/// <summary>
/// Initializes a particle based on the emitter's approach and parameters.
/// </summary>
/// <remarks>
/// See the GetEmissionCount method for details of why there is a separation between
/// 'requested' emissions and actual initialized particles.
/// </remarks>
/// <param name="particle">Reference to a particle which must be initialized based on how this emitter starts particles</param>
public virtual void InitParticle(Particle particle)
{
particle.ResetDimensions();
}
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
MathUtil.RangeRandom(durationMin, durationMax);
alpha = MathUtil.RangeRandom(0,MathUtil.TWO_PI);
beta = MathUtil.RangeRandom(0,MathUtil.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 = MathUtil.RangeRandom(InnerX,1.0f);
b = MathUtil.RangeRandom(InnerY,1.0f);
c = MathUtil.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 * MathUtil.Cos(alpha) * MathUtil.Sin(beta);
y = b * MathUtil.Sin(alpha) * MathUtil.Sin(beta);
z = c * MathUtil.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(particle.Color);
GenerateEmissionDirection(ref particle.Direction);
GenerateEmissionVelocity(ref particle.Direction);
// Generate simpler data
particle.timeToLive = GenerateEmissionTTL();
}