//===========================================================
// Particle Update Functions
//===========================================================
protected void UpdateParticleFireSmokeColor(DefaultSprite3DBillboardTextureCoordinatesParticle particle, float elapsedTimeInSeconds)
{
// Have particle be the specified color for the first part of its lifetime
float firstPartOfLifetime = 0.2f;
if (particle.NormalizedElapsedTime < firstPartOfLifetime)
{
particle.Color = particle.StartColor;
}
// Then start fading it to black to look like smoke
else
{
float lerpAmount = (particle.NormalizedElapsedTime - firstPartOfLifetime) * (1.0f / (1.0f - firstPartOfLifetime));
particle.Color = DPSFHelper.LerpColor(particle.StartColor, particle.EndColor, lerpAmount);
}
}
public void InitializeParticleSnow(DefaultTexturedQuadParticle cParticle)
{
// Position the Snow within 500 units of the emitter
Vector3 sPosition = Emitter.PositionData.Position;
sPosition.Y = 200;
sPosition.X += RandomNumber.Next(-500, 500);
sPosition.Z += RandomNumber.Next(-500, 500);
cParticle.Lifetime = 0.0f;
cParticle.Position = sPosition;
cParticle.Size = RandomNumber.Next(2, 5);
cParticle.Color = DPSFHelper.LerpColor(new Color(255, 255, 255, 50), new Color(255, 255, 255, 255), RandomNumber.NextFloat());
cParticle.Orientation = Orientation3D.Rotate(Matrix.CreateRotationZ(RandomNumber.Between(0, MathHelper.TwoPi)), cParticle.Orientation);
cParticle.Velocity = new Vector3(RandomNumber.Next(-10, 3), RandomNumber.Next(-15, -5), RandomNumber.Next(-10, 10));
cParticle.Acceleration = Vector3.Zero;
cParticle.RotationalVelocity.Z = RandomNumber.Between(-MathHelper.PiOver2, MathHelper.PiOver2);
}
