Reactor.PointParticleSystem.AddParticle C# (CSharp) Method

        public void AddParticle(Vector3 position, Vector3 velocity)
        {
            // Figure out where in the circular queue to allocate the new particle.
            int nextFreeParticle = firstFreeParticle + 1;

            if (nextFreeParticle >= particles.Length)
                nextFreeParticle = 0;

            // If there are no free particles, we just have to give up.
            if (nextFreeParticle == firstRetiredParticle)
                return;

            // Adjust the input velocity based on how much
            // this particle system wants to be affected by it.
            velocity *= settings.EmitterVelocitySensitivity;

            // Add in some random amount of horizontal velocity.
            float horizontalVelocity = MathHelper.Lerp(settings.MinHorizontalVelocity,
                                                       settings.MaxHorizontalVelocity,
                                                       (float)random.NextDouble());

            double horizontalAngle = random.NextDouble() * MathHelper.TwoPi;

            velocity.X += horizontalVelocity * (float)Math.Cos(horizontalAngle);
            velocity.Z += horizontalVelocity * (float)Math.Sin(horizontalAngle);

            // Add in some random amount of vertical velocity.
            velocity.Y += MathHelper.Lerp(settings.MinVerticalVelocity,
                                          settings.MaxVerticalVelocity,
                                          (float)random.NextDouble());

            // Choose four random control values. These will be used by the vertex
            // shader to give each particle a different size, rotation, and color.
            Color randomValues = new Color((byte)random.Next(255),
                                           (byte)random.Next(255),
                                           (byte)random.Next(255),
                                           (byte)random.Next(255));

            // Fill in the particle vertex structure.
            particles[firstFreeParticle].Position = position;
            particles[firstFreeParticle].Velocity = velocity;
            particles[firstFreeParticle].Random = randomValues;
            particles[firstFreeParticle].Time = currentTime;

            firstFreeParticle = nextFreeParticle;
        }