public void Render(GraphicsDeviceManager graphics, Matrix cameraViewMatrix, Matrix cameraProjectionMatrix, ParticleSystem system, Entity camera)
{
// TODO: Fix.
Vector3 ps = new Vector3(pos.X, pos.Y, pos.Z);
if (relativePosition)
{
ps += system.position;
}
Matrix billboardMatrix = Matrix.CreateBillboard(pos, camera.position, camera.getUpVector(), camera.getForwardVector());
if (quad == null)
{
}
quad = new Quad(ps, Vector3.Backward, Vector3.Up, size, size);
quadVertexDeclaration = new VertexDeclaration(graphics.GraphicsDevice, VertexPositionNormalTexture.VertexElements);
foreach (VertexPositionNormalTexture v in quad.Vertices)
{
Vector3.Transform(v.Position, billboardMatrix);
}
graphics.GraphicsDevice.VertexDeclaration = quadVertexDeclaration;
graphics.GraphicsDevice.DrawUserIndexedPrimitives
<VertexPositionNormalTexture>(
PrimitiveType.TriangleList,
quad.Vertices, 0, 4,
quad.Indexes, 0, 2);
}
public void Update(float t, ParticleSystem system)
{
vel += acc * t;
pos += vel * t;
angle += rot * t;
age += t;
float progress = age / maxAge;
color = Color.Lerp(startColor, endColor, progress);
// Kill if too old
if (age >= maxAge) dying = true;
// Kill if too far
float distance2 = relativePosition ? pos.LengthSquared() : (system.position - pos).LengthSquared();
if (distance2 > (maxDistance * maxDistance)) dying = true;
alpha = normalAlpha;
if (dying && dyingTime > 0)
{
dyingAge += t;
alpha = MathHelper.Lerp(normalAlpha, 0, dyingAge/dyingTime);
}
if (dying && dyingAge > dyingTime) dead = true;
}
public Particle CreateParticle(GameTime time, float t, ParticleSystem particleSystem)
{
Random r = new Random();
Particle p = new Particle();
p.sprite = sprites[r.Next(sprites.Count)];
p.pos = new Vector3(randomFloat(r, particleSpread), randomFloat(r, particleSpread), randomFloat(r, particleSpread));
p.maxAge = particleLifeTime;
p.maxDistance = particleSpread;
p.angle = randomFloat(r, 180);
p.normalAlpha = alpha;
p.rot = rot;
p.relativePosition = relativePosition;
if (!relativePosition)
{
p.pos += particleSystem.position;
}
return p;
}