public PointLight(Vector3 position, Vector3 diffuse, float radius)
: base()
{
Position = position;
Diffuse = diffuse;
Radius = radius;
// [-1..1]
velocity = new Vector3(-1 + 2 * (float)UniversalRandom.GetInstance().NextDouble(),
-1 + 2 * (float)UniversalRandom.GetInstance().NextDouble(),
-1 + 2 * (float)UniversalRandom.GetInstance().NextDouble());
velocity.Normalize();
}
public virtual void Update(GameTime gameTime)
{
shake *= .9f;
if (shake > 0.01)
{
ShakeTransfomation *= Matrix.CreateTranslation(
20 * shake * (float)(UniversalRandom.GetInstance().NextDouble() - .5),
20 * shake * (float)(UniversalRandom.GetInstance().NextDouble() - .5), 0);
}
else
{
ShakeTransfomation = Matrix.Identity;
}
View *= ShakeTransfomation;
}
/// <summary>
/// Spawns particles on the surface of the box.
/// </summary>
/// <param name="b"></param>
/// <param name="yellowSystem"></param>
public static void IlluminateBoundingBox(this BoundingBox b, ParticleSystem yellowSystem)
{
for (int i = 0; i < 20; i++)
{
int face = UniversalRandom.GetInstance().Next(6);
float u = (float)UniversalRandom.GetInstance().NextDouble(),
v = (float)UniversalRandom.GetInstance().NextDouble();
var diff = b.Max - b.Min;
switch (face)
{
case 0:
yellowSystem.AddParticle(b.Min + new Vector3(u * diff.X, v * diff.Y, 0), Vector3.Zero);
break;
case 1:
yellowSystem.AddParticle(b.Min + new Vector3(0, v * diff.Y, u * diff.Z), Vector3.Zero);
break;
case 2:
yellowSystem.AddParticle(b.Min + new Vector3(diff.X, v * diff.Y, u * diff.Z), Vector3.Zero);
break;
case 3:
yellowSystem.AddParticle(b.Min + new Vector3(u * diff.X, v * diff.Y, diff.Z), Vector3.Zero);
break;
case 4:
yellowSystem.AddParticle(b.Min + new Vector3(u * diff.X, 0, v * diff.Z), Vector3.Zero);
break;
case 5:
yellowSystem.AddParticle(b.Min + new Vector3(u * diff.X, diff.Y, v * diff.Z), Vector3.Zero);
break;
}
}
}
