public override void Draw()
{
base.Draw();
if (!ShouldDrawParticles)
{
return;
}
var direction = -Vector3.Normalize(ControlledVelocity);
float thickness = 0.025f;
float speed = ControlledVelocity.Length();
float length = (float)MathHelper.Clamp(speed / 50.0f, 0.0, 1.0);
foreach (var particle in m_activeParticles)
{
if (!particle.Active)
{
continue;
}
MyTransparentGeometry.AddLineBillboard(particle.Material, particle.Color, particle.Position, direction, length, thickness);
}
}
public override void UpdateBeforeSimulation()
{
base.UpdateBeforeSimulation();
ProfilerShort.Begin("SpaceParticles.UpdateBeforeSimulation");
try
{
if (!ShouldDrawParticles)
{
return;
}
if (ControlledVelocity.Length() < 10.0f)
{
return;
}
var distance = ParticleSpawnDistance;
var angle = Math.PI / 2.0f;
var tanFovSq = 1.0f; // Math.Tan(angle / 2.0f);
var velocityVector = ControlledVelocity - 8.5f * Vector3.Normalize(ControlledVelocity);
var sweepArea = 4 * distance * distance * tanFovSq;
m_particlesLeftToSpawn += (float)((0.25f + MyRandom.Instance.NextFloat() * 1.25f) * velocityVector.Length() * sweepArea * ParticleDensity * VRage.Game.MyEngineConstants.UPDATE_STEP_SIZE_IN_MILLISECONDS); // particles/update
if (m_particlesLeftToSpawn < 1.0f)
{
return;
}
var minAngle = angle / 2.0f;
var maxAngle = minAngle + angle;
var phi = minAngle + MyRandom.Instance.NextFloat() * (maxAngle - minAngle);
var theta = minAngle + MyRandom.Instance.NextFloat() * (maxAngle - minAngle);
var restrictedAngleAmount = 6.0f;
while (m_particlesLeftToSpawn-- >= 1.0f)
{
float degree = (float)Math.PI / 180.0f;
if (Math.Abs(phi - Math.PI / 2.0) < restrictedAngleAmount * degree && Math.Abs(theta - Math.PI / 2.0) < restrictedAngleAmount * degree)
{
phi += (Math.Sign(MyRandom.Instance.NextFloat()) * restrictedAngleAmount * degree);
theta += (Math.Sign(MyRandom.Instance.NextFloat()) * restrictedAngleAmount * degree);
}
var sinTheta = (float)Math.Sin(theta);
var cosTheta = (float)Math.Cos(theta);
var sinPhi = (float)Math.Sin(phi);
var cosPhi = (float)Math.Cos(phi);
var upVector = MySector.MainCamera.UpVector;
var forwardVector = Vector3.Normalize(velocityVector);
var leftVector = Vector3.Cross(forwardVector, -upVector);
Vector3 particlePosition = MySector.MainCamera.Position
+ distance * (upVector * cosTheta
+ leftVector * sinTheta * cosPhi
+ forwardVector * sinTheta * sinPhi);
Spawn(particlePosition);
m_lastParticleSpawn = MySandboxGame.TotalGamePlayTimeInMilliseconds;
}
}
finally
{
ProfilerShort.End();
}
}
