public UnmanagedSimulation(int maxNumParticles)
{
SoAData soaData =new SoAData(maxNumParticles);
_systemData = soaData;
_systemDataStreams = soaData;
_worldBounds = new object();
_is2D = false;
}
public SphereEmitter(IParameters parameters)
: base(parameters)
{
_particlesToEmit = new SoAData(200);
_Radius = Parameters.GetParameterDelegate<float>("Radius");
_EmitRingOnly = Parameters.GetParameterDelegate<bool>("EmitRingOnly");
}
public StandardSimulation(int maxNumParticles)
{
_systemData = new SoAData(maxNumParticles);
_worldBounds = new object();
_is2D = false;
}
protected override void _EmitParticles(int numParticlesToEmit, float oneOverPPS, float dt, float pt, out ISystemData particlesToEmit)
{
// TODO: Pool this stuff
if (_particlesToEmit.MaxNumParticles < numParticlesToEmit)
_particlesToEmit = new SoAData(numParticlesToEmit);
const int numBatches = 0;
int numRemainder = numParticlesToEmit;
float initialMass = _InitialMass(pt);
float initialSpeed = _InitialSpeed(pt);
float initialLifespan = _InitialLifespan(pt);
bool emitOnSurfaceOnly = _EmitOnSurfaceOnly(pt);
bool emitRingOnly = _EmitRingOnly(pt);
float radius = _Radius(pt);
// Emit remaining particles individually
int numBatchesTimesFour = numBatches * 4;
for (int i = 0; i < numRemainder; i++) {
// Calculate pos on circle with a random angle
float angle = (float)(RandomSource.NextDouble()) * MathF.TwoPI;
float posX = MathF.Cos(angle) * radius;
float posY = MathF.Sin(angle) * radius;
float posZ = emitRingOnly ? 0.0f : MathF.Sin((float)(RandomSource.NextDouble()) * MathF.TwoPI) * radius;
// If this emitter is supposed to emit only on the surface
// don't need to get a random distance
if (!emitOnSurfaceOnly) {
float distance = (float)RandomSource.NextDouble();
posX *= distance;
posY *= distance;
posZ *= distance;
}
// Transform position
// TODO: Matrix and transform stuff
// Length
float len = MathF.Sqrt((posX * posX) + (posY * posY) + (posZ * posZ));
// Normalize
float velX = posX / len;
float velY = posY / len;
float velZ = posZ / len;
// Scale by speed
velX *= initialSpeed;
velY *= initialSpeed;
velZ *= initialSpeed;
// Avoid clumping by doing some pre-simulation
float preSimTime = (i + 1) * oneOverPPS;
if (oneOverPPS > 0) {
posX += velX * preSimTime;
posY += velY * preSimTime;
posZ += velZ * preSimTime;
}
// Store out position
_particlesToEmit._positionStreamX[numBatchesTimesFour + i] = posX;
_particlesToEmit._positionStreamY[numBatchesTimesFour + i] = posY;
_particlesToEmit._positionStreamZ[numBatchesTimesFour + i] = posZ;
// Store out velocity
_particlesToEmit._velocityStreamX[numBatchesTimesFour + i] = velX;
_particlesToEmit._velocityStreamY[numBatchesTimesFour + i] = velY;
_particlesToEmit._velocityStreamZ[numBatchesTimesFour + i] = velZ;
// Store out lifespan and mass
float lifespan = initialLifespan - preSimTime;
_particlesToEmit._lifespanStream[numBatchesTimesFour + i] = lifespan;
_particlesToEmit._timeRemainingStream[numBatchesTimesFour + i] = lifespan;
_particlesToEmit._massStream[numBatchesTimesFour + i] = initialMass;
}
// Assign number of particles
_particlesToEmit._numParticles = numParticlesToEmit;
// Assign the output variable
particlesToEmit = _particlesToEmit;
}