protected JobHandle GenerateContacts(JobHandle inputDeps, float deltaTime)
{
// Dispose of previous fluid interactions.
// We need fluid data during interpolation, for anisotropic fluid particles. For this reason,
// we can't dispose of these arrays in ResetForces() at the end of each full step. They must use persistent allocation.
if (fluidInteractions.IsCreated)
{
fluidInteractions.Dispose();
}
if (fluidBatchData.IsCreated)
{
fluidBatchData.Dispose();
}
// get constraint parameters for constraint types that depend on broadphases:
var collisionParameters = m_Solver.GetConstraintParameters(Oni.ConstraintType.Collision);
var particleCollisionParameters = m_Solver.GetConstraintParameters(Oni.ConstraintType.ParticleCollision);
var densityParameters = m_Solver.GetConstraintParameters(Oni.ConstraintType.Density);
// if no enabled constraints that require broadphase info, skip it entirely.
if (collisionParameters.enabled ||
particleCollisionParameters.enabled ||
densityParameters.enabled)
{
// update the bounding box of each simplex:
inputDeps = UpdateSimplexBounds(inputDeps, deltaTime);
// generate particle-particle and particle-collider interactions in parallel:
JobHandle generateParticleInteractionsHandle = inputDeps, generateContactsHandle = inputDeps;
// particle-particle interactions (contacts, fluids)
if (particleCollisionParameters.enabled || densityParameters.enabled)
{
particleGrid.Update(this, deltaTime, inputDeps);
generateParticleInteractionsHandle = particleGrid.GenerateContacts(this, deltaTime);
}
// particle-collider interactions (contacts)
if (collisionParameters.enabled)
{
generateContactsHandle = colliderGrid.GenerateContacts(this, deltaTime);
}
JobHandle.CombineDependencies(generateParticleInteractionsHandle, generateContactsHandle).Complete();
// allocate arrays for interactions and batch data:
particleContacts = new NativeArray <BurstContact>(particleGrid.particleContactQueue.Count, Allocator.TempJob, NativeArrayOptions.UninitializedMemory);
particleBatchData = new NativeArray <BatchData>(maxBatches, Allocator.TempJob, NativeArrayOptions.UninitializedMemory);
fluidInteractions = new NativeArray <FluidInteraction>(particleGrid.fluidInteractionQueue.Count, Allocator.Persistent, NativeArrayOptions.UninitializedMemory);
fluidBatchData = new NativeArray <BatchData>(maxBatches, Allocator.Persistent, NativeArrayOptions.UninitializedMemory);
colliderContacts = new NativeArray <BurstContact>(colliderGrid.colliderContactQueue.Count, Allocator.TempJob, NativeArrayOptions.UninitializedMemory);
// dequeue contacts/interactions into temporary arrays:
var rawParticleContacts = new NativeArray <BurstContact>(particleGrid.particleContactQueue.Count, Allocator.TempJob, NativeArrayOptions.UninitializedMemory);
var sortedParticleContacts = new NativeArray <BurstContact>(particleGrid.particleContactQueue.Count, Allocator.TempJob, NativeArrayOptions.UninitializedMemory);
var rawFluidInteractions = new NativeArray <FluidInteraction>(particleGrid.fluidInteractionQueue.Count, Allocator.TempJob, NativeArrayOptions.UninitializedMemory);
DequeueIntoArrayJob <BurstContact> dequeueParticleContacts = new DequeueIntoArrayJob <BurstContact>()
{
InputQueue = particleGrid.particleContactQueue,
OutputArray = rawParticleContacts
};
DequeueIntoArrayJob <FluidInteraction> dequeueFluidInteractions = new DequeueIntoArrayJob <FluidInteraction>()
{
InputQueue = particleGrid.fluidInteractionQueue,
OutputArray = rawFluidInteractions
};
DequeueIntoArrayJob <BurstContact> dequeueColliderContacts = new DequeueIntoArrayJob <BurstContact>()
{
InputQueue = colliderGrid.colliderContactQueue,
OutputArray = colliderContacts
};
var dequeueHandle = JobHandle.CombineDependencies(dequeueParticleContacts.Schedule(), dequeueFluidInteractions.Schedule(), dequeueColliderContacts.Schedule());
// Sort contacts for jitter-free gauss-seidel (sequential) solving:
dequeueHandle = ConstraintSorter.SortConstraints <BurstContact>(simplexCounts.simplexCount, rawParticleContacts, ref sortedParticleContacts, dequeueHandle);
ContactProvider contactProvider = new ContactProvider()
{
contacts = sortedParticleContacts,
sortedContacts = particleContacts,
simplices = simplices,
simplexCounts = simplexCounts
};
FluidInteractionProvider fluidProvider = new FluidInteractionProvider()
{
interactions = rawFluidInteractions,
sortedInteractions = fluidInteractions,
};
// batch particle contacts:
var activeParticleBatchCount = new NativeArray <int>(1, Allocator.TempJob);
var particleBatchHandle = constraintBatcher.BatchConstraints(ref contactProvider, particleCount, ref particleBatchData, ref activeParticleBatchCount, dequeueHandle);
// batch fluid interactions:
var activeFluidBatchCount = new NativeArray <int>(1, Allocator.TempJob);
var fluidBatchHandle = constraintBatcher.BatchConstraints(ref fluidProvider, particleCount, ref fluidBatchData, ref activeFluidBatchCount, dequeueHandle);
JobHandle.CombineDependencies(particleBatchHandle, fluidBatchHandle).Complete();
// Generate particle contact/friction batches:
var pc = constraints[(int)Oni.ConstraintType.ParticleCollision] as BurstParticleCollisionConstraints;
pc.batches.Clear();
var pf = constraints[(int)Oni.ConstraintType.ParticleFriction] as BurstParticleFrictionConstraints;
pf.batches.Clear();
for (int i = 0; i < activeParticleBatchCount[0]; ++i)
{
var cbatch = pc.CreateConstraintsBatch() as BurstParticleCollisionConstraintsBatch;
cbatch.batchData = particleBatchData[i];
var fbatch = pf.CreateConstraintsBatch() as BurstParticleFrictionConstraintsBatch;
fbatch.batchData = particleBatchData[i];
}
// Generate fluid interaction batches:
var dc = constraints[(int)Oni.ConstraintType.Density] as BurstDensityConstraints;
dc.batches.Clear();
for (int i = 0; i < activeFluidBatchCount[0]; ++i)
{
var batch = dc.CreateConstraintsBatch() as BurstDensityConstraintsBatch;
batch.batchData = fluidBatchData[i];
}
// dispose of temporary buffers:
rawParticleContacts.Dispose();
rawFluidInteractions.Dispose();
sortedParticleContacts.Dispose();
activeParticleBatchCount.Dispose();
activeFluidBatchCount.Dispose();
}
return(inputDeps);
}