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This commit is contained in:
BobSong
2026-01-01 22:00:33 +08:00
parent 040a222bd6
commit 9ceffccd39
1800 changed files with 103929 additions and 139495 deletions
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60
Assets/Obi/Scripts/Common/Backends/Burst/Constraints/Volume/BurstVolumeConstraintsBatch.cs
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@@ -40,7 +40,7 @@ namespace Obi
}
public override JobHandle Evaluate(JobHandle inputDeps, float stepTime, float substepTime, int steps, float timeLeft)
public override JobHandle Evaluate(JobHandle inputDeps, float stepTime, float substepTime, int substeps)
{
var projectConstraints = new VolumeConstraintsBatchJob()
{
@@ -106,7 +106,10 @@ namespace Obi
{
float compliance = pressureStiffness[i].y / deltaTimeSqr;
NativeList<int> particleIndices = new NativeList<int>(numTriangles[i] * 3, Allocator.Temp);
// calculate volume:
float volume = 0;
for (int j = 0; j < numTriangles[i]; ++j)
{
int v = (firstTriangle[i] + j) * 3;
@@ -114,12 +117,21 @@ namespace Obi
int i2 = triangles[v + 1];
int i3 = triangles[v + 2];
gradients[i1] = new float4(0, 0, 0, 1);
gradients[i2] = new float4(0, 0, 0, 1);
gradients[i3] = new float4(0, 0, 0, 1);
particleIndices.Add(i1);
particleIndices.Add(i2);
particleIndices.Add(i3);
//calculate this triangle's volume contribution:
volume += math.dot(math.cross(positions[i1].xyz, positions[i2].xyz), positions[i3].xyz) / 6.0f;
}
float volume = 0;
particleIndices.Sort();
int particleCount = particleIndices.AsArray().Unique();
// accumulate particle gradients:
for (int j = 0; j < particleCount; ++j)
gradients[particleIndices[j]] = float4.zero;
for (int j = 0; j < numTriangles[i]; ++j)
{
int v = (firstTriangle[i] + j) * 3;
@@ -131,28 +143,14 @@ namespace Obi
gradients[i1] += new float4(math.cross(positions[i2].xyz, positions[i3].xyz), 0);
gradients[i2] += new float4(math.cross(positions[i3].xyz, positions[i1].xyz), 0);
gradients[i3] += new float4(math.cross(positions[i1].xyz, positions[i2].xyz), 0);
//calculate this triangle's volume contribution:
volume += math.dot(math.cross(positions[i1].xyz, positions[i2].xyz), positions[i3].xyz) / 6.0f;
}
// calculate constraint denominator (G(Cj)*inv(M)):
float denominator = 0;
for (int j = 0; j < numTriangles[i]; ++j)
for (int j = 0; j < particleCount; ++j)
{
int v = (firstTriangle[i] + j) * 3;
int i1 = triangles[v];
int i2 = triangles[v + 1];
int i3 = triangles[v + 2];
denominator += invMasses[i1] * math.lengthsq(gradients[i1].xyz) * gradients[i1].w;
gradients[i1] = new float4(gradients[i1].xyz,0);
denominator += invMasses[i2] * math.lengthsq(gradients[i2].xyz) * gradients[i2].w;
gradients[i2] = new float4(gradients[i2].xyz, 0);
denominator += invMasses[i3] * math.lengthsq(gradients[i3].xyz) * gradients[i3].w;
gradients[i3] = new float4(gradients[i3].xyz, 0);
int p = particleIndices[j];
denominator += invMasses[p] * math.lengthsq(gradients[p]);
}
// equality constraint: volume - pressure * rest volume = 0
@@ -163,21 +161,11 @@ namespace Obi
lambdas[i] += dlambda;
// calculate position deltas:
for (int j = 0; j < numTriangles[i]; ++j)
for (int j = 0; j < particleCount; ++j)
{
int v = (firstTriangle[i] + j) * 3;
int i1 = triangles[v];
int i2 = triangles[v + 1];
int i3 = triangles[v + 2];
deltas[i1] += dlambda * invMasses[i1] * gradients[i1];
counts[i1]++;
deltas[i2] += dlambda * invMasses[i2] * gradients[i2];
counts[i2]++;
deltas[i3] += dlambda * invMasses[i3] * gradients[i3];
counts[i3]++;
int p = particleIndices[j];
deltas[p] += dlambda * invMasses[p] * gradients[p];
counts[p]++;
}
}
}