// The code actually running on the job
public void Execute(int index)
{
int i = activeParticles[index];
// Project particles on the XY plane if we are in 2D mode:
if (is2D)
{
// restrict position to the 2D plane
float4 pos = positions[i];
pos[2] = previousPositions[i][2];
positions[i] = pos;
// restrict rotation to the axis perpendicular to the 2D plane.
quaternion swing, twist;
BurstMath.SwingTwist(orientations[i], new float3(0, 0, 1), out swing, out twist);
orientations[i] = twist;
}
if (inverseMasses[i] > 0)
{
velocities[i] = BurstIntegration.DifferentiateLinear(positions[i], previousPositions[i], deltaTime);
}
else
{
velocities[i] = float4.zero;
}
if (inverseRotationalMasses[i] > 0)
{
angularVelocities[i] = BurstIntegration.DifferentiateAngular(orientations[i], previousOrientations[i], deltaTime);
}
else
{
angularVelocities[i] = float4.zero;
}
}