question about the ShapeMatchingConstraint3d

[absolutemind]

double wsum = 0.0;
int numParticles = Body.NumParticles;

for (int i = 0; i < numParticles; i++)
{
     RestCm += Body.Positions[i] * mass;
     wsum += mass;
}

RestCm /= wsum;

Is the result of RestCm equal to the sum of body positions?

int numParticles = Body.NumParticles;
double wsum = mass * numParticles;
for (int i = 0; i < numParticles; i++)
{
     RestCm += Body.Positions[i];
}