union error for manifolds about manifold

[pca006132]

OK I have found a way to reproduce an error in SimplifyTopology. Symptom is different but this one is much simpler.

// current master
#include "manifold.h"
#include "meshIO.h"

using namespace manifold;

int main() {
  auto foo = Manifold::Cube({1.2, 1, 1}, true).Translate({0, -0.5, 0.5});
  foo += Manifold::Cube({1, 0.8, 0.5}).Translate({-0.5, 0, 0.5});
  foo += Manifold::Cube({1.2, 0.1, 0.5}).Translate({-0.6, -0.1, 0});
  ExportMesh("foo.glb", foo.GetMesh(), {});
  return 0;
}

which produced this:

[elalish]

Thanks for the succinct repro; I'll take a look.

[elalish]

Thanks, I'll take a look at this while I've fixing the other infinite loop edge collapse bug.