void MinError(Edge edge, out Vector3 minPos, out float minError, out Quality q)
{
var vi0 = vertexInfos[edge.v0];
var vi1 = vertexInfos[edge.v1];
q = vi0.quad + vi1.quad;
try {
var minPosD = q.MinError();
minError = (float)(q * minPosD);
minPos = (Vector3)minPosD;
} catch (nobnak.Algebra.SingularMatrixException) {
MinErrorOnEdge(vi0, vi1, q, out minPos, out minError);
}
}
