remove SetTolerance

Tolerance value is set before the mesh is created, when SimplfiyTopology
cannot be called.

src/impl.cpp

@@ -569,19 +569,7 @@ Manifold::Impl Manifold::Impl::Transform(const mat3x4& transform_) const {
  */
 void Manifold::Impl::SetEpsilon(double minEpsilon) {
   epsilon_ = MaxEpsilon(minEpsilon, bBox_);
-  SetTolerance(std::max(tolerance_, epsilon_));
-}
-
-void Manifold::Impl::SetTolerance(double newTolerance) {
-  if (newTolerance > tolerance_) {
-    // increased tolerance -> simplify opportunity
-    tolerance_ = newTolerance;
-    SimplifyTopology();
-  } else {
-    // for reducing tolerance, we need to make sure it is still at least
-    // equal to epsilon.
-    tolerance_ = std::max(epsilon_, newTolerance);
-  }
+  tolerance_ = std::max(tolerance_, epsilon_);
 }
 
 /**

src/impl.h

@@ -277,7 +277,6 @@ struct Manifold::Impl {
   bool IsFinite() const;
   bool IsIndexInBounds(VecView<const ivec3> triVerts) const;
   void SetEpsilon(double minEpsilon = -1);
-  void SetTolerance(double minTolerance);
   bool IsManifold() const;
   bool Is2Manifold() const;
   bool MatchesTriNormals() const;

src/manifold.cpp

@@ -382,7 +382,9 @@ double Manifold::GetEpsilon() const {
 
 Manifold Manifold::SetEpsilon(double epsilon) const {
   auto impl = std::make_shared<Impl>(*GetCsgLeafNode().GetImpl());
+  auto oldTolerance = impl->tolerance_;
   impl->SetEpsilon(epsilon);
+  if (impl->tolerance_ > oldTolerance) impl->SimplifyTopology();
   return Manifold(impl);
 }
 
@@ -400,7 +402,14 @@ double Manifold::GetTolerance() const {
  */
 Manifold Manifold::SetTolerance(double tolerance) const {
   auto impl = std::make_shared<Impl>(*GetCsgLeafNode().GetImpl());
-  impl->SetTolerance(tolerance);
+  if (tolerance > impl->tolerance_) {
+    impl->tolerance_ = tolerance;
+    impl->SimplifyTopology();
+  } else {
+    // for reducing tolerance, we need to make sure it is still at least
+    // equal to epsilon.
+    impl->tolerance_ = std::max(impl->epsilon_, tolerance);
+  }
   return Manifold(impl);
 }