From 7e0289b618f55921cd1d441dc75ee863312b4cce Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastia=CC=81n=20Barschkis?= <sebbas@sebbas.org>
Date: Tue, 14 Jul 2020 22:15:00 +0200
Subject: Fluid: Updated Mantaflow source files

New files include fixes for obj mesh import and minor cleanups.
---
 extern/mantaflow/helper/util/vectorbase.h         | 12 +++++++-----
 extern/mantaflow/preprocessed/fileio/iomeshes.cpp | 19 +++++++++++++------
 extern/mantaflow/preprocessed/gitinfo.h           |  2 +-
 3 files changed, 21 insertions(+), 12 deletions(-)

diff --git a/extern/mantaflow/helper/util/vectorbase.h b/extern/mantaflow/helper/util/vectorbase.h
index 41584663a0f..9ccf445f42c 100644
--- a/extern/mantaflow/helper/util/vectorbase.h
+++ b/extern/mantaflow/helper/util/vectorbase.h
@@ -248,12 +248,14 @@ template<class S> class Vector3D {
  protected:
 };
 
-//! helper to check whether float/double value is non-zero
-inline bool notZero(Real f)
+//! helper to check whether value is non-zero
+template<class S> inline bool notZero(S v)
 {
-  if (std::abs(f) > VECTOR_EPSILON)
-    return true;
-  return false;
+  return (std::abs(v) > VECTOR_EPSILON);
+}
+template<class S> inline bool notZero(Vector3D<S> v)
+{
+  return (std::abs(norm(v)) > VECTOR_EPSILON);
 }
 
 //************************************************************************
diff --git a/extern/mantaflow/preprocessed/fileio/iomeshes.cpp b/extern/mantaflow/preprocessed/fileio/iomeshes.cpp
index 1c50376de77..b5e51625077 100644
--- a/extern/mantaflow/preprocessed/fileio/iomeshes.cpp
+++ b/extern/mantaflow/preprocessed/fileio/iomeshes.cpp
@@ -315,10 +315,14 @@ int readObjFile(const std::string &name, Mesh *mesh, bool append)
     return 0;
   }
 
+  const Real dx = mesh->getParent()->getDx();
+  const Vec3 gs = toVec3(mesh->getParent()->getGridSize());
+
   if (!append)
     mesh->clear();
   int nodebase = mesh->numNodes();
-  int cnt = nodebase;
+  int cntNodes = nodebase, cntNormals = nodebase;
+
   while (ifs.good() && !ifs.eof()) {
     string id;
     ifs >> id;
@@ -333,19 +337,23 @@ int readObjFile(const std::string &name, Mesh *mesh, bool append)
     }
     else if (id == "vn") {
       // normals
-      if (!mesh->numNodes()) {
+      if (mesh->numNodes() != cntNodes) {
         errMsg("invalid amount of nodes");
         return 0;
       }
-      Node n = mesh->nodes(cnt);
-      ifs >> n.normal.x >> n.normal.y >> n.normal.z;
-      cnt++;
+      Node *n = &mesh->nodes(cntNormals);
+      ifs >> n->normal.x >> n->normal.y >> n->normal.z;
+      cntNormals++;
     }
     else if (id == "v") {
       // vertex
       Node n;
       ifs >> n.pos.x >> n.pos.y >> n.pos.z;
+      // convert to grid space
+      n.pos /= dx;
+      n.pos += gs * 0.5;
       mesh->addNode(n);
+      cntNodes++;
     }
     else if (id == "g") {
       // group
@@ -408,7 +416,6 @@ int writeObjFile(const string &name, Mesh *mesh)
   // write normals
   for (int i = 0; i < numVerts; i++) {
     Vector3D<float> n = toVec3f(mesh->nodes(i).normal);
-    // normalize to unit cube around 0
     ofs << "vn " << n.value[0] << " " << n.value[1] << " " << n.value[2] << " "
         << "\n";
   }
diff --git a/extern/mantaflow/preprocessed/gitinfo.h b/extern/mantaflow/preprocessed/gitinfo.h
index 73ff70b10a0..03dcbb3d9c5 100644
--- a/extern/mantaflow/preprocessed/gitinfo.h
+++ b/extern/mantaflow/preprocessed/gitinfo.h
@@ -1,3 +1,3 @@
 
 
-#define MANTA_GIT_VERSION "commit d80d3c821de74315ab26b5efd153d41477b976c4"
+#define MANTA_GIT_VERSION "commit 7395d36e3f504edbdabe34b30edc855b422c7baa"
-- 
cgit v1.2.3