From 7c984e12da23b88cfb4660835a701ab5a0ff4948 Mon Sep 17 00:00:00 2001
From: Paolo Cignoni <paolo.cignoni@isti.cnr.it>
Date: Tue, 20 Feb 2018 10:24:29 +0100
Subject: [PATCH] Added WedgeTexMergeClose that Merge supposedly wrong
 texcoords

---
 vcg/complex/algorithms/update/texture.h | 33 +++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/vcg/complex/algorithms/update/texture.h b/vcg/complex/algorithms/update/texture.h
index c2ff6f92..5b380366 100644
--- a/vcg/complex/algorithms/update/texture.h
+++ b/vcg/complex/algorithms/update/texture.h
@@ -48,6 +48,7 @@ typedef typename MeshType::VertexIterator VertexIterator;
 typedef typename MeshType::FaceType       FaceType;
 typedef typename MeshType::FacePointer    FacePointer;
 typedef typename MeshType::FaceIterator   FaceIterator;
+typedef typename vcg::Point2<ScalarType> UVCoordType;
 
 static void WedgeTexFromPlane(ComputeMeshType &m, const Point3<ScalarType> &uVec, const Point3<ScalarType> &vVec, bool aspectRatio, ScalarType sideGutter=0.0)
 {
@@ -138,6 +139,38 @@ static void WedgeTexRemoveNull(ComputeMeshType &m, const std::string &texturenam
 		}											
 			
 }
+/** \brief Merge supposedly wrong texcoords 
+ * It can happens that for rounding errors texcoords on different wedges but on the same vertex have different tex coords.
+ * This function merges them according a threshold. It requires initialized VF adjacency. 
+ * the default for merging is if two textures dist less than one 16th of texel on a 4k texture...
+*/
+
+static void WedgeTexMergeClose(ComputeMeshType &m, ScalarType mergeThr = ScalarType(1.0/65536.0) )
+{
+  tri::RequireVFAdjacency(m);
+  
+  ForEachVertex(m, [&](VertexType &v){
+    face::VFIterator<FaceType> vfi(&v);
+    std::vector<UVCoordType> clusterVec;
+    clusterVec.push_back(vfi.F()->WT(vfi.I()).P());
+    ++vfi;
+    while(!vfi.End())
+    {
+      UVCoordType cur= vfi.F()->WT(vfi.I()).P();
+      bool merged=false;
+      for(auto p:clusterVec) {
+        if(Distance(p,cur) < mergeThr){ 
+          vfi.F()->WT(vfi.I()).P()=p;
+          merged=true;
+        }
+      }
+      if(!merged) 
+        clusterVec.push_back(cur);
+      
+      ++vfi;      
+    }
+  });    
+}
 
 }; // end class