From 7b0464603df9555d3300aaa54500cb1f62577874 Mon Sep 17 00:00:00 2001
From: Paolo Cignoni <paolo.cignoni@isti.cnr.it>
Date: Tue, 20 Feb 2018 14:04:01 +0100
Subject: [PATCH] Added texture clean sample

---
 apps/sample/sample.pro                        |  1 +
 .../trimesh_texture_clean.cpp                 | 79 +++++++++++++++++++
 .../trimesh_texture_clean.pro                 |  4 +
 vcg/complex/algorithms/update/texture.h       |  2 +-
 4 files changed, 85 insertions(+), 1 deletion(-)
 create mode 100644 apps/sample/trimesh_texture_clean/trimesh_texture_clean.cpp
 create mode 100644 apps/sample/trimesh_texture_clean/trimesh_texture_clean.pro

diff --git a/apps/sample/sample.pro b/apps/sample/sample.pro
index 10d6ff49..b1c10547 100644
--- a/apps/sample/sample.pro
+++ b/apps/sample/sample.pro
@@ -38,6 +38,7 @@ SUBDIRS       = trimesh_allocate \
                 trimesh_smooth \
                 trimesh_split_vertex \
                 trimesh_texture \
+                trimesh_texture_clean \
                 trimesh_topology \
                 trimesh_topological_cut \
                 trimesh_voronoi \
diff --git a/apps/sample/trimesh_texture_clean/trimesh_texture_clean.cpp b/apps/sample/trimesh_texture_clean/trimesh_texture_clean.cpp
new file mode 100644
index 00000000..e6e5029e
--- /dev/null
+++ b/apps/sample/trimesh_texture_clean/trimesh_texture_clean.cpp
@@ -0,0 +1,79 @@
+/****************************************************************************
+* VCGLib                                                            o o     *
+* Visual and Computer Graphics Library                            o     o   *
+*                                                                _   O  _   *
+* Copyright(C) 2004-2016                                           \/)\/    *
+* Visual Computing Lab                                            /\/|      *
+* ISTI - Italian National Research Council                           |      *
+*                                                                    \      *
+* All rights reserved.                                                      *
+*                                                                           *
+* This program is free software; you can redistribute it and/or modify      *
+* it under the terms of the GNU General Public License as published by      *
+* the Free Software Foundation; either version 2 of the License, or         *
+* (at your option) any later version.                                       *
+*                                                                           *
+* This program is distributed in the hope that it will be useful,           *
+* but WITHOUT ANY WARRANTY; without even the implied warranty of            *
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             *
+* GNU General Public License (http://www.gnu.org/licenses/gpl.txt)          *
+* for more details.                                                         *
+*                                                                           *
+****************************************************************************/
+#include<vcg/complex/complex.h>
+
+#include <wrap/io_trimesh/export_obj.h>
+#include <vcg/complex/algorithms/update/texture.h>
+#include <vcg/complex/algorithms/create/platonic.h>
+
+/*! \file trimesh_texture_clean.cpp
+\ingroup code_sample
+
+\brief a small example about removing fake texture seams eventually generated by rounding error in a texture param  
+
+*/
+
+using namespace vcg;
+
+class MyEdge;
+class MyFace;
+class MyVertex;
+struct MyUsedTypes : public UsedTypes<	Use<MyVertex>::AsVertexType, Use<MyFace>::AsFaceType>{};
+
+class MyVertex  : public Vertex< MyUsedTypes, vertex::Coord3f, vertex::VFAdj, vertex::Normal3f, vertex::BitFlags  >{};
+class MyFace    : public Face  < MyUsedTypes, face::VertexRef, face::VFAdj, face::WedgeTexCoord2f, face::Mark, face::BitFlags > {};
+class MyMesh    : public tri::TriMesh< std::vector<MyVertex>, std::vector<MyFace > >{};
+
+
+int main(int ,char ** )
+{
+  MyMesh m;
+  int mask = tri::io::Mask::IOM_WEDGTEXCOORD;
+  
+  // generate a simple 2D grid 
+  Grid(m,20,20,1,1);
+  // assign it a simple planar parametrization 
+  tri:UpdateTexture<MyMesh>::WedgeTexFromPlane(m,Point3f(1.0f,0,0),Point3f(0,1.0f,0),true);
+  tri::io::ExporterOBJ<MyMesh>::Save(m,"grid_0.obj",mask);
+  
+  // randomly perturb a few coord textures introducing fake seams
+  for(MyFace &f : m.face)
+  {
+    for(int i=0;i<3;++i)
+      if(rand()%20==0)
+      {
+        f.WT(i).U()+=0.0000001;
+        f.WT(i).V()-=0.0000001;
+      }
+  }
+  tri::io::ExporterOBJ<MyMesh>::Save(m,"grid_1.obj",mask);
+    
+  // Merge texture coords that very close
+  tri::UpdateTopology<MyMesh>::VertexFace(m);
+  tri::UpdateTexture<MyMesh>::WedgeTexMergeClose(m);
+  
+  tri::io::ExporterOBJ<MyMesh>::Save(m,"grid_2.obj",mask);
+    
+  return 0;
+}
+
diff --git a/apps/sample/trimesh_texture_clean/trimesh_texture_clean.pro b/apps/sample/trimesh_texture_clean/trimesh_texture_clean.pro
new file mode 100644
index 00000000..2c0f4f29
--- /dev/null
+++ b/apps/sample/trimesh_texture_clean/trimesh_texture_clean.pro
@@ -0,0 +1,4 @@
+include(../common.pri)
+TARGET = trimesh_texture_clean
+SOURCES += trimesh_texture_clean.cpp 
+
diff --git a/vcg/complex/algorithms/update/texture.h b/vcg/complex/algorithms/update/texture.h
index 5b380366..876d2875 100644
--- a/vcg/complex/algorithms/update/texture.h
+++ b/vcg/complex/algorithms/update/texture.h
@@ -71,7 +71,7 @@ static void WedgeTexFromPlane(ComputeMeshType &m, const Point3<ScalarType> &uVec
 
 	if (sideGutter>0.0)
 	{
-		ScalarType deltaGutter = std::min(wideU, wideV) * min(sideGutter, (ScalarType)0.5);
+		ScalarType deltaGutter = std::min(wideU, wideV) * std::min(sideGutter, (ScalarType)0.5);
 
 		bb.max[0] += deltaGutter;
 		bb.min[0] -= deltaGutter;