compile tutorial with namespace

Former-commit-id: 6643b9a67c

tutorial/703_Decimation/main.cpp

@@ -1,7 +1,7 @@
+#include <igl/circulation.h>
 #include <igl/collapse_edge.h>
 #include <igl/edge_flaps.h>
 #include <igl/read_triangle_mesh.h>
-#include <igl/circulation.h>
 #include <igl/Viewer/viewer.h>
 #include <Eigen/Core>
 #include <iostream>
@@ -25,7 +25,7 @@ int main(int argc, char * argv[])
   MatrixXi F,OF;
   read_triangle_mesh(filename,OV,OF);
 
-  igl::Viewer viewer;
+  igl::viewer::Viewer viewer;
 
   // Prepare array-based edge data structures and priority queue
   VectorXi EMAP;
@@ -79,7 +79,7 @@ int main(int argc, char * argv[])
     viewer.data.set_face_based(true);
   };
 
-  const auto &pre_draw = [&](igl::Viewer & viewer)->bool
+  const auto &pre_draw = [&](igl::viewer::Viewer & viewer)->bool
   {
     // If animating then collapse 10% of edges
     if(viewer.core.is_animating && !Q.empty())
@@ -108,7 +108,7 @@ int main(int argc, char * argv[])
   };
 
   const auto &key_down = 
-    [&](igl::Viewer &viewer,unsigned char key,int mod)->bool
+    [&](igl::viewer::Viewer &viewer,unsigned char key,int mod)->bool
   {
     switch(key)
     {