Added experimental option to only mesh visible entities. (You can easily

shoot yourself in the foot with this: use with caution!)

Common/Context.h

@@ -164,7 +164,7 @@ class Context_T {
     int light, light_two_side, light_lines;
     int format, nb_smoothing, algo2d, algo3d, algo_recombine;
     int order, second_order_linear, second_order_incomplete;
-    int second_order_experimental;
+    int second_order_experimental, mesh_only_visible;
     int smooth_internal_edges, c1_continuity;
     int min_circ_points, min_curv_points;
     double normals, tangents, explode;

Common/DefaultOptions.h

@@ -982,6 +982,8 @@ StringXNumber MeshOptions_Number[] = {
   { F|O, "LineWidth" , opt_mesh_line_width , 1.0 , 
     "Display width of mesh lines (in pixels)" },
 
+  { F|O, "MeshOnlyVisible" , opt_mesh_mesh_only_visible, 0. ,
+    "Mesh only visible entities" },
   { F|O, "MetisAlgorithm" , opt_mesh_partition_metis_algorithm, 1. ,
     "METIS partitioning algorithm (1=Recursive, 2=K-way)" },
   { F|O, "MetisEdgeMatching" , opt_mesh_partition_metis_edge_matching, 3. ,

Common/Options.cpp

@@ -5104,6 +5104,13 @@ double opt_mesh_algo3d(OPT_ARGS_NUM)
   return CTX.mesh.algo3d;
 }
 
+double opt_mesh_mesh_only_visible(OPT_ARGS_NUM)
+{
+  if(action & GMSH_SET)
+    CTX.mesh.mesh_only_visible = (int)val;
+  return CTX.mesh.mesh_only_visible;
+}
+
 double opt_mesh_min_circ_points(OPT_ARGS_NUM)
 {
   if(action & GMSH_SET)

Common/Options.h

@@ -475,6 +475,7 @@ double opt_mesh_nb_smoothing(OPT_ARGS_NUM);
 double opt_mesh_algo2d(OPT_ARGS_NUM);
 double opt_mesh_algo3d(OPT_ARGS_NUM);
 double opt_mesh_recombine_algo(OPT_ARGS_NUM);
+double opt_mesh_mesh_only_visible(OPT_ARGS_NUM);
 double opt_mesh_min_circ_points(OPT_ARGS_NUM);
 double opt_mesh_allow_swap_edge_angle(OPT_ARGS_NUM);
 double opt_mesh_min_curv_points(OPT_ARGS_NUM);

Mesh/meshGEdge.cpp

@@ -271,6 +271,7 @@ void meshGEdge::operator() (GEdge *ge)
   if(ge->geomType() == GEntity::DiscreteCurve) return;
   if(ge->geomType() == GEntity::BoundaryLayerCurve) return;
   if(ge->meshAttributes.Method == MESH_NONE) return;
+  if(CTX.mesh.mesh_only_visible && !ge->getVisibility()) return;
 
   deMeshGEdge dem;
   dem(ge);

Mesh/meshGFace.cpp

@@ -1297,6 +1297,7 @@ void meshGFace::operator() (GFace *gf)
   if(gf->geomType() == GEntity::BoundaryLayerSurface) return;
   if(gf->geomType() == GEntity::ProjectionFace) return;
   if(gf->meshAttributes.Method == MESH_NONE) return;
+  if(CTX.mesh.mesh_only_visible && !gf->getVisibility()) return;
 
   // destroy the mesh if it exists
   deMeshGFace dem;

Mesh/meshGRegion.cpp

@@ -544,6 +544,7 @@ void meshGRegion::operator() (GRegion *gr)
 
   if(gr->geomType() == GEntity::DiscreteVolume) return;
   if(gr->meshAttributes.Method == MESH_NONE) return;
+  if(CTX.mesh.mesh_only_visible && !gr->getVisibility()) return;
 
   ExtrudeParams *ep = gr->meshAttributes.extrude;