added a picking test function in main.cc

glow-extras @ 6f9c9a2f

-Subproject commit 76bc3b2141fba84b981545b58fc54dc20e5da02d
+Subproject commit 6f9c9a2fe8be60af499d326633e5ae73a72a1534

samples/basic/viewer/main.cc

@@ -22,14 +22,13 @@ std::string const dataPath = glow::util::pathOf(__FILE__) + "/../../../data/";
 
 void picking_concept(pm::vertex_attribute<tg::pos3> const& pos)
 {
-    /*Picking concept that will be implemented first: User gives a list of ids (std::vector<uint_32t>) that will be stored in Picker. Number od ids has to match the
-	number of faces in the mesh. At first: Only implement for Triangle_Meshes!*/
+    /*Picking concept that will be implemented first: User gives a list of ids (std::vector<uint_32t>) that will be stored in Picker. Number od ids
+       has to match the number of faces in the mesh. At first: Only implement for Triangle_Meshes!*/
     std::vector<uint32_t> col_ids = {1, 2};
 
     gv::view(pos, gv::Picker::pick(col_ids, [&](pm::face_index f, tg::pos3 world_pos, tg::dir3 normal) { std::cout << "face: " << std::endl; }));
 
 
-
     /*gv::view(pos, gv::pick()
                           .on_hover([&](pm::face_index f, tg::pos3 world_pos, tg::dir3 normal){
                              // std::cout << "face: " << f.idx << std::endl;
@@ -73,6 +72,15 @@ void picking_concept(pm::vertex_attribute<tg::pos3> const& pos)
     }
 }
 
+void simple_picking(pm::vertex_attribute<tg::pos3> const& pos, pm::face_attribute<tg::color3> const& col)
+{
+    // simple picking functionality, user-defined ids for primitives (i.e. triangles) + user-defined callback-function
+
+    std::vector<uint32_t> col_ids = {1, 2};
+    gv::view(pos, col, gv::Picker::pick(col_ids, [&](uint32_t face_id, tg::pos3 world_pos, tg::dir3 normal) {
+                 std::cout << "Something has been picked!" << std::endl;
+             }));
+}
 
 void simple_view(pm::vertex_attribute<tg::pos3> const& pos)
 {
@@ -1043,12 +1051,21 @@ int main()
     pos[t2_vh1] = tg::pos3(20, 0, 0);
     pos[t2_vh2] = tg::pos3(20, 20, 0);
 
-    m.faces().add(t1_vh0, t1_vh1, t1_vh2);
-    m.faces().add(t2_vh0, t2_vh1, t2_vh2);
+    auto col = pm::face_attribute<tg::color3>(m);
+    const auto f1 = m.faces().add(t1_vh0, t1_vh1, t1_vh2);
+    const auto f2 = m.faces().add(t2_vh0, t2_vh1, t2_vh2);
+
+    col[f1] = tg::color3::blue;
+    col[f2] = tg::color3::cyan;
 
     // deduplicate(m, pos);
     // m.compactify();
 
+	// simple picking demo
+	{
+        simple_picking(pos, col);
+	}
+
     // basic demos
     {
         simple_view(pos);