more subtle cases

samples/basic/viewer/main.cc

@@ -509,8 +509,12 @@ void special_use_cases(pm::vertex_attribute<tg::pos3> const& pos)
 
 void subtle_cases(pm::vertex_attribute<tg::pos3> const& pos)
 {
-    // doubles are converted to floats
-    gv::view(gv::points(pos).point_size_world(0.01));
+    // pos3-like includes doubles and integer
+    gv::view(pos.to<tg::dpos3>(), "double positions");
+    gv::view(pos.to<tg::ipos3>(), "integer positions");
+
+    // doubles scalar attributes are converted to floats
+    gv::view(gv::points(pos).point_size_world(0.01), "double uniform attributes");
 }
 
 int main()