feat: refactor spawnpointcallback

particle-track-and-trace/src/QT/MainWindow.cpp

@@ -61,7 +61,7 @@ void MainWindow::setupTechniques() {
   // add date/time layer
   auto tm = new TimeLayer();
   technique1->addLayer(tm);
-  technique1->addLayer(tm);
+  technique2->addLayer(tm);
 
   // add Euler layers
   technique1->addLayer(new EColLayer(uvGrid));

particle-track-and-trace/src/QT/ui_mainwindow.h

@@ -225,7 +225,6 @@ public:
 
         verticalLayout_16->addWidget(IregularlySubsampledButton);
 
-
         verticalLayout_3->addWidget(ChannelBox);
 
 
@@ -244,6 +243,9 @@ public:
 
         MainWindow->setCentralWidget(centralWidget);
 
+        // FIXME: remove this line to enable subsampling buttons
+        GlyphBox_2->hide();
+
         retranslateUi(MainWindow);
 
         QMetaObject::connectSlotsByName(MainWindow);