Feature/volume rendering (#110)

* Add initial version of volume rendering

* Add toggle for volume rendering

* Turn on front face culling when volume rendering

* Add initial window/level control for transfer function

* Fix issue with initializing window level start position, use wireframe when volume rendering

* Use otsu method to set initial volume rendering window level

* Use raycast volume mapper

* Add surface render mode, using front face culling with no lighting for volume rendering

* Adjust maximum opacity

* Use extract voi for current region when volume rendering

* Mask volume by visible region extents

* Show full volume if no current region

* Set current region in pop temp history

CMakeLists.txt

@@ -67,8 +67,8 @@ set(UI_RESOURCES
 # Create executable
 qt5_wrap_ui(UISrcs ${UI_FILES} )
 # CMAKE_AUTOMOC is ON so the MOC headers will be automatically wrapped.
-add_executable(Segmentor MACOSX_BUNDLE WIN32 ${CXX_FILES} ${UISrcs} ${QT_WRAP} ${UI_RESOURCES})
-#add_executable(Segmentor MACOSX_BUNDLE ${CXX_FILES} ${UISrcs} ${QT_WRAP} ${UI_RESOURCES})
+#add_executable(Segmentor MACOSX_BUNDLE WIN32 ${CXX_FILES} ${UISrcs} ${QT_WRAP} ${UI_RESOURCES})
+add_executable(Segmentor MACOSX_BUNDLE ${CXX_FILES} ${UISrcs} ${QT_WRAP} ${UI_RESOURCES})
 qt5_use_modules(Segmentor Core Gui)
 target_link_libraries(Segmentor ${VTK_LIBRARIES})
 install(TARGETS Segmentor 

Segmentor.qrc

@@ -25,5 +25,6 @@
   <file>icons/icon_show_neighbor_regions.png</file>
   <file>icons/icon_filter_regions.png</file>
   <file>icons/icon_reset_view.png</file>
+  <file>icons/icon_volume_render.png</file>
 </qresource>
 </RCC>

interaction/InteractionCallbacks.cxx

@@ -13,6 +13,7 @@
 #include "VolumeView.h"
 #include "SliceView.h"
 #include "vtkInteractorStyleSlice.h"
+#include "vtkInteractorStyleVolume.h"
 
 bool InteractionCallbacks::firstCameraCallback = true;
 
@@ -293,4 +294,11 @@ void InteractionCallbacks::WindowLevel(vtkObject* caller, unsigned long eventId,
 	VisualizationContainer* vis = static_cast<VisualizationContainer*>(clientData);
 
 	vis->SetWindowLevel(style->GetWindow(), style->GetLevel());
+}
+
+void InteractionCallbacks::VolumeWindowLevel(vtkObject* caller, unsigned long eventId, void* clientData, void *callData) {
+	vtkInteractorStyleVolume* style = static_cast<vtkInteractorStyleVolume*>(caller);
+	VisualizationContainer* vis = static_cast<VisualizationContainer*>(clientData);
+
+	vis->SetVolumeWindowLevel(style->GetWindow(), style->GetLevel());
 }

interaction/InteractionCallbacks.h

@@ -34,6 +34,7 @@ class InteractionCallbacks {
 	static void MouseMove(vtkObject* caller, unsigned long eventId, void* clientData, void *callData);
 
 	static void WindowLevel(vtkObject* caller, unsigned long eventId, void* clientData, void *callData);
+	static void VolumeWindowLevel(vtkObject* caller, unsigned long eventId, void* clientData, void *callData);
 
 private:
 	static bool firstCameraCallback;