diff --git a/include/openspace/abuffer/abuffer.h b/include/openspace/abuffer/abuffer.h
index 86de8676d7..6252ffc06c 100644
--- a/include/openspace/abuffer/abuffer.h
+++ b/include/openspace/abuffer/abuffer.h
@@ -55,7 +55,7 @@ public:
 
 	ABuffer();
 	virtual ~ABuffer();
-	virtual void resolve();
+	virtual void resolve(float blackoutFactor);
     virtual bool initialize() = 0;
 	virtual bool reinitialize();
 
diff --git a/include/openspace/abuffer/abufferframebuffer.h b/include/openspace/abuffer/abufferframebuffer.h
index f84e01cd2b..13b3f18f30 100644
--- a/include/openspace/abuffer/abufferframebuffer.h
+++ b/include/openspace/abuffer/abufferframebuffer.h
@@ -39,7 +39,7 @@ public:
     void clear();
     void preRender();
     void postRender();
-    void resolve();
+    void resolve(float blackoutFactor);
     
     std::vector<fragmentData> pixelData();
 protected:
diff --git a/shaders/ABuffer/abufferResolveFragment.glsl b/shaders/ABuffer/abufferResolveFragment.glsl
index d9e45834f9..dc6fedcb07 100644
--- a/shaders/ABuffer/abufferResolveFragment.glsl
+++ b/shaders/ABuffer/abufferResolveFragment.glsl
@@ -56,6 +56,8 @@ const float stepSize = 	0.01;
 const float samplingRate = 1.0;
 uniform float ALPHA_LIMIT = 0.99;
 
+uniform float blackoutFactor = 0.0;
+
 
 // Math defintions
 #define 	M_E   		2.7182818284590452354
@@ -307,7 +309,7 @@ void main() {
     out_color = vec4(texCoord,0.0,1.0);
     int frag_count = build_local_fragments_list();
     sort_fragments_list(frag_count);
-    out_color = calculate_final_color(frag_count);
+    out_color = blackoutFactor * calculate_final_color(frag_count);
 }
 
 // ================================================================================
diff --git a/src/abuffer/abuffer.cpp b/src/abuffer/abuffer.cpp
index 40944fcfd9..afadda50fa 100644
--- a/src/abuffer/abuffer.cpp
+++ b/src/abuffer/abuffer.cpp
@@ -55,20 +55,17 @@ namespace openspace {
 ABuffer::ABuffer()
 	: _validShader(false)
 	, _resolveShader(nullptr)
-	, _volumeStepFactor(0.0f)
+	, _volumeStepFactor(0.f)
 {
 
 	updateDimensions();
 }
 
 ABuffer::~ABuffer() {
-
-	if(_resolveShader)
-		delete _resolveShader;
+    delete _resolveShader;
 	
-	for(auto file: _samplerFiles) {
+	for (auto file: _samplerFiles)
 		delete file;
-	}
 }
 
 bool ABuffer::initializeABuffer() {
@@ -88,13 +85,14 @@ bool ABuffer::initializeABuffer() {
 	if (!_resolveShader)
 		return false;
 	_resolveShader->setProgramObjectCallback(shaderCallback);
+    // Remove explicit callback and use programobject isDirty instead ---abock
     
     // ============================
     // 		GEOMETRY (quad)
     // ============================
 	const GLfloat size = 1.0f;
-    const GLfloat vertex_data[] = { // square of two triangles (sigh)
-        //	  x      y     z     w     s     t
+    const GLfloat vertex_data[] = {
+        //	  x      y     s     t
         -size, -size, 0.0f, 1.0f,
         size,	size, 0.0f, 1.0f, 
         -size,  size, 0.0f, 1.0f, 
@@ -114,14 +112,13 @@ bool ABuffer::initializeABuffer() {
 }
 
 bool ABuffer::reinitialize() {
-
 	// set the total resolution for all viewports
 	updateDimensions();
 	return reinitializeInternal();
 }
 
-void ABuffer::resolve() {
-	if( ! _validShader) {
+void ABuffer::resolve(float blackoutFactor) {
+	if (!_validShader) {
 		generateShaderSource();
 		updateShader();
 		_validShader = true;
@@ -131,13 +128,14 @@ void ABuffer::resolve() {
 		return;
 
 	_resolveShader->activate();
+    _resolveShader->setUniform("blackoutFactor", blackoutFactor);
 	int startAt = 0;
-	for(int i = 0; i < _volumes.size(); ++i) {
+	for (int i = 0; i < _volumes.size(); ++i) {
 		glActiveTexture(GL_TEXTURE0 + i);
 		_volumes.at(i).second->bind();
 		startAt = i + 1;
 	}
-	for(int i = 0; i < _transferFunctions.size(); ++i) {
+	for (int i = 0; i < _transferFunctions.size(); ++i) {
 		glActiveTexture(GL_TEXTURE0 + startAt + i);
 		_transferFunctions.at(i).second->bind();
 	}
@@ -204,8 +202,7 @@ bool ABuffer::updateShader() {
 }
 
 void ABuffer::generateShaderSource() {
-
-	for(int i = 0; i < _samplerFiles.size(); ++i) {
+	for (int i = 0; i < _samplerFiles.size(); ++i) {
 		std::string line, source = "";
 		std::ifstream samplerFile(_samplerFiles.at(i)->path());
 		if(samplerFile.is_open()) {
@@ -225,7 +222,6 @@ void ABuffer::generateShaderSource() {
 }
 
 void ABuffer::openspaceHeaders() {
-
 	std::ofstream f(absPath(generatedHeadersPath));
 	f << "#define MAX_VOLUMES " << std::to_string(_samplers.size()) << "\n"
 		<< "#define MAX_TF " << _transferFunctions.size() << "\n";
diff --git a/src/abuffer/abufferframebuffer.cpp b/src/abuffer/abufferframebuffer.cpp
index 3dae2f4876..d8c8ca997c 100644
--- a/src/abuffer/abufferframebuffer.cpp
+++ b/src/abuffer/abufferframebuffer.cpp
@@ -60,6 +60,9 @@ void ABufferFramebuffer::preRender() {
 void ABufferFramebuffer::postRender() {
 
 }
+    
+void ABufferFramebuffer::resolve(float blackoutFactor) {
+}
 
 std::vector<ABuffer::fragmentData> ABufferFramebuffer::pixelData() {
     return std::vector<ABuffer::fragmentData>();
diff --git a/src/abuffer/abuffersinglelinked.cpp b/src/abuffer/abuffersinglelinked.cpp
index 89750f6ced..834f54ad07 100644
--- a/src/abuffer/abuffersinglelinked.cpp
+++ b/src/abuffer/abuffersinglelinked.cpp
@@ -56,11 +56,11 @@ ABufferSingleLinked::ABufferSingleLinked()
 {}
 
 ABufferSingleLinked::~ABufferSingleLinked() {
-	glDeleteTextures(1,&_anchorPointerTexture);
-	glDeleteTextures(1,&_fragmentTexture);
-	glDeleteBuffers(1,&_anchorPointerTextureInitializer);
-	glDeleteBuffers(1,&_atomicCounterBuffer);
-	glDeleteBuffers(1,&_anchorPointerTextureInitializer);
+	glDeleteTextures(1, &_anchorPointerTexture);
+	glDeleteTextures(1, &_fragmentTexture);
+	glDeleteBuffers(1, &_anchorPointerTextureInitializer);
+	glDeleteBuffers(1, &_atomicCounterBuffer);
+	glDeleteBuffers(1, &_anchorPointerTextureInitializer);
 }
 
 bool ABufferSingleLinked::initialize() {
@@ -123,7 +123,6 @@ void ABufferSingleLinked::clear() {
 }
 
 void ABufferSingleLinked::preRender() {
-
 	// Bind head-pointer image for read-write
 	glBindBufferBase(GL_ATOMIC_COUNTER_BUFFER, 0, _atomicCounterBuffer);
     glBindImageTexture(0, _anchorPointerTexture, 0, GL_FALSE, 0, GL_READ_WRITE, GL_R32UI);
@@ -135,7 +134,6 @@ void ABufferSingleLinked::postRender() {
 }
 
 std::vector<ABufferSingleLinked::fragmentData> ABufferSingleLinked::pixelData() {
-	
 	unsigned int* anchorTexture = new unsigned int[_totalPixels];
 	unsigned int* fragmentBuffer = new unsigned int[_totalPixels*MAX_LAYERS*4];
 
@@ -201,4 +199,4 @@ std::vector<ABufferSingleLinked::fragmentData> ABufferSingleLinked::pixelData()
 	return d;
 }
 
-} // openspace
\ No newline at end of file
+} // openspace
diff --git a/src/rendering/renderengine.cpp b/src/rendering/renderengine.cpp
index 1284f8ff91..111d5b95ff 100644
--- a/src/rendering/renderengine.cpp
+++ b/src/rendering/renderengine.cpp
@@ -389,7 +389,7 @@ void RenderEngine::render(const glm::mat4 &projectionMatrix, const glm::mat4 &vi
 
             glEnable(GL_BLEND);
             glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-            _abuffer->resolve();
+            _abuffer->resolve(_globalBlackOutFactor);
             glDisable(GL_BLEND);
         }
         else {