diff --git a/source/MRCommonPlugins/ViewerButtons/MRViewerSettingsPlugin.cpp b/source/MRCommonPlugins/ViewerButtons/MRViewerSettingsPlugin.cpp
index 36b2f1c61efb..bb12c3b93d1a 100644
--- a/source/MRCommonPlugins/ViewerButtons/MRViewerSettingsPlugin.cpp
+++ b/source/MRCommonPlugins/ViewerButtons/MRViewerSettingsPlugin.cpp
@@ -176,9 +176,13 @@ void ViewerSettingsPlugin::drawDialog( float menuScaling, ImGuiContext* )
             }
             ImGui::ColorEdit4( "Color", &shadowGl_->shadowColor.x,
                 ImGuiColorEditFlags_NoInputs | ImGuiColorEditFlags_PickerHueWheel );
-            ImGui::DragFloat2( "Shift", &shadowGl_->shadowShift.x, 0.4f, -200.0f, 200.0f );
-            ImGui::SetTooltipIfHovered( "X, Y shift in screen coordinates:\nX going right\nY going up", menuScaling );
-            ImGui::DragFloatValid( "Blur radius", &shadowGl_->blurRadius, 0.2f, 0, 200 );
+            
+            const char* tooltipsShift[2] = {
+                "Shift along Ox-axis to the left",
+                "Shift along Oy-axis to the top"
+            };
+            ImGui::DragFloatValid2( "Shift", &shadowGl_->shadowShift.x, 0.4f, -200.0f, 200.0f, "%.3f px", 0, &tooltipsShift );
+            ImGui::DragFloatValid( "Blur radius", &shadowGl_->blurRadius, 0.2f, 0, 200, "%.3f px" );
             float quality = shadowGl_->getQuality();
             ImGui::DragFloatValid( "Quality", &quality, 0.001f, 0.0625f, 1.0f );
             ImGui::SetTooltipIfHovered( "Blur texture downscaling coefficient", menuScaling );
diff --git a/source/MRViewer/ImGuiHelpers.cpp b/source/MRViewer/ImGuiHelpers.cpp
index da3c8fab791c..46e1cfca8294 100644
--- a/source/MRViewer/ImGuiHelpers.cpp
+++ b/source/MRViewer/ImGuiHelpers.cpp
@@ -307,6 +307,44 @@ bool InputIntValid( const char* label, int* v, int v_min, int v_max,
     return res;
 }
 
+MultiDragRes DragFloatValid2( const char* label, float* valueArr, float step, float valueMin, float valueMax, const char* format, ImGuiSliderFlags flags, const char* ( *tooltips )[2] )
+{
+    MultiDragRes res;
+
+    ImGuiContext& g = *ImGui::GetCurrentContext();
+    ImGuiWindow* window = g.CurrentWindow;
+    if ( window->SkipItems )
+        return res;
+
+    BeginGroup();
+    PushID( label );
+    constexpr int components = 2;
+    PushMultiItemsWidths( components, CalcItemWidth() );
+    for ( int i = 0; i < components; i++ )
+    {
+        PushID( i );
+        if ( i > 0 )
+            SameLine( 0, g.Style.ItemInnerSpacing.x );
+        res.valueChanged = DragFloatValid( "", valueArr + i, step, valueMin, valueMax, format, flags ) || res.valueChanged;
+        if ( tooltips && IsItemHovered() && !IsItemActive() )
+            SetTooltip( "%s", ( *tooltips )[i] );
+        res.itemDeactivatedAfterEdit = res.itemDeactivatedAfterEdit || IsItemDeactivatedAfterEdit();
+        PopID();
+        PopItemWidth();
+    }
+    PopID();
+
+    const char* label_end = FindRenderedTextEnd( label );
+    if ( label != label_end )
+    {
+        SameLine( 0, g.Style.ItemInnerSpacing.x );
+        TextEx( label, label_end );
+    }
+
+    EndGroup();
+    return res;
+}
+
 MultiDragRes DragFloatValid3( const char * label, float* valueArr, float step, float valueMin, float valueMax, const char* format, ImGuiSliderFlags flags, const char* (*tooltips)[3] )
 {
     MultiDragRes res;
diff --git a/source/MRViewer/ImGuiHelpers.h b/source/MRViewer/ImGuiHelpers.h
index 0f52af536a89..7f8ff3da64d1 100644
--- a/source/MRViewer/ImGuiHelpers.h
+++ b/source/MRViewer/ImGuiHelpers.h
@@ -100,6 +100,16 @@ struct MultiDragRes
     explicit operator bool() const { return valueChanged; }
 };
 
+/// similar to ImGui::DragFloat2 - two drag-float controls in a row, but
+/// 1) returns information whether an item was deactivated;
+/// 2) calls DragFloatValid inside instead of DragFloat;
+/// 3) permits showing tooltip for each item
+MRVIEWER_API MultiDragRes DragFloatValid2( const char* label, float v[2], float v_speed = 1.0f,
+    float min = std::numeric_limits<float>::lowest(),
+    float max = std::numeric_limits<float>::max(),
+    const char* format = "%.3f", ImGuiSliderFlags flags = 0,
+    const char* ( *tooltips )[2] = nullptr );
+
 /// similar to ImGui::DragFloat3 - three drag-float controls in a row, but
 /// 1) returns information whether an item was deactivated;
 /// 2) calls DragFloatValid inside instead of DragFloat;
diff --git a/source/MRViewer/MRGLStaticHolder.cpp b/source/MRViewer/MRGLStaticHolder.cpp
index 53b6efed17a9..df58f907ffb7 100644
--- a/source/MRViewer/MRGLStaticHolder.cpp
+++ b/source/MRViewer/MRGLStaticHolder.cpp
@@ -1247,7 +1247,13 @@ void main(void)
   out vec4 outColor;                 // (out to render) fragment color
 
   const float gaussWeights[] = float[7] (0.161046, 0.148645, 0.116919, 0.078381, 0.044771, 0.021742, 0.009019);
-
+  
+  float getValue( vec2 pos )
+  {
+    if ( pos.x < 0.0 || pos.x > 1.0 || pos.y < 0.0 || pos.y > 1.0 )
+      return 0.0;    
+    return texture(pixels,pos).a;
+  }
   void main()
   { 
     gl_FragDepth = 0.9999;
@@ -1262,12 +1268,12 @@ void main(void)
     else
       posShift = vec2(0.0,blurRadius /(6.0* float(texSize.y)));
     
-    float convSum = gaussWeights[0]*texture(pixels, pos).a;
+    float convSum = gaussWeights[0]*getValue(pos);
     for ( int i=1; i<=6; ++i )
     {
       vec2 fullShift = float(i)*posShift;
-      convSum = convSum + gaussWeights[i]*texture(pixels, pos+fullShift).a;
-      convSum = convSum + gaussWeights[i]*texture(pixels, pos-fullShift).a;
+      convSum = convSum + gaussWeights[i]*getValue(pos+fullShift);
+      convSum = convSum + gaussWeights[i]*getValue(pos-fullShift);
     }
     outColor = vec4(color.rgb,convSum);
     if ( !convX )