diff --git a/3d-viewer/3d_rendering/image.cpp b/3d-viewer/3d_rendering/image.cpp
index 6e6702de32..e6cbf603dc 100644
--- a/3d-viewer/3d_rendering/image.cpp
+++ b/3d-viewer/3d_rendering/image.cpp
@@ -524,6 +524,64 @@ void IMAGE::EfxFilter( IMAGE* aInImg, IMAGE_FILTER aFilterType )
 }
 
 
+void IMAGE::EfxFilter_SkipCenter( IMAGE* aInImg, IMAGE_FILTER aFilterType, unsigned int aRadius )
+{
+    if( ( !aInImg ) || ( m_width != aInImg->m_width ) || ( m_height != aInImg->m_height ) )
+        return;
+
+    S_FILTER filter = FILTERS[static_cast<int>( aFilterType )];
+
+    aInImg->m_wraping = IMAGE_WRAP::ZERO;
+
+    const unsigned int radiusSquared = aRadius * aRadius;
+
+    const unsigned int xCenter = m_width / 2;
+    const unsigned int yCenter = m_height / 2;
+
+    for( size_t iy = 0; iy < m_height; iy++ )
+    {
+        int yc = iy - yCenter;
+
+        yc = yc * yc;
+
+        for( size_t ix = 0; ix < m_width; ix++ )
+        {
+            int xc = ix - xCenter;
+
+            xc = xc * xc;
+
+            if( ( xc + yc ) < radiusSquared )
+            {
+                const unsigned int offset = ix + iy * m_width;
+
+                m_pixels[offset] = aInImg->m_pixels[offset];
+
+                continue;
+            }
+
+            int v = 0;
+
+            for( size_t sy = 0; sy < 5; sy++ )
+            {
+                for( size_t sx = 0; sx < 5; sx++ )
+                {
+                    int factor = filter.kernel[sx][sy];
+                    unsigned char pixelv = aInImg->Getpixel( ix + sx - 2, iy + sy - 2 );
+
+                    v += pixelv * factor;
+                }
+            }
+
+            v /= filter.div;
+            v += filter.offset;
+            CLAMP(v, 0, 255);
+
+            m_pixels[ix + iy * m_width] = v;
+        }
+    }
+}
+
+
 void IMAGE::SetPixelsFromNormalizedFloat( const float* aNormalizedFloatArray )
 {
     for( unsigned int i = 0; i < m_wxh; i++ )
diff --git a/3d-viewer/3d_rendering/image.h b/3d-viewer/3d_rendering/image.h
index 2757ec9b4d..79ae04b81f 100644
--- a/3d-viewer/3d_rendering/image.h
+++ b/3d-viewer/3d_rendering/image.h
@@ -175,6 +175,16 @@ public:
      */
     void EfxFilter( IMAGE* aInImg, IMAGE_FILTER aFilterType );
 
+    /**
+     * Apply a filter to the input image and store it in the image class.
+     * skip the circle center defined by radius
+     *
+     * @param aInImg input image
+     * @param aFilterType filter type to apply
+     * @param aRadius center circle that the effect will not be applied
+     */
+    void EfxFilter_SkipCenter( IMAGE* aInImg, IMAGE_FILTER aFilterType, unsigned int aRadius );
+
     /**
      * Save image buffer to a PNG file into the working folder.
      *
diff --git a/3d-viewer/3d_rendering/legacy/layer_triangles.cpp b/3d-viewer/3d_rendering/legacy/layer_triangles.cpp
index af95f2f2c3..42ea3a9711 100644
--- a/3d-viewer/3d_rendering/legacy/layer_triangles.cpp
+++ b/3d-viewer/3d_rendering/legacy/layer_triangles.cpp
@@ -650,7 +650,7 @@ GLuint OPENGL_RENDER_LIST::generate_top_or_bot_seg_ends(
 
             setBlendfunction();
 
-            glAlphaFunc( GL_GREATER, 0.2f );
+            glAlphaFunc( GL_GREATER, 0.98f );
             glEnable( GL_ALPHA_TEST );
 
             glNormal3f( 0.0f, 0.0f, aIsNormalUp?1.0f:-1.0f );
diff --git a/3d-viewer/3d_rendering/legacy/render_3d_legacy.cpp b/3d-viewer/3d_rendering/legacy/render_3d_legacy.cpp
index d745dc557a..2799d79ede 100644
--- a/3d-viewer/3d_rendering/legacy/render_3d_legacy.cpp
+++ b/3d-viewer/3d_rendering/legacy/render_3d_legacy.cpp
@@ -982,19 +982,25 @@ bool RENDER_3D_LEGACY::initializeOpenGL()
     if( !circleImage )
         return false;
 
+    unsigned int circleRadius = ( SIZE_OF_CIRCLE_TEXTURE / 2 ) - 0;
+
     circleImage->CircleFilled( ( SIZE_OF_CIRCLE_TEXTURE / 2 ) - 0,
                                ( SIZE_OF_CIRCLE_TEXTURE / 2 ) - 0,
-                               ( SIZE_OF_CIRCLE_TEXTURE / 2 ) - 4,
+                               circleRadius,
                                0xFF );
 
-    IMAGE* circleImage_Copy = new IMAGE( *circleImage );
+    IMAGE* circleImageBlured = new IMAGE( circleImage->GetWidth(), circleImage->GetHeight() );
 
-    circleImage->EfxFilter( circleImage_Copy, IMAGE_FILTER::BLUR_3X3 );
+    circleImageBlured->EfxFilter_SkipCenter( circleImage, IMAGE_FILTER::GAUSSIAN_BLUR, circleRadius - 8 );
 
-    m_circleTexture = OglLoadTexture( *circleImage );
+    circleImage->EfxFilter_SkipCenter( circleImageBlured, IMAGE_FILTER::GAUSSIAN_BLUR, circleRadius - 8 );
 
-    delete circleImage_Copy;
-    circleImage_Copy = 0;
+    circleImageBlured->EfxFilter_SkipCenter( circleImage, IMAGE_FILTER::GAUSSIAN_BLUR, circleRadius - 8 );
+
+    m_circleTexture = OglLoadTexture( *circleImageBlured );
+
+    delete circleImageBlured;
+    circleImageBlured = 0;
 
     delete circleImage;
     circleImage = 0;