diff --git a/common-tools/clas-jcsg/pom.xml b/common-tools/clas-jcsg/pom.xml
index 03531bcc43..a39038a017 100644
--- a/common-tools/clas-jcsg/pom.xml
+++ b/common-tools/clas-jcsg/pom.xml
@@ -48,10 +48,6 @@
       <groupId>java3d</groupId>
       <artifactId>vecmath</artifactId>
     </dependency>
-    <dependency>
-      <groupId>org.slf4j</groupId>
-      <artifactId>slf4j-api</artifactId>
-    </dependency>
   </dependencies>
 
 </project>
diff --git a/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/DTSweep.java b/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/DTSweep.java
index 3ce4de8cbd..7147633bfe 100644
--- a/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/DTSweep.java
+++ b/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/DTSweep.java
@@ -66,14 +66,9 @@
 import static eu.mihosoft.vrl.v3d.ext.org.poly2tri.TriangulationUtil.smartIncircle;
 
 import java.util.List;
+import java.util.logging.Logger;
 
-import eu.mihosoft.vrl.v3d.ext.org.poly2tri.TriangulationMode;
-import eu.mihosoft.vrl.v3d.ext.org.poly2tri.TriangulationPoint;
 import eu.mihosoft.vrl.v3d.ext.org.poly2tri.TriangulationUtil.Orientation;
-import eu.mihosoft.vrl.v3d.ext.org.poly2tri.DelaunayTriangle;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 /**
  * Sweep-line, Constrained Delauney Triangulation (CDT) See: Domiter, V. and
@@ -86,7 +81,7 @@
  */
 class DTSweep {
 
-    private final static Logger logger = LoggerFactory.getLogger(DTSweep.class);
+    private final static Logger logger = Logger.getLogger(DTSweep.class.getName());
 
     private final static double PI_div2 = Math.PI / 2;
     private final static double PI_3div4 = 3 * Math.PI / 4;
@@ -359,7 +354,7 @@ private static void edgeEvent(DTSweepContext tcx,
 
             edgeEvent(tcx, edge.p, edge.q, node.triangle, edge.q);
         } catch (PointOnEdgeException e) {
-            logger.warn("Skipping edge: {}", e.getMessage());
+            logger.warning(() -> "Skipping edge: "+e.getMessage());
         }
     }
 
diff --git a/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/DTSweepConstraint.java b/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/DTSweepConstraint.java
index 1ab4de02f7..e75360fb7d 100644
--- a/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/DTSweepConstraint.java
+++ b/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/DTSweepConstraint.java
@@ -60,8 +60,7 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import java.util.logging.Logger;
 
 /**
  * 
@@ -70,7 +69,7 @@
  */
 class DTSweepConstraint extends TriangulationConstraint
 {
-    private final static Logger logger = LoggerFactory.getLogger( DTSweepConstraint.class );
+    private final static Logger logger = Logger.getLogger( DTSweepConstraint.class.getName() );
 
     public TriangulationPoint p;
     public TriangulationPoint q;
@@ -101,7 +100,7 @@ else if( p1.getY() == p2.getY() )
             }
             else if( p1.getX() == p2.getX() )
             {
-                logger.info( "Failed to create constraint {}={}", p1, p2 );
+                logger.info(() -> "Failed to create constraint "+p1+"="+p2);
 //                throw new DuplicatePointException( p1 + "=" + p2 );
 //                return;
             }
diff --git a/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/DTSweepContext.java b/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/DTSweepContext.java
index 3482f11bf3..aa369e2844 100644
--- a/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/DTSweepContext.java
+++ b/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/DTSweepContext.java
@@ -60,20 +60,16 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-
 import java.util.ArrayDeque;
 import java.util.Collections;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-
+import java.util.logging.Logger;
 
 /**
  * @author Thomas ??? (thahlen@gmail.com)
  */
 class DTSweepContext extends TriangulationContext<DTSweepDebugContext>
 {
-    private final static Logger logger = LoggerFactory.getLogger( DTSweepContext.class );
+    private final static Logger logger = Logger.getLogger( DTSweepContext.class.getName() );
 
     // Inital triangle factor, seed triangle will extend 30% of 
     // PointSet width to both left and right.
diff --git a/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/DelaunayTriangle.java b/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/DelaunayTriangle.java
index 3a8f7cf652..f125574402 100644
--- a/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/DelaunayTriangle.java
+++ b/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/DelaunayTriangle.java
@@ -60,14 +60,11 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 import java.util.ArrayList;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
+import java.util.logging.Logger;
 
 class DelaunayTriangle
 {
-    private final static Logger logger    = LoggerFactory.getLogger( DelaunayTriangle.class );
+    private final static Logger logger  = Logger.getLogger( DelaunayTriangle.class.getName() );
 
     /** Neighbor pointers */
     public final DelaunayTriangle[]   neighbors = new DelaunayTriangle[3];
@@ -160,7 +157,7 @@ else if( ( p1 == points[0] && p2 == points[1] ) || ( p1 == points[1] && p2 == po
         }
         else
         {
-            logger.error( "Neighbor error, please report!" );
+            logger.severe( "Neighbor error, please report!" );
             // throw new Exception("Neighbor error, please report!");
         }
     }
@@ -185,7 +182,7 @@ else if( t.contains( points[0], points[1] ) )
         }
         else
         {
-            logger.error( "markNeighbor failed" );
+            logger.severe( "markNeighbor failed" );
         }
     }
 
@@ -295,7 +292,7 @@ else if( point == points[2] )
         {
             return points[0];
         }
-        logger.error( "point location error" );
+        logger.severe( "point location error" );
         throw new RuntimeException("[FIXME] point location error");
     }
 
@@ -314,7 +311,7 @@ else if( point == points[2] )
         {
             return points[1];
         }
-        logger.error( "point location error" );
+        logger.severe( "point location error" );
         throw new RuntimeException("[FIXME] point location error");
     }
 
@@ -341,7 +338,7 @@ else if( oPoint == points[2] )
         }
         else
         {
-            logger.error( "legalization error" );
+            logger.severe( "legalization error" );
             throw new RuntimeException("legalization bug");
         }
     }
diff --git a/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/Poly2Tri.java b/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/Poly2Tri.java
index f0dcf87376..6b208a48a9 100644
--- a/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/Poly2Tri.java
+++ b/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/Poly2Tri.java
@@ -60,13 +60,11 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import java.util.logging.Logger;
 
 class Poly2Tri
 {
-    private final static Logger logger = LoggerFactory.getLogger( Poly2Tri.class );
+    private final static Logger logger = Logger.getLogger( Poly2Tri.class.getName() );
 
     private static final TriangulationAlgorithm _defaultAlgorithm = TriangulationAlgorithm.DTSweep;
     
diff --git a/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/Polygon.java b/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/Polygon.java
index 484e9b46d3..814325572e 100644
--- a/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/Polygon.java
+++ b/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/Polygon.java
@@ -63,13 +63,11 @@
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import java.util.logging.Logger;
 
 class Polygon implements Triangulatable
 {
-    private final static Logger logger = LoggerFactory.getLogger( Polygon.class );
+    private final static Logger logger = Logger.getLogger( Polygon.class.getName() );
 
     protected ArrayList<TriangulationPoint> _points = new ArrayList<TriangulationPoint>();
     protected ArrayList<TriangulationPoint> _steinerPoints;
@@ -110,7 +108,7 @@ public Polygon( List<PolygonPoint> points )
         // Its something that often happen when importing polygon data from other formats
         if( points.get(0).equals( points.get(points.size()-1) ) )
         {
-            logger.warn( "Removed duplicate point");
+            logger.warning( "Removed duplicate point");
             points.remove( points.size()-1 );
         }
         _points.addAll( points );
diff --git a/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/TriangulationProcess.java b/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/TriangulationProcess.java
index 28f4529f76..f6ab12dc38 100644
--- a/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/TriangulationProcess.java
+++ b/common-tools/clas-jcsg/src/main/java/eu/mihosoft/vrl/v3d/ext/org/poly2tri/TriangulationProcess.java
@@ -62,11 +62,7 @@
 import java.lang.Thread.State;
 import java.util.ArrayList;
 import java.util.List;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-
-
+import java.util.logging.Logger;
 
 /**
  * 
@@ -75,7 +71,7 @@
  */
 class TriangulationProcess implements Runnable
 {
-    private final static Logger logger = LoggerFactory.getLogger( TriangulationProcess.class );
+    private final static Logger logger = Logger.getLogger(TriangulationProcess.class.getName());
 
     private final TriangulationAlgorithm _algorithm;
     
@@ -261,7 +257,7 @@ public void run()
                 Poly2Tri.triangulate( _tcx );
             }
             _triangulationTime = ( System.nanoTime() - time ) / 1e6;
-            logger.info( "Triangulation of {} points [{}ms]", _pointCount, _triangulationTime );
+            logger.info(() -> "Triangulation of "+_pointCount+" points ["+_triangulationTime+"ms]");
             sendEvent( TriangulationProcessEvent.Done );
         }
         catch( RuntimeException e )
@@ -269,7 +265,7 @@ public void run()
             if( _awaitingTermination )
             {
                 _awaitingTermination = false;
-                logger.info( "Thread[{}] : {}", _thread.getName(), e.getMessage() );
+                logger.info(() -> "Thread["+_thread.getName()+")] : "+e.getMessage() );
                 sendEvent( TriangulationProcessEvent.Aborted );
             }
             else
@@ -281,7 +277,7 @@ public void run()
         catch( Exception e )
         {
             e.printStackTrace();
-            logger.info( "Triangulation exception {}", e.getMessage() );
+            logger.info(() -> "Triangulation exception "+e.getMessage());
             sendEvent( TriangulationProcessEvent.Failed );
         }
         finally