diff --git a/engine/src/core/com/jme3/renderer/Renderer.java b/engine/src/core/com/jme3/renderer/Renderer.java
index 8f25a823f..4ec4eaa7f 100644
--- a/engine/src/core/com/jme3/renderer/Renderer.java
+++ b/engine/src/core/com/jme3/renderer/Renderer.java
@@ -59,6 +59,12 @@ public interface Renderer {
      */
     public Statistics getStatistics();
 
+    /**
+     * Invalidates the current rendering state. Should be called after
+     * the GL state was changed manually or through an external library.
+     */
+    public void invalidateState();
+
     /**
      * Clears certain channels of the current bound framebuffer.
      *
diff --git a/engine/src/core/com/jme3/system/NullRenderer.java b/engine/src/core/com/jme3/system/NullRenderer.java
index 68672f858..8ebfa670f 100644
--- a/engine/src/core/com/jme3/system/NullRenderer.java
+++ b/engine/src/core/com/jme3/system/NullRenderer.java
@@ -62,6 +62,9 @@ public class NullRenderer implements Renderer {
         return stats;
     }
 
+    public void invalidateState(){
+    }
+
     public void clearBuffers(boolean color, boolean depth, boolean stencil) {
     }
 
diff --git a/engine/src/lwjgl-ogl/com/jme3/renderer/lwjgl/LwjglGL1Renderer.java b/engine/src/lwjgl-ogl/com/jme3/renderer/lwjgl/LwjglGL1Renderer.java
index c680847d3..7d8e80be6 100644
--- a/engine/src/lwjgl-ogl/com/jme3/renderer/lwjgl/LwjglGL1Renderer.java
+++ b/engine/src/lwjgl-ogl/com/jme3/renderer/lwjgl/LwjglGL1Renderer.java
@@ -101,6 +101,10 @@ public class LwjglGL1Renderer implements GL1Renderer {
         }
     }
 
+    public void invalidateState(){
+        context.reset();
+    }
+
     public void resetGLObjects() {
         colorSet = false;
 
diff --git a/engine/src/lwjgl-ogl/com/jme3/renderer/lwjgl/LwjglRenderer.java b/engine/src/lwjgl-ogl/com/jme3/renderer/lwjgl/LwjglRenderer.java
index 53509c11b..088a6e3fd 100644
--- a/engine/src/lwjgl-ogl/com/jme3/renderer/lwjgl/LwjglRenderer.java
+++ b/engine/src/lwjgl-ogl/com/jme3/renderer/lwjgl/LwjglRenderer.java
@@ -407,6 +407,12 @@ public class LwjglRenderer implements Renderer {
         logger.log(Level.INFO, "Caps: {0}", caps);
     }
 
+    public void invalidateState(){
+        context.reset();
+        boundShader = null;
+        lastFb = null;
+    }
+
     public void resetGLObjects() {
         objManager.resetObjects();
         statistics.clearMemory();