message: clearing frame buffer on model change.
diff: @@ -134,6 +134,9 @@ void GLFWOSPRayWindow::setModel(OSPModel newModel)
  // commit the renderer
  ospCommit(renderer);
  +
  + // clear frame buffer
  + ospFrameBufferClear(framebuffer, OSP_FB_COLOR | OSP_FB_ACCUM);
  }
  void GLFWOSPRayWindow::registerDisplayCallback(
  @@ -230,6 +233,7 @@ void GLFWOSPRayWindow::motion(const ospcommon::vec2f &position)
  ospCommit(camera);
  }
  }
  +
  previousMouse = mouse;
  }
  