# Debug Visual {#debugvisual} ## Enable debug rendering Setting DALI_DEBUG_RENDERING environment variable will enable the visual debuging. Then, every concrete visual ( ColorVisual, BorderVisual, ImageVisual, GradientVisual, etc. ) is replaced with a DebugVisual object. Debug visual renders a simple quad wireframe, so that the control layout and scene structure is clearly displayed. ### Example: ~~~{.bash} sh-4.1$ DALI_DEBUG_RENDERING=1 /usr/apps/com.samsung.dali-demo/bin/blocks.example ~~~