/usr/include/gazebo-9/gazebo/rendering/ is in libgazebo9-dev 9.0.0+dfsg5-3ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gazebo-9/gazebo/rendering/ApplyWrenchVisual.hh
/usr/include/gazebo-9/gazebo/rendering/ArrowVisual.hh
/usr/include/gazebo-9/gazebo/rendering/AxisVisual.hh
/usr/include/gazebo-9/gazebo/rendering/COMVisual.hh
/usr/include/gazebo-9/gazebo/rendering/Camera.hh
/usr/include/gazebo-9/gazebo/rendering/CameraVisual.hh
/usr/include/gazebo-9/gazebo/rendering/ContactVisual.hh
/usr/include/gazebo-9/gazebo/rendering/Conversions.hh
/usr/include/gazebo-9/gazebo/rendering/CustomPSSMShadowCameraSetup.hh
/usr/include/gazebo-9/gazebo/rendering/DepthCamera.hh
/usr/include/gazebo-9/gazebo/rendering/Distortion.hh
/usr/include/gazebo-9/gazebo/rendering/DynamicLines.hh
/usr/include/gazebo-9/gazebo/rendering/DynamicRenderable.hh
/usr/include/gazebo-9/gazebo/rendering/FPSViewController.hh
/usr/include/gazebo-9/gazebo/rendering/GpuLaser.hh
/usr/include/gazebo-9/gazebo/rendering/GpuLaserDataIterator.hh
/usr/include/gazebo-9/gazebo/rendering/GpuLaserDataIteratorImpl.hh
/usr/include/gazebo-9/gazebo/rendering/Grid.hh
/usr/include/gazebo-9/gazebo/rendering/Heightmap.hh
/usr/include/gazebo-9/gazebo/rendering/InertiaVisual.hh
/usr/include/gazebo-9/gazebo/rendering/JointVisual.hh
/usr/include/gazebo-9/gazebo/rendering/LaserVisual.hh
/usr/include/gazebo-9/gazebo/rendering/LensFlare.hh
/usr/include/gazebo-9/gazebo/rendering/Light.hh
/usr/include/gazebo-9/gazebo/rendering/LinkFrameVisual.hh
/usr/include/gazebo-9/gazebo/rendering/LogicalCameraVisual.hh
/usr/include/gazebo-9/gazebo/rendering/Material.hh
/usr/include/gazebo-9/gazebo/rendering/MovableText.hh
/usr/include/gazebo-9/gazebo/rendering/OrbitViewController.hh
/usr/include/gazebo-9/gazebo/rendering/OriginVisual.hh
/usr/include/gazebo-9/gazebo/rendering/OrthoViewController.hh
/usr/include/gazebo-9/gazebo/rendering/Projector.hh
/usr/include/gazebo-9/gazebo/rendering/RFIDTagVisual.hh
/usr/include/gazebo-9/gazebo/rendering/RFIDVisual.hh
/usr/include/gazebo-9/gazebo/rendering/RTShaderSystem.hh
/usr/include/gazebo-9/gazebo/rendering/RayQuery.hh
/usr/include/gazebo-9/gazebo/rendering/RenderEngine.hh
/usr/include/gazebo-9/gazebo/rendering/RenderEvents.hh
/usr/include/gazebo-9/gazebo/rendering/RenderTypes.hh
/usr/include/gazebo-9/gazebo/rendering/RenderingIface.hh
/usr/include/gazebo-9/gazebo/rendering/Road2d.hh
/usr/include/gazebo-9/gazebo/rendering/Scene.hh
/usr/include/gazebo-9/gazebo/rendering/SelectionObj.hh
/usr/include/gazebo-9/gazebo/rendering/SonarVisual.hh
/usr/include/gazebo-9/gazebo/rendering/TransmitterVisual.hh
/usr/include/gazebo-9/gazebo/rendering/UserCamera.hh
/usr/include/gazebo-9/gazebo/rendering/VideoVisual.hh
/usr/include/gazebo-9/gazebo/rendering/ViewController.hh
/usr/include/gazebo-9/gazebo/rendering/Visual.hh
/usr/include/gazebo-9/gazebo/rendering/WideAngleCamera.hh
/usr/include/gazebo-9/gazebo/rendering/WindowManager.hh
/usr/include/gazebo-9/gazebo/rendering/WireBox.hh
/usr/include/gazebo-9/gazebo/rendering/WrenchVisual.hh
/usr/include/gazebo-9/gazebo/rendering/ogre_gazebo.h
/usr/include/gazebo-9/gazebo/rendering/rendering.hh