killall gzserver
sudo pkill gzserver
killall -9 gzserver
pkill gazebo
killall -9 gazebo
gazebo --verbose 

• custom_world.launch
• test.launch
• world_with_robot.launch

copying images of room to docker container

run in normal terminal

docker cp /path/to/local/file/or/directory <container_id_or_name>:/path/in/container

docker cp /home/ibrahim/Pictures/Screenshots/room3.png c270cb17f702:/root/catkin_ws/src/my_robot_control/images

docker cp c270cb17f702:/root/catkin_ws /home/ibrahim/

• added this to first_world.world file for laying textures on objects
• adding colors to the object useing ambient tag:
• second_world.world file: