Implementation of Depth Image

[Inoriros]

Thank you very much for your impressive work; it's a great contribution to the community. I have a question about integrating the depth image: The depth image topic is visible and referenced in sim_image_repub.cpp, but there's no image data when I check the topic. Should adjustments be made to the Unity model? I'm also struggling to find the code that generates the camera and semantic images, so I'm not sure where to add the depth image functionality.