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How to select an already placed 3D object through Raycasting?

I want to select an object through Raycasting in ARCore Unity in HelloAR example (The one where we put Andy GameObject on horizontal planes). Once I have placed the object in the real world, I want to ...
GitHub

Cub3D is a simple 3D game engine project inspired by Wolfenstein 3D, developed as part of the 42 school curriculum. It uses raycasting to render a 3D environment from a 2D map.

Raycasting is a rendering technique used to simulate a 3D environment from a 2D map. In Cub3D, raycasting works by casting rays from the player's viewpoint into the map grid to detect walls and ...