Methods, apparatus, systems, and articles of manufacture are disclosed. An example system for avoiding collision for virtual environment in a shared physical space includes a first mobile device associated with a first user, a first mobile device generating a first virtual environment, a second mobile device, associated with a second user, the second mobile device generating a second virtual environment and a server. The server includes an index map generator to generate a first index map and a second index map from the first virtual environment and the second virtual environment, respectively, a collision detector to determine a collision likelihood based on a comparison of the first index map and the second index map, and an object placer to, in response to the collision likelihood satisfying a threshold, modify at least one of the first virtual environment or the second virtual environment.