Methods and apparatus for receiving content including images of surfaces of an environment visible from a default viewing position and images of surfaces not visible from the default viewing position, e.g., occluded surfaces, are described. Occluded and non-occluded image portions are received in content streams that can be in a variety of stream formats. In one stream format non-occluded image content is packed into a frame with occluded image content with the occluded image content normally occupying a small portion of the frame. In other embodiments occluded image portions are received in an auxiliary data stream which is multiplexed with a data stream providing frames of non-occluded image content. UV maps which are used to map received image content to segments of an environmental model are also supplied with the UV maps corresponding to the format of the frames which are used to provide the images that serve as textures.