I have some images (not photos or videos, but 3d still renders) that I want to upload as 360 panoramas on youtube. There are six different images, one for each face of a cube. Does youtube support these types of images? What steps need to be taken to get them on there? Are there tools to process the images, or does youtube accept them in this format? Thanks!
Youtube only accepts 360º video, not stills, so you'd have to render it as a video, first, so no, you cannot use a cubic map directly.
Youtube's 360º video format is basically using the 360ºx180º equirectangular mapping for each frame of the video, so you'd also have to convert the cube faces you have to equirectangular with a tool like Pano2VR or Hugin. You would then have to fill a video track with that image for some duration.