1. A method for three-dimensional video coding, the method comprising: receiving input data associated with a current depth region of a depth map in a given view; identifying a co-located texture region of a texture picture corresponding to the depth map in the given view; determining first motion information for the current depth region depending on second motion information associated with the co-located texture region, wherein the first motion information for the current depth region is set to pre-defined motion information or set to derived motion information if the co-located texture region of the texture picture or any texture sub-region in the co-located texture region is Intra-coded or has no valid motion information; and applying coding or decoding to the input data associated with the current depth region using the first motion information.