[yt-dev] Loading data in spherical polar coordinates

Hi Everyone, I have data which is in spherical polar coordinates, so basically rho(r, theta, phi) and I can't seem to find an appropriate interface in yt to load the data with. Is there a function that can do that? If not, is there a function that takes in as an argument the (x,y,z) coordinate for each data point that I want to plot? i.e. take in as an argument, a 3D array which is the full grid. The current interface only seems to take in the bounding box. Thanks, Mani