Hi, I have nearly finished writing a Collada-output library to make 3d animation files. Before doing this I have looked at two libraries on hackage that parse Collada to display it. For my library I have copied the types from gpipe-collada and extended them. Now I am thinking that it would be nice if all 3d libraries would use the same data type. Currently gpipe-collada, graphics-formats-collada, obj, ... parse 3d-formats. FieldTrip, lambdacube-engine, ... (to mention examples) can generate and/or display 3d-objects. But they all cannot be combined without tedious type conversions. The obvious argument is that every application has its own needs. This is of course true but I think that the Collada format shows how to deal with this (you can do quite a lot with profile_common). I would be willing to write patches for some libraries and make a discussable 3d-types library based on Collada. Hope you agree, Tillmann