   all meshes at the same coordinate system.
  hello,when loading a mesh, it can place itself anywhere according to the program that made it.( it has a local coordinate system )how force them to be loaded at the origine of the local coordinate system of our engine for translating them easier ?i hope to be clear..thank you for your help... 
  Normally, your artists would either build the mesh so that its origin is positioned at a convenient place in the modelling package (i.e. at a soldiers feet), or place a locator which is loaded with the model to explicitly show where the origin should be.If your art resources are positioned awkwardly, it should be possible to find the models center (or other "nice" point) by finding the extents of the mesh and working it out from that.T 