Well I know that obj won't import textures if no .mtl file is created, but for 3ds, textures are normally imported ok, unless you are using Amapi procedural shaders. In this case, Vue, or any other app cannot import the textures, because procedurals don't translate well from one program to another, but if you use a bitmap for your texturing in Amapi, then it will translate into Vue if you export in 3ds.