Yep if the other person can save their the scene as an object file in Vue and export as an object then you can import the full scene into Bryce as an object and add the Textures manually in the Material editor then you would be able to build your indoor scene...Now if you build the whole scene in Bryce and want to export out as an object you need to build the whole model with terrains(and you can use different MASKS to build things in Brce's awesome Terrain Editor) and here I am not too sure but I think you can export as a whole object if you group together...As for using Vue for the plants and Trees just have them render a single plant or tree with a black background then render a mask of the same object and save in the same folder nameing the second file plantmask ect...then bring into Bryce thru the Picture editor....I know you already probably know what I have typed above but it never hurts...