Hi there, I am extremely new to building in Second Life in general, nevermind mesh, so it's probably not too much of a surprise that I'm running into big issues with my current project. My partner and I have rented a small apartment in an RP sim. We're able to rez objects inside without issue but we can't edit the internal walls to suit our tastes or anything like that. So what I wanted to do essentially is to build my own wallpaper onto the existing walls. I've been able to do this fine using prims and it looks quite good in-game but the problem is that we have a limit on how many prims we can rez inside the apartment (75), so all of my little wallpaper prims amount to 19 prims in total, which is bad! My plan was then to convert the wallpaper prims into one big mesh by exporting the prims as collada and playing about with it in Blender a little bit. I did that to the best of my (limited) ability, cleaning up the mesh a little bit and uploading it to SL, this cut the land impact down from 19 to 3, which was definitely good. But I have two issues. Firstly, I can't seem to get the physics working properly with the architecture, namely you cant get through either of the two doors or walk about inside. I've tried playing about with the physics sliders several times over on the test grid to try and get it working but at the moment the only thing that seems to work is making the object phantom. Which isn't ideal because then you can just walk through some of the additional walls that we added to the apartment! The second issue is that the mesh once imported is actually bigger than the prim version despite the mesh being constructed from the exported prim data. I'm not sure how to fix this but it's a big issue because we need the surfaces to be pretty much identical to the current prim version so that it fits perfectly to the walls. That was the main reason why I constructed it in-world with prims first, so we could get the perfect fit. I've attached a screenshot below so you can see the size differences between the two buildings. Ignore the external roughness, it cant be seen normally since most of the 'walls' are just internal surfaces rather than true walls. The pre-existing apartment walls cover the outsides. Screenshot: http://i58.tinypic.com/2s0bswo.png I'd love some help to get this working properly, because customising the walls would be lovely, the current wallpaper is.. not pretty and doesn't fit the colour scheme of our furniture. I've seen another person nearby having done a lovely job of making custom walls for their apartment and they managed to get the entire mesh down to only 1 land impact, which I'd love to know how to do. Help me, mesh gurus! <3