Prims above 10m in size.

I bookmarked this post ages ago. It demonstrates how to make a 19.5m cylinder from a 10mx10mx10m tube. I've used the technique quite a lot since then, but have never really discovered whether it's possible to torture other prim shapes into sizes above 10m.

I've looked for docs but can't find any. Anybody care to enlighten me?

That trick only works on tubes, rings and tori.

1. With a tube you get a flat disk with sharp edges.
2. With a torus you get a rounded disk with a dimple in the center.
3. With a ring you get a disk with sharp edges that tapers down toward the center.

If you give a ring -90 degree twists then it tapers down toward the edge but you have a hole in the center.

You can twist a torus into a 20M diameter paper thin disc. But the last time I checked, if you walk on it, you'll fall througth the edges. Used to work, but doesn't any more. Guess you could still use the trick for a round ceiling...

I had a build I made once with ceilings and floors made from these 20M diameter discs. Had to scrap every one of them, and make the floors and ceilings with normal sized prims.

In short, yes, there are ways to make some shapes of prims get over 10 M in some dimensions, but they are unstable, and likely to be unsupported in future releases. I wouldn't bother with them.

Thanks guys. Not sure why I didn't apply -90 degree twists to a torus before because it gave me the exact shape I was looking for. Regarding tortured prims being unsupported in future releases, why would that be? These eccentricties aren't exclusive to Second Life and appear down to the geometry of the prims themselves. Certainly the tube trick I referenced initially produces identical results in blender. Given my early building experiences when I made regular prims so thin that I fell through my floors, I'm not sure I'd have trusted the paper thin torus.

A box! Shear it in any direction and flatten to make a 15x10 wall: textures will need to be offset a bit, I believe 0.250 in a certain direction.

After lots more building using these shapes, I think it's a shame an arch* can't be constructed from one or two prims that would match the curve of the tortured 15m diam torus. The dimple makes it impossible. You'd be able to make some amazing, ultra-low prim buildings that take full advantage of the most common 512m2 footprint (16mX32m) -- without compromising on design.

* By arch I mean, in normal prim terms, something like a cylinder, path cut 0.250/0.750 and hollowed...to fit between two spheres, path cut 0.250/0.500.