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RE: Cats keep going under the house
Actually, it's not poor quality builds.
It's that the cats change back and forth from physical to non-physical, move, and change poses. Every time they do there's a teeny bit of rounding error. Over time that builds up until the cat finds itself "inside" a prim. Once that happens the prim, from the point of view of the cat, becomes phantom and the cat can move freely until it is once again "outside" that prim.
This effect is larger with the cat's positon. But, since the largest X/Y dimension is 256, the effect is never that large in the horizontal plane (so it's less likely that cat will walk through a wall). But the vertical (Z) rounding error can be much larger (so it's much more likely a cat will fall through the floor in a high skybox than on the ground).
[N.B.: The "ground" is not a prim and never goes phantom with respect to the cat, so the cat can't fall through the ground.]
The "1 meter" rule of thumb is just that. What matters is the edge, not the size, of the boundary prim. The "1 m." idea is based upon anecdotal evidence. No matter how large the prim, there is **always** a chance the cat will walk/fall through it.
In most cases, setting the cat's range lower will help prevent walking through walls (but do little for falling through floors). But way back when KittyCat's were young (well before their first birthday), when I first noticed these issues, I made a video (long lost) of a cat walking through a wall, getting stuck outside and working it's way through prim after prim until, hours later, it was on the far opposite corner of my sim, even though it's range was just 5 meters (just enough to come into contact with the walls).
Finally, all this only lasts until it's time for the cat to sleep. When the cat sleeps, it "teleports" to it's Home.
Usually, this is fine. But it's possible to create a parcel layout where the cat can fall to the ground and walk around, only to find itself on the far side of a "no object entry" parcel when it's time to "teleport" Home. If Home is far up in the air. the cat will begin to "teleport" to find it cannot make it and will bump into that "no entry" barrier, stopping there, often far up from the ground and far down from Home. Calling it Home with a HUD won't help (same problem). All you can do is find the cat and take it into inventory. You might try teleporting to the cat, and, if that fails, moving to another corner of the sim and trying again. (Or you can just file a ticket and let a CSR deal with it.)
And now you know far more about the issue than you ever wanted!
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