Building 1900+ meters in the air???

I stumbled onto a place called CARICAVATARS, I guess they do caricatures or whatever. they have some kinda "artsy" exhibit in mid-air now, anyway...I TPed in via the listing in the "Places" Search, and landed on a platform 1987 meters in the air. The stores' bot was also on a platform across from me.

While I couldn't figure out how to get into the shop (everything was black, and my platform was surrounded by nothing, so I just fell.), I was amazed, because I haven't been able to build higher than what, 800m in the sky? How do you build 1987 meters up??

RC6

Or Nicholaz EC-f over 1.19.1.4

Nice, I never woulda guessed...thanks! I have both of those Clients. (don't ask). It's time to take my skybox off the radar

RC 1.20 onwards allow building up to 4096 metres. If you build stuff up that high, it's still there if you use an earlier viewer, but you can't add to it.

To expand on this
Not only can you not add to it, if you try to move prims that are already up there, they shoot down to 768 meters.

I don't know if resizing, shaping, etc does the same, haven't tried it.

it stays up at 4096 meter after server reset, right?

Yes. The server can handle it fine, the thing that resets it when you try to move it with the older client is that the client is hard-coded to allow building only to 768 m.

They've updated the servers, so resets and such are fine, they just haven't made the main client build-capable at altitudes higher than 768m yet.

The trick right now with using the Release Candidate (1.20 RC6) or Nickolaz' latest viewer to build over 768 M up is to remember that the old rules still apply if your guests, or yourself, use any other client to get up there. For example, I built a test skybox at 3,000 M up over my land. I needed to lock pretty much everything that was up there, to ensure that no one with mod rights could try to move anything while on with an older client. And I didn't feel that I dared to use any doors that move, because if anyone on an older client used those doors, the door and anything linked to them would zip down to 768 M.

There's also an issue that very few of the existing TP systems can get you any higher than 768 Meters. To get to my skybox, which I built the same day the RC0 candidate first allowed building that high, I had to TP up to a normal skybox at 700 M up, and then ride a "sit elevator" from there to the 3,000 M skybox.

WarpPos DOES work higher than 768m.

However, still somewhat limited. I tried using it to go from 900 meters to 4000 meters, and ended up at about 1800, falling from the sky.

However, it DOES still work, it just seems to have a limit to how far it can travel anyhow. (We never wanted to go 900+ meters in a single jump before, really)

The trick is to use a few sequencial jumps with WarpPos, just like WarpPos breaks up the rule into upto 10 meter jumps you break the WarpPos call into 1000 meter jumps.

Somewhat along the same lines, I've also found that if you set your home position in the normal viewer to a location above 768 meters (I tried it at 4070 meters), when you teleport home it'll send you to 768 meters. But if you set your home position above 768 meters in the RC viewer, then switch back to the normal viewer, you can then teleport to your home location at higher altitudes just fine.