cylinders larger then 10 meters?

Re-did the dome as 13 prims. Didn't need the second ring of flat panels.

I figured out a way to make a 20M diameter floor to fit inside my circular wall. The new floor goes right to the edges, without any prims sticking through the outside wall. It took 12 prims and becomes a 16-sided polygon, but there are no open seams, and nothing overlaps, except where the faceted outer edges meet the side walls and stick slightly into the walls, to hide the facets. And the whole floor can still be textured in a clean pattern, so you can't even tell how many prims it's made of! I think I could expand that to 24M diameter or so, and it divides neatly into halves or quarters.

Mind puzzle for you builders. Use 12 standard prims to make a roughly 20M diameter flat 16-sided polygon, aproximating a circle. All prims must meet exactly edge to edge, with no overlaps. All prims can be made from the edit dialog. No 'prim torture' scripts required.

Hint: There are three shapes used...

You can see it in Kitsune Valley, just over the wall from the merchant area, if anyone wants to get a closer look at the structure. I won't waste space here with more snapshots, unless someone wants to see my prim pattern for that 20 M circular floor layout.

You can make big single-prim cylinders from toruses as long as they are shorter than 10 in one dimension. I've made cylinder that are around 15-16 meters in radius and 3 meters in height.

I think I might be able to do it with 8 or 9, exactly 20 meters diagonally across vertex-to-vertex. I'll try this evening when I get in-world.

Argent, I'd certainly be very interested in seeing any solutions that use less than 12 prims for a 20M circular floor.

Remember, no overlaps! It has to produce a floor you could walk on, and not fall through the seams!

I'd also want to know how well it can be textured, Ideally, it should be possible to adjust the repeats and offsets just once per exposed face, and then be able to apply a standard tiled texture without having to pre-distort it.

My 12-prim solution can accept a floor tile pattern on the top faces, and a ceiling texture on the lower faces, and none of the textures distort. Each side looks like a seamless fill on a continuous surface. (Unless the lighting glitches at dawn or dusk screw up individual prim's lighting levels. )

You can make a single prim ~20m circular floor. Make a torus size 10 in all dimensions, twist begin 90, end 90, hole size x 0.95, y 0.05

Even with planar textures you're not going to get a clean floor out of that.

Well, this is where you gotta compromise a bit. Sure, if you want a perfect stonetiled floor that may not be possible. However, that's no reason not to be creative and find a look that does look good. The thing is that those stripethingies you get out from the center of the prim can actually look good if you use the right texture.

OK, I checked. I got a nice clean 12-sided "circle" out of 9 pieces... but it didn't extend to 16 the way I thooought it would, and I didn't get a chance to try the 8-piece scheme.

use inner cut on it and you can planar texture it just fine, no distortion whatsoever. try an end cut of 0.50

Wow. That rocks.

Compulsion sent me a 20M Torus floor in-world.

One side can be nicely textured, while on the other the texture is hugely distorted. It also has a thickess of 0.01M, and can't be thicker, or it won't texture right.

That said, one could use a pair of them, bad side to bad side, spaced the distance apart you want for the floor thickness, to get a 2-prim floor that can be textured on the bottom as well for the ceiling of the floor below. You can walk on it with no problems.

Also, the torus floor can also be cut fot a 3/4, 1/2 or 1/4 disc floor, and still works.

Kudos to the Torus solution!

I am sad to report that the above solution from Compulsion, with the torus for a 20M diameter round floor as a single prim, no longer works.

The last set of updates changed something, and now the torus is not solid near the edges in this configuration. The center is fine, but close to the edge, you fall through it.

Ceera,

that was happening before too. Some avatars were falling through, some weren't. I suspect it might have something to do with sim load too.

Candide, it was happening to me in a sim where I was the only one there, and where the sim was at only 1/3 of it's total prim count. In a lag-free sim at 500M up...

I've dealt with parts of floors becoming phantom, when two adjacent prims ever so slightly overlapped. This was something else. In that old bug, all of one prim became phantom, until you fixed the overlap. In this one, just part of the torus becomes phantom...

Prior to this last pair of updates, the twisted torus stage that I built made a rock-solid 10M Radius quarter-circle, that was solid and stable all the way to the edges for everyone who walked on it.

Now, that same stage is intangible in the outermost 4 meters or so, no matter what I do to the torus. I even re-created it out of inventory, as just the single-prim torus part, to ensure it wasn't becoming phantom because some part overlapped another prim...

The shape is dead.

I've rebuilt the stage, using 4 cut cubes to make a close aproximation of the quarter circle. Makes 1/4 of a 16-sided polygon, but it's close enough. With 12 prims, I can make the 20 M diameter circular floor again. But that's 12 instead of just 1, before. *sigh*

Now I have to go back to an earlier build and replace it's single-prim floor with 12 prims...

At least I didn't get around to making one structure, that would have had 9 of these floor sections in it!

Well I have a sky platform built out of tori with 20m diameter and it's still solid. Some people fall through around the edges, but I don't so it's OK

this is very easy to do, near to 20 meter across, height is only issue, hav eto get back on to get my notes on how i do this

I learned how to do it from this post by BamBam Sachertorte:

<shameless plug>

If anyone wants to see them in use, dial the Garuda Stargate...or use some other means to get to the southern edge of Garuda. I just like the Gates.

</shameless plug>

yep, that s what I found out also, works very well

Go to the Ivory Tower Libarary of Primitives [Natoma(207,170,25)]. You will find a demo there, if you look hard enough, where Lumiere Noir explains how to build huge circular floors, etc., using his "one prim" methods. Simple and effective.

"Forget the math; accomplish the effect."

*smiles* might want to take your own advice dianne. sounds like this is way too personal for you. let's get back to helping one another on building advice, rather than getting egos involved when someone points out that your way might not be the only way.
well wishes