Invisible object-can't be seen with highlight transparent

I am reposting here from tech forum

I put up a prefab house (rented land) and have a small area in the upstairs floor, which my avatar is blocked by and has to walk over, driving me crazy. I can see nothing there in wireframe or with Highlight transparent turned on. It has to be some kind of invisible prim or some kind of bug.

If the object was already here before I put up this new house I hadn't seen it.
What else might it be?

Was there anything there that you deleted right before this started happening?

Sounds like a ghosted prim, and if it's a private island get the owner or an estate manager to restart it. If it's mainland request a restart through the support portal.

I had had a previous house there.

...if it was already there I hadn't noticed it, the house I had there previously was a one story.




Whatever it is, it is small/minor enough. I wanted to avoid bothering the Sim owner with a sim restart because it is so minor. It amounts to a area on the upstairs floor about a meter long and causes an avatar to have step up about a foot or so to get over it.

It must be a ghost prim. I don't know if there is any other way to see, find or remove a ghost prim? Most advice I see on the web about ghost prims resorts to sim restarts.

I don't know of any way personally..

And really, a sim restart isn 't much trouble. You hit a button, then go down with the sim, and by the time you are able to log back in, it's back

I put in for a sim restart...i've searched all over and found no other solutions. It's kind of a pity to not be able to detect and remove a ghost prim. Thanks for replies. Funny this prefab house is called "haunted house"

Have you tried relogging? It could be a simple cache discrepancy. Your computer thinks the prim was deleted, which is why you can't see it, but for whatever reason, the server never got the message to remove it, which is why you can still collide with it. In cases like that, clearing your cache and relogging will enable you to see the prim again, and then you can attempt to delete it again. With any luck, it will work the second time around.

If you still can't see it after cache-cleared-relog, and you're still colliding with it, then it's time to restart the sim.

Yay for Chosen!

I learned some stuff again ^-^

Thanks, Chosen!

This has been here a few days since I put up a new house. Clearing the cache does not not solve it. Nor does taking off my shoes, etc. its just a undeleated prim stuck from either my previous houses roof, or something that was already there before i rented this land and I am just seeing it for the first time because this new house is a two story. I've run into ghosts prims before on other land, when nothing can be seen in wireframe or with Highlight transparent. There are jira entries about ghost prims but havn't seen any solutions other then sim restarts. I'll just have to wait til the estate owner sees my message.

Perhaps it is an invisible portion of some other prim? I have seen half-transparent doors for example (so that they rotate about their center but block passage on their transparent half). Or sculpted prims can have collision surfaces that extend past their edges as well.

If your house is modifiable try skootching it or parts of it to see if the invisible step-up area moves with some other prim.

Thats an idea.

I'll try that later..........at any rate no extended part is showing in wireframe or highlight transparent.

I tried moving things around as suggested above....to no avail. It's not part of any of the pieces of the house. The sim will be restarted sometime today so I'll see if that works.

Also factor in that sculpted prims really are not what you are seeing. So it maybe sculpted stairs that you somehow relinked to a solid prim as well. But it does sound like ghosting to me as well.

I had one of these appear at our rooftop cafe, in a spot where I had previously had a table and chairs.

Annoying and mystifying.

I *think* a sim restart got rid of the obstruction, but I should go back and do a more thorough, um, walk-through.

Yep, sounds like a ghost prim. Sim restart should cure it.

Well the sim was restarted a couple times and it didn;t change anything.....so it makes me suspect it is something part of this "haunted house." I messaged the builder to see what he thinks and will just wait for his reply.

What I did was create a physical object and found it moves just fine across the area at different heights from the floor--but if I drop the object in that area it will bounce and tumble off this invisible object and land a few meters away... In any other area when I drop the object it lands normally....

here is picture:



As you can see nothing appears with Highlight Transparent.

And if I go to wireframe--from any angle, there is nothing there at all.

When I first log on as the railing rezzes, for an instant, there is a jutting piece of "wood" that looks like a piece of broken wood sticking out from the railing corner, about a foot from the edge but then when it finishes rezzing it looks like in picture. Whatever it is, blocks my walking or objects will bounce off of, up to about a meter further then that.


The issue sounds exactly like this jira




But a couple sim restarts did NOT resolve it in this case as some mention is this jira entry

[url=https://jira.secondlife.com/browse/SVC-255[/url]

that's very odd. Could it be that the prim is textured with the invisiprim texture? That won't show up on highlight transparent. However you should still be able to select it with the edit tool if you click just right.

The only other thing I can think of is to try deleting the house...

i suggest lifting up all the prims within range of that problem spot as one massive bounding-box-edit-selection and see if the collisions are still occuring...then reselecting and putting back into place in one move again..(or you could have a friend come over and be prepared to try to collide with that exact area by noting the coordinates and freeing your hands to stay in edit mode, then control z'ing it yourself right back into place, or you could just stay in edit mode and fly back and forth carefully not deselecting it) that would certainly help you to determine if it's the house or any included sculpts.
did you mention if there are any megas nearby? i seem to have this problem only in areas where they are but for me the restart cleared it right up. look for any potential megas that have been reduced in size by profile cuts, hollows or twists...those will have wonky collisions when not phantom, and of course sculpted ones!
good luck in any case

I have been having a similar issue in a particular build recently and it happens in the stairwells of this particular build. I have a mainland sim. Clearing cache does not appear to help...have had several people come test the theory. I will be having the sim restarted to see if that clears it up. Last time, it took like 3-4 restarts to clear the issue.

Please keep us posted to what you find out. Thanks!

I think I know...


Is that a sculpty staircase in your picture? Is the sculpted prim not Phantom?

A sculpty that has been formed into a staircase or a thin wall or railing often has a bounding box that is much larger than the visual prim. They have to be phantom to keep from causing an impassible area near them.

Normally the builder will place a ramp under the sculpted stairs, and make the stair prim(s) phantom.

If they linked that phantom prim to the rest of the house when packaging it for sale, you'd have an impassible stair well, and possibly have an adverse affect near the stairs, too.

Good suggestion about the bounding box issue, Ceera.

I was thinking on similar lines, but for a megaprim -- but didn't havok 4 fix that?

Nope. The reason old Megaprims had major bounding box issues, and still do, is that there were mostly made from a limited number of larger shapes, and then someone path cut, dimpled, or otherwise tortured them into another shape. For example, the 50 x 05 x 1 was actually a 100 x 100 x 100 cube that had been quartered and then dimpled severely on both top and bottom. But it still had a 100 x 100 x 100 bounding box.

Some newer megaprims were recently made in a much wider range of sizes (thousands of them!) and so most of them exactly match their bounding boxes.

Havok 4 did make it less likely that a megaprim would crash a sim just by being there at all. It also did a few other things that made megaprims less hazardous.

The stairs are phantom, the walking surface is the "collision prim." and not phantom.




I already tried returning the sculpty walking surface into my inventory and it had no effect on the "ghost" I just tried it again and it had no effect on the ghost.



Yes thats how this staircase is made. The phantom stair case and the invisiible collision prim walking surface.





I checked again, the stairs ramp and chimney were packaged separately and not linked to anything. The house was in three pieces plus stairs and chimney.

The benefit of looking at it again, resulted in me getting a better alignment of the walking surface then I had had, but alas, no effect on the ghost prim.

In contemplating the ghost prim and watching its behavior when dropping or setting objects on it reminds me of how two magnets like poles repulse each other.

A prim like this covering second life would be the ultimate griefer tool if one had a large enough ghost prim.

That would all be worthwhile to try




thx, i haven't look to see if there are any mega prims nearby. I'll look around some more.

No reply from the house builder yet so I will wait patiently and try him again in case he never saw my IM.

Okay. mystery solved. The house builder contacted me and said she (differnt builder from railing. who I Im'ed yesterday) knew that the sculpty railing DID have an issue and needed to be phantom. Since it was linked to the house I had no perms for, I couldn't make it phantom without turning the whole second story floor phantom, so she sent me a phantom copy of the railing. I unlinked the existing railing and deleted it and replaced it with new phantom and voila. No more blockage.

This leads me to wonder about other reports of Ghost Prims in jira entries and how invisible scultpy parts extending may be to blame all along.

So much ado about nothing.