can't find light source!

I have a ghost light in my house, just below the floor.

It's been there a long time. I noticed it some time ago, started looking for the cause, and found a lamp behind the wall, and figured it was just the lamp (but odd that the light was on the wrong side, and not quite centered ... well heck it's SL, and I have alpha textures in the wall, etc).

I should have moved the lamp ... because I did move the lamp and the light is still there. I can find the exact center of it, but there's no prim there that I can find.

I tried turning off "select only my objects", "limit select distance", and "select by surrounding". Still no dice.

I figured it might be a megaprim (though not too big a one, because my 4k isn't totally covered in blue on minimap). It could be 20x20, though, maybe a bit bigger. I backed WAY off, selected everything in the neighborhood (draw distance to 512). Still no dice.

I would suspect a phantom prim, but I'm sure there've been rolling restarts since I first noticed this.

I can find the center by passing a flat object through the space. I see the light build up on it until I approac the center, at which point it peters out. Right at the center, it's dark, then as I keep going, it builds again and then fades again. (Is that what the falloff distance is? Or is that an indication of how big the prim might be?)

I tried scanning for it with a simple script; no dice.

Any ideas?
Thanks

Damn, did I leave my halo there?

Turn on advanced menu Ctrl+Alt+D, then choose Advanced/Rendering/Info Displays/Lights. This will help you find the light source.

Just wonder if it maybe is just invisible+phantom. Lots of primlights are. Try Ctl+Alt+T. If that doesnt help show you where it is then its maybe an invisiprim. If it is then stand close as you can to where u suspect it is. Then use your cam controls to pan your avatar behind the point you suspect. If is an invisprim you will get a "hole" in your avatar, kinda like an eclipse of the sun, and u can right-click on it then.

Well, if you have a large, hollowed cube, for instance, and set it to have a light of small radius, there will be a light shining inside the cube that looks unconnected to anything. Perhaps that's it.

I'd check surrounding area prims in case one is set to light.

Like this:


In this pictures the standing hollow grey cube has a 2m radius light that lights up the floor and the 3 small cubes.

and there is no beacon for lights, nope, there should be

Indeed there should, but what Kenbro said is almost as good.

Good luck hunting for the source.

That's interestng. I'd be tempted to try that again, with a script in an object centered close to the apparent light source, and with a very small scanning radius, something like:

llSensor("", NULL_KEY, ACTIVE | PASSIVE | SCRIPTED, 1.0, PI);

I'll bet it finds "Object" which is a hollow megaprim surrounding everything, a la Osprey's suggestion.

If it finds nothing, then I'll still bet it's that hollow megaprim, but it's linked as a child to some other prim that's not so close by.

That's exactly what I did, and no dice.

Osprey, as I said above, I zoomed above quite a ways, and selected everything in the neighborhood, and there is no prim centered at the ligh source. If that's not what you meant, please clarify.

Thanks -- I look forward to trying Kenbro's suggestion.

Did you also try Wireframe view? (Ctrl-Alt-R, I think)

Could you post a slurl or something

Did you find it? If so, what was it?

Kenbro's tip solved the problem. As it turns out, the light was coming from a floor panel. The reason I didn't suspect that panel is that it's a 20x20 mega cut down to 20x10, so the glow came from its edge (understandbly, because that's the uncut object's center.) To make it more confusing, the center of light was about a half-meter below the prim, for no reason I can think of, other than that megaprims are goofy.

Thanks again! My home is now dark at night.

Probaly the megaprim was also dimpled to reduce its thickness. A lot of the original Gene Replacement megas are like that.

It's a Gene Replacement 20x20x.5. I bet you're right.

See, SL really is simple, after all. And here I thought it was complicated!