A perfectly seamless sky?

I want to build a small city that's completely indoors, but I want a sky texture on the ceiling so visitors think they're really outside. The ceiling is made up of several 10mx10m prims. I found what I thought were seamless sky textures but when you animate them you can clearly see the seams and the clouds don't match up.

Is there a way to somehow stretch one texture across many 10 meter prims? Or is there some other way to go about this?

Not using textures. For best effect I'd recommend maybe trying to make a sky 'dome' and use particle effects to create clouds that move with the wind?
Texture animations tend to go out of sync you see, plus they won't look all that 3D anyway. To do the texture animations you need a script resetting them all simultaneously every now and then.

You can have only a part of texture displayed on a prim by using UV coordinates smaller than 1.0, and UV offset attributes can be used to pick the desired part of image ... so setting the offsets right, you can have single image stretch across multiple prim faces.

The drawback is, it won't allow for smooth client-side texture scrolling so if you wanted the texture to scroll across all these prims, you'd need to use multiple scripts adjusting the uv coordinates 'manually' for combined effect.

why would you want your visitors to feel like they are outside, and not actually be outside? I have visited a real life mall where they had a sky texture on the ceiling to give that effect, but it rains a lot here and you get no bright blue sky at night, but In SL you can force the time of day and it nerver rains!

Thanks for the suggestions. I have a few ideas. If nothing works out I'll just use static textures for now.

The answer to "why" is because for this particular build I want to create a certain atmosphere. In fact I wish I could have more control of the "sun" setting, to force sun into "midnight" mode for instance.

You can if you own an island sim

Sounds kind of like the Harry Potter lunchroom ceiling...that would be cool . Unforunetly I'm new to SL so I wouldn't be able to give any suggestions...though I did want to say that is a cool idea though...hope you get it to work!