Question about Nebula add-on

[Zee]

Hello all, I am new to Celestia and have been going through the add-on guide trying to get acquainted with the program. I encountered a peculiarity with the simple nebula add-on in the guide and after some research with no luck decided to come and post here.

The NGC 3372 nebula just shows up as a 2D rectangle floating in space. The full image is there but it's just a small rectangle, not a 3D image. Is that how it is supposed to look? I downloaded and unziped the file into my "addons" folder within the "extras" folder. I double checked to make sure all the files were in the right place and it looked like they were. Any suggestions?

Thanks much!

[selden]

Yes, that's exactly what that example is supposed to look like. It's just a 2D "billboard".

You may have overlooked the description:

Note that this model doesn't define a complicated 3D shape for
the nebula itself. Instead, it's just a thin rectangular block
for holding a photograph of the nebula. To learn how to use
"billboards" to display astronomical photographs in Celestia,
please see <a href="billboard.html">billboard.html</a>.

[Zee]

Ah okay, thanks for the explanation mate.