Template Previews
In the Customize screen, there are previews of each island. These previews are typically generated using the existing
structures located in the templates/islands directory. However, you can also set a custom preview template or image by
putting it in templates/icons. For more information about directory structure, look here.
If you want an image to be used for a preview, you simply need a square image. The name is based on the name in the
template list. The name will be lowercased with special characters
being replaced by _. Characters which will not be replaced are _, -, /, and .. Letters and numbers aren't
replaced, too. If you're still not sure about the file name, look at the log file. You'll find a line with the required
file name.
Valid file types are .png, .nbt, and .snbt. If there are multiple possible files, because they have the same name,
it will choose the first it finds in the following order:
.png.nbt.snbt
Using a template may sound useless in first place, but considering that there may be large islands with thousands of blocks, it may be good to have a lightweight preview template with much fewer blocks. Or you want to hide a hidden secret?