So, some things to remember with height maps, based on if you made them on Gimp.
For a Height Map;
' Make sure it's a .png
' Make sure it's in grey-scale,
' Make sure that the file is either 512 height by 512 length or 513 height by 513 length
' Try opening ' Watermillterrain ' in gimp, and then making your height map over that, then when you come to save it, you
just export it as a different name.
' Try loading a height map you know will work first, for example " Watermillterrain "
For Masks;
' Make sure it's a .png
' Make sure it's in colour mode
' Make sure that the file is either 512 height by 512 length or 513 height by 513 length
' Try opening ' Watermillmask ' in gimp, and then making your mask map over that, then when you come to save it, you
just export it as a different name.
' Try loading a height map you know will work first, for example " Watermillmask "
' Try to use Red, Blue, and Green as your main colours.
Also if that doesn't work try saving your height / mask in My_objects.