Highway of Life said:
Okay so I've heard that when you import a sprite into EV Nova, it uses the same rlë ID for both the pict and the mask.
If this is true, why do all the shäns have two seperate ID's for base, alt, glow, lights, and shields sprites and masks?
If you are using RLE sprites, the mask field is ignored , since the RLE includes both the sprite and transparency data. It is only used for PICT sprites, which require a separate image for the mask.
It is filled in for the default EV Nova scenario only as a leftover from when the game used PICTs, before RLE was supported; since it has no effect, it wasn't worth while to go back and change them all to -1.