creating an opacity mask without having to have every single mask shape as a separate texture

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:bust_in_silhouette: Asked By mymokol

I followed this video to get a simple opacity shader:

However, it requires the mask to be a texture, that needs to be saved in the game files. I don’t want to have any more textures than needed, and would much prefer to make this using a tileset or something similar, for the sake of disk space and ease of use (i wouldn’t need to copy every single shape of a room in a graphics program). Is there a way to do such a thing?

If I left out some important info, please let me know.