We have a serious problem when using the built-in Tilemap which makes us use Rez Rainbow Tilemap Importer instead. Does Scirra have any plans to improve Tilemaps?
We need a fill tool to properly lay tiles like a map editor does. OR we need a way for the rectangle tool to support the tile size we set which is 16 by 16. Instead it seems to only support 4x4.
If you're gonna be spreading out a simple grass texture like that then the Tiled Background Object is probably more suitable. Tilemaps with extra details can go over that.
Or you can just use Tiled's fill tool and import the .tmx into a C2 tilemap object in the layout editor.
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The Tilemap Bar for placing tiles in the layout: