I have a 4000x2000 layout,
and the view is 600x480,
so how can I add a 600x480 background that sticks in the back and if I move in the map (platformer) the background keeps the same always? (Just flat background)
Set paralex for the background layer to 0,0
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here is a tutorial on Parallax:
The top layer can also be set to 0,0 for making a user interface that floats over the moving background.. (scores, radar, lifes, etc.)
Put the background image in a different layer. Set that layer to be the bottom one. Go to layer properties and set the parallax to 0,0.