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Asked: 2026-05-28T13:16:52+00:00

I’m using a 3800×3000 bitmap as a background of a game. Now, I first

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I’m using a 3800×3000 bitmap as a background of a game.

Now, I first show the whole bitmap – the landscape -, and than zoom in at the characters.
I’m using TweenMax from GreenSock, but even with this advanced tween class my bitmap doesn’t move and scale smooth.

Any ideas how to solve this? I’d like to work with smaller bitmaps too and scale them, but than I’ll lose the quality, and I can’t blur the bitmap to hide the quality loss, since there’s a terrain in the bitmap too, and I don’t want to blur that.

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1 Answer

  1. Editorial Team

    Why is the bitmap so large? Does your target device / screen extend to 3800×3000?

    Suggestions:

    1. Sidestep the problem. Use a smaller bitmap, or break it into several small bitmaps, or reproduce more of the background with vector shapes. Obviously not every piece of art can be recreated as vector, but if you can you will get huge file size savings and some performance improvement.

    2. Make sure cacheAsBitmap is enabled. This tells Flash to optimize the rendering of bitmaps. It works best when the bitmaps have no filters, few transforms, and do not move or rotate often. It’s ideal for unmoving backdrops.

    3. HARD MODE: If you want to get extremely fancy and your target audience supports the latest Flash Player, try creating your backdrop as a texture for a rectangle in the 3D space that exists behind the 2D stage. See this post by Thibault Imbert for an idea of what I mean: http://www.bytearray.org/?p=2555

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