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I'm making a mining/building game in java using slick2D and I want to make it so you can only see a few blocks in any direction while you are underground. The best example I could find of what I want to do is the game miner dig deep.

enter image description here

One way I thought of doing it would be to have a large image and just draw transparent areas on it where you need to be able too see but even if that would be an efficient method I wouldn't be sure how to do that.

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Couldn't you just mask your buffer? Or have a texture with alpha overlayed on it? –  Sidar Oct 18 '13 at 0:37
    
if you want to mask in a rectangular area, consider using glScissor –  PeterT Oct 18 '13 at 1:01
    
It needs to be circular and I'm mainly using the slick libraries for rendering. I don;t know that much about openG but if someone could provide an example I would be able to implement it. –  Ephyxia Oct 18 '13 at 3:07
    
slick.ninjacave.com/forum/viewtopic.php?t=3598 –  Sidar Oct 18 '13 at 10:06
    
@sidar Thanks for the link I got it working. –  Ephyxia Oct 18 '13 at 22:38

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I'd just make an image with a transparent circle in the middle and the rest entirely black. Then just render that over everything else in the game (except for the UI of course).

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