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August 13, 2022, 02:20:16 AM

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TIGSource ForumsDeveloperTechnical (Moderator: ThemsAllTook)LWJGL 2: AABB Collision code not working?
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Author Topic: LWJGL 2: AABB Collision code not working?  (Read 151 times)
Digi-Space Productions
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« on: July 28, 2022, 02:26:12 PM »

Hello, I am developing a game in Java 1.6 using LWJGL 2.

I am trying to make AABB collision, here is my code:

Code:
public boolean isIntersecting(AABB box2) {
        if
        (center.x + half_extent.x < box2.center.x + box2.half_extent.x && center.x - half_extent.x > box2.center.x - box2.half_extent.x &&
        center.y + half_extent.y < box2.center.y + box2.half_extent.y && center.y - half_extent.y > box2.center.y - box2.half_extent.y)
        {
            return true;
        }  else return false;
    }

When I take a AABB box, say, box1, and I see if it intersects with box2, it never results in a true, something wrong here?
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ThemsAllTook
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« Reply #1 on: July 29, 2022, 06:18:58 AM »

I spot what might be the problem. My parsing of the conditional boils down to this:

Code:
if (left1 < left2 && right1 > right2 &&
    bottom1 < bottom2 && top1 > top2)
//...

If you run through the logic, that won't ever be true except maybe in some cases where one of your boxes has a negative size. What you probably want is to check opposite sides against each other, like this:

Code:
if (left1 < right2 && right1 > left2 &&
    bottom1 < top2 && top1 > bottom2)
//...
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Digi-Space Productions
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« Reply #2 on: July 29, 2022, 07:14:19 PM »

Thanks a bunch!
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