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  Pixel perfect collision detection?  (Read 1032 times)
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Offline wreed12345

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« Posted 2012-12-13 21:35:14 »

This is something i need for my game as collision detection is not as accurtate as it needs to be... so, do you guys have any idea how to do this? I do not ... Cry

Offline UnconventionalT

Junior Newbie





« Reply #1 - Posted 2012-12-13 21:46:14 »

2 topics alone on the first page of the Game Mechanics board.

http://www.java-gaming.org/topics/perfect-colision-system-in-lwjgl/27836/view.html
http://www.java-gaming.org/topics/2d-collision-detection-best-approach/28040/view.html
Offline wreed12345

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« Reply #2 - Posted 2012-12-13 21:50:17 »

Im not using the LWJGL since im on android
and the other one does not have an actual answer

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Offline Ultroman

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« Reply #3 - Posted 2012-12-13 22:23:53 »

There are many different solutions suited for many different situations. Could you link to a screenshot explaining what you're dealing with?

There's the brute force method, but it is rarely good on its own. Then you'd use quad-trees as a broad-phase tester.
But if you have a simple platformer, you could make do with bitmasks, or even just have an array of ints representing the y-height of each x-width in each ground-tile.

- Jonas
Offline wreed12345

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« Reply #4 - Posted 2012-12-13 22:35:28 »

how do i post images? i only see an option by linking it to a website

Offline UnconventionalT

Junior Newbie





« Reply #5 - Posted 2012-12-13 22:42:19 »

The first link has a post (by yours truly) at the bottom of the thread detailing how one goes about implementing pixel-perfect collision. The second link contains a simple method for basic collision detection in games. The basics behind 2D pixel-perfect collision detection methods don't exactly change from engine to engine.
Offline wreed12345

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« Reply #6 - Posted 2012-12-14 00:28:14 »

Ok so after reviewing your thread i noticed this code
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public static boolean intersectsByte(byte[][] a1, byte[][] a2, int x, int y) {
    for (int i = 0; i < a1.length; i++) {
        for (int j = 0; j < a1[0].length; j++) {
            if (a1[i][j] == 1) {
                for (int k = 0; k < a1.length; k++) {
                    for (int l = 0; l < a1[0].length; l++) {
                        if (((k - x) >= 0) && ((k - x) < a2.length) && ((l - y) >= 0) && ((l - y) < a2[0].length)) {
                            if (a2[k - x][l - y] == 1) {
                                return true; } } } } } } }
    return false; }

I need some help understanding this however. If i already have two bitmaps setup how to I use this code to detect pixel perfect collision.?

Offline UnconventionalT

Junior Newbie





« Reply #7 - Posted 2012-12-14 07:38:09 »

One method that would work would be to simply convert both of your images to byte[][] arrays, where 1 represents an opaque pixel and 0 represents a transparent pixel. That may not be the best method, though.
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