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AppGameKit Classic Chat / [SOLVED] SetSpriteShapePolygon() dont like negatives Y values

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XANAX 2B
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Joined: 20th Jun 2003
Location: Corsica (France)
Posted: 17th Apr 2018 23:51
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Hello,

I've discovered that testing collisions with the polygon shape below not works when the Y of the points are negatives.



Is this a bug or a mistake i've made ?
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Bengismo
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Joined: 20th Nov 2017
Location: Yorkshire, England
Posted: 18th Apr 2018 00:19 Edited at: 18th Apr 2018 00:20
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This post has been marked by the post author as the answer.
It works fine with negative Y values. Thats not the problem.

The problem is that you have created a concave shape...or at least... 2 of your points make the shape concave in places (index 2 and index 10). this creates problems in the collision detection as it needs a convex shape due to the way the collision works. Alternatively you can use multiple convex shapes to make up a concave one.

If you use the following points it will work fine...


Ive edited index 2 and index 10 to allow the shape to be convex so it works
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XANAX 2B
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Posted: 19th Apr 2018 08:05
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Thanks a lot Bengismo.
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