Feb
15
2024
15
2024
Check if point is inside polygon 2D (using line intersection)
An article by 
Info:
“Each time the ray crossed the boundary of the polygon, it would cross from the interior to the exterior, or vice versa. Therefore, the test point is on the interior if, and only if, the ray crosses the boundary an odd number of times“
https://www.topcoder.com/thrive/articles/Geometry%20Concepts%20part%203:%20Using%20Geometry%20in%20Topcoder%20ProblemsTested the algorithm above and seems to work! : o
Source:
https://gist.github.com/unitycoder/e769e6e7f4d0ee50f983d1265e6f15d9Line Intersection method:
https://forum.unity.com/threads/line-intersection.17384/#post-4442284Note: Unity has build-in method already,
https://docs.unity3d.com/ScriptReference/Collider2D.OverlapPoint.htmlVideo: (making of)
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