Refactor ear clipping algorithm to improve concave and flat triangle detection #2841
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…detection - Updated the condition to detect concave vertices: If the z component of the cross product is less than or equal to zero, the triangle is considered concave, indicating that the angle between the vectors is greater than 180 degrees. - Improved the condition to detect flat triangles: If the norm (length) of the cross product is close to zero, the vectors are collinear, making the triangle flat with no area. - Added detailed comments to explain the conditions for concave and flat triangles for better readability and maintainability.
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Correct the decomposition part of the polygon and resolve the following issues.
#2840