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According to the current Ear Clipping algorithm, point 2 is not within triangle 5, 9, 11, But point 2 is on the edge of 5-11. In this case, the triangle generated will cover the hole on the right.
I modified the
OnLeftSideOfLine2D
function so that it can determine whether it is left or right or on the side.Here are the results of the test.
And this is the FBX file that I tested.
double_hold.zip