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Font antialiasing will not work properly when characters are extremely distorted in perspective render mode or when the blackbox of the character intersects z=0 plane. This is because quadric splines are converted into another quadric spline on screen, rather than its correct perspective representation, and the outlines are not trimmed as for now when converted into the screen space.

To fix this I'll need to find a way to calculate the minimal distance between the perspective projections of a quadric spline and a point.

Will look into it