left and right edges of the floor. Affine linear interpolation across that horizontal span will look correct because every pixel along that line is the same distance from the viewer.

Perspective correctness

' accounts for the vertices' positions in 3D space rather than simply interpolating coordinates in 2D screen space. While achieving the correct visual effect, perspective correct texturing is more expensive to calculate.

To perform perspective correction of the texture coordinates and , with being the

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