Perspective correction is a process of interpolating texture coordinates prior to sampling a texture so that a polygon that is angled away from the camera is stretched correctly for the apparent depth of the polygon 透视修正是一种在对纹理进行采样之前对纹理坐标进行插值计算的过程，这样，对于偏离镜头方向一定角度的多边形，才能使其在视深范围内正确伸展。
