The files in this directory should replace the corresponding files in an irrlicht-1.5 distribution. They add a new function draw2DPolygon (with different parameters than the existing function with the same name). The new function is used to draw the speedometer, and the track display with the kart symbols on it. If an unpatched version of irrlicht is used, STK will still compile, but the above mentioned elements will be missing. We hope that this function (or a similar one) will be included in the next irrlicht release, making the use of a patched version unnecessary.