用maya制造环形跑道模型和材质（英文）

　　

(20) The new polygon surfaces should match one to one between polygon and surface span. At this point hide the NURBs surfaces away in a layer. Select all the polygon objects and combine them all, also merging the vertices using the tools in the Polygons, and Edit Polygons menus. You now have the completed polygonal track ribbon!

　　

(21) Building the track in such a modular way gives a major advantage, in retaining the correct UVs. A good example of this is adding track edge kerbing on corners. Simply using the grass verge texture, and add some kerbs down one side. Et voila, when the texture is assigned to the polys it tiles beautifully!

　　

　　(22) If you require any height tweaking – usually the result of playtesting the circuit, this can be added using the Wire Tool found in the Deform menu. This is especially useful if you want to add camber. Make the track ribbon Live by selecting the red magnet button and draw on two curves either side of the track making sure you start and end the curves a good distance from the area you wish modified.