用maya制造环形跑道模型和材质（英文）

　　(13) At this point you should now have all the relevant curves in which to create some surfaces! At this point is a good idea to start organising your workflow. My favourite way is using Maya’s layers found in the Layer Editor. Set up a new layer called “curves” and add the curves to the layer.

　　

(14) Moving around the track select the two curves that make up each surface and use the Loft command found in the Surfaces menu to create a lofted NURBs surface. Always select the curve on the right first to ensure the correct surface direction. Turning on backface culling in the viewport Shading menu will help.

　　

　　(15) Now we have 3 types of surface, so we need the textures to fit the surfaces that all join together smoothly. For this create a tarmac texture (256x256pixels), a white line on tarmac texture (16x256), and a grass with tarmac edge texture (128x256). The textures all need to join together with no seam, and be tileable vertically.