使用产品：iserver 9D
问题详细描述：对我自己的模型使用分层设色配置后，模型没有产生渐变色效果，同样的代码对官方的倾斜摄影模型使用分层设色后，可以产生渐变色，请问分层设色对模型有什么要求，如何将模型转换成符合要求的形式？
模型缓存配置文件
1.10000 OSGBCacheFile Batch GLOBAL QuadTree -179769313486231570000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.000000 179769313486231570000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.000000 Normal 0.0002215331196571032 4513 305.75 117.752151554560640 39.115108881281792 21.00000 117.7323639495512 39.133325804811292 117.7719391595701 39.096891957752291 ./Tile_-14248_42871_0000/Tile_-14248_42871_0000.osgb -123.527773 1732.778576 5.935374 43.540500 ./Tile_-14248_42872_0000/Tile_-14248_42872_0000.osgb 109.013555 1788.221826 5.818374 116.530071 ./Tile_-14247_42868_0000/Tile_-14247_42868_0000.osgb -836.858749 1556.618428 1.255149 6.411886 ./Tile_-14247_42867_0000/Tile_-14247_42867_0000.osgb -1130.620998 1469.475682 19.771133 175.216621 ./Tile_-14247_42869_0000/Tile_-14247_42869_0000.osgb -683.844186 1463.342919 5.321335 119.604101 ./Tile_-14248_42873_0000/Tile_-14248_42873_0000.osgb 252.402110 1829.284334 6.265719 148.635979 ./Tile_-14247_42873_0000/Tile_-14247_42873_0000.osgb 240.147041 1568.121415 10.389378 198.874155 ./Tile_-14247_42872_0000/Tile_-14247_42872_0000.osgb 65.898387 1587.748512 15.250509 243.919804 ./Tile_-14247_42866_0000/Tile_-14247_42866_0000.osgb -1362.386875 1525.565164 28.283892 187.969121 ./Tile_-14246_42865_0000/Tile_-14246_42865_0000.osgb -1482.436303 1174.483344 6.844865 16.706087 ./Tile_-14246_42869_0000/Tile_-14246_42869_0000.osgb -681.673141 1320.836624 17.480841 156.990566 ./Tile_-14246_42873_0000/Tile_-14246_42873_0000.osgb 290.202694 1259.242181 23.120912 201.464287 ./Tile_-14247_42870_0000/Tile_-14247_42870_0000.osgb -410.492119 1494.087732 7.941155 150.211526 ./Tile_-14247_42871_0000/Tile_-14247_42871_0000.osgb -181.161333 1564.872691 7.703893 203.162361 ./Tile_-14245_42866_0000/Tile_-14245_42866_0000.osgb -1433.224128 1058.129642 9.682871 92.647315 ./Tile_-14246_42866_0000/Tile_-14246_42866_0000.osgb -1356.280372 1235.947969 23.671363 232.239392 ./Tile_-14246_42868_0000/Tile_-14246_42868_0000.osgb -865.679096 1204.813183 19.365809 204.949337
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