Defines/NNGraphicsNDefineNGraphics|FLAT_MAP_HEIGHTMAP_SPLINES_STARTNGraphics|FLAT_MAP_HEIGHTMAP_SPLINES_STARTloading_screen/common/defines/graphic/00_graphics.txt:132Splines (rivers and roads) use an unsigned distance field. 0.0 on the spline, 1.0 far away from the splineDefinitionloading_screen/common/defines/graphic/00_graphics.txt:1320.4