x4 y4 z4 is the coordinate of the second control point.x3 圓 z3 is the coordinate of the first control point.x2 y2 z2 is the coordinate of the second point.x1 y1 z1 is the coordinate of the first point.See the Colours section for allowable colour numbers. colour is a number representing the colour of the part, typically this is 24 - the edge colour.The LDraw specification explains optional lines as follows: In the second visualiation, the vertical lines only occur at the side of the stud, giving a far prettier image. In the first visualization, the stud cylinders have vertical lines that delineate its side polygons, like a standard wireframe representation.
