These options appear in the Paint Effects Brush Settings window, and the Attribute Editor for any brush node.
The number of points in the circle that is swept along the tube.
The number of cross sections per segment of the tube.
Cull away facing triangles.
Light each pixel, as opposed to each vertex.
This adds end cap geometry to tubes when using the Mesh Brush Type.
This affects the lighting of the object and makes the edges around tubes hard when using the Mesh Brush Type. For example, if the tube sections are set to 4 and Hard Edges is turned on, it will make the tube shade as if the 4 sides are flat, rather than trying to simulate a rounded tube. For bends in the direction of the tube, for example, due to changes in the Width Scale, the bend angle across a given must be sufficiently large to make the angle hard. The number of segments used can affect whether a given region on the tube becomes hard edged or not. This attribute adjusts the normals used for shading and does not alter the shape of the tube. This is off by default.