Debug draw fidelity

[B_old]

Hi,

until recently I have been doing my own debug drawing for reasons I don't entirely remember. I now tried to switch over to an implementation of the debug draw interface provided by bullet. I hope to get more detailed and more accurate output that way.
However some shapes get drawn in a way that seems quite strange to me. A sphere is represented by a kind of cuboid and a cylinder is basically two lines.
Have I implemented something wrong or is it the way things are? Especially the cylinder-output is less useful than I hoped for and the "sphere" is kind of confusing.
In any case, my question is whether I'm seeing those result because a mistake of mine or if I maybe could improve it by a simple parameter.

[B_old]

Another thing I noticed is, that the color that gets passed to drawLine() sometimes seems to be in the [0, 1] range and sometimes [0, 255]. Is this intentional?