Irrlicht Engine

You could approximate your spline with line segments and draw them with driver->draw3DLine()

Skip

I know this thread has been here awhile, but I wanted to post a slight correction for the next person who stumbles upon a similar problem.

// Get the balls current rotation and convert it to a quaternion
vector3df euler = node->getRotation();
quaternion current(euler.X, euler.Y, euler.Z ...