+ * \param scaleFactors - optional scale factors to apply during extrusion; it's
+ * usage depends on \a scalesVariation parameter.
+ * \param scalesVariation - if \c True, \a scaleFactors are spread over all \a NbOfSteps,
+ otherwise \a scaleFactors[i] is applied to nodes at the i-th extrusion step.
+ * \param angles - optional rotation angles to apply during extrusion; it's
+ * usage depends on \a anglesVariation parameter.
+ * \param anglesVariation - if \c True, \a angles are spread over all \a NbOfSteps,
+ otherwise \a angle[i] is applied to nodes at the i-th extrusion step.