  We report on ongoing work to determine the pion-cloud contribution to the
electromagnetic $N\rightarrow\Delta$ transition form factors. The starting
point is an $SU(6)$ spin-flavor symmetric constituent-quark model with
instantaneous confinement that is augmented by dynamical pions which couple
directly to the quarks. This system is treated in a relativistically invariant
way within the framework of point-form quantum mechanics using a multichannel
formulation. The first step is to determine the electromagnetic form factors of
the bare particles that consist only of three quarks. These form factors are
basic ingredients for calculating the pion-cloud contributions. Already without
the pion cloud, electromagnetic nucleon and $N\rightarrow \Delta$ transition
form factors compare reasonably well with the data. By inclusion of the
pion-cloud contribution coming from the $\pi$-$N$ intermediate state the
reproduction of the data is further improved.
