The disrespect is only for yourself because all I did was taking things from the tutorials and patching them up for a new patch.
So for three cameras to run in real time you have to open example 21 p example 1 and copy the grab patch to a new patcher. Copy three iof them for three cameras.
Then you want to mix using jit.xfade which takes two inputs. Put camera 1 and 2 into jit.xfade 1 and put the output and camera Three into the input of Jit.xfade 2. Connect jit.xfade 2 to a jit.pwindow and there is your mix.