Camera in correspondence with jit.gl.sketch

He all,

I'm working on a project where I draw a line between four points using jit.gl.sketch
I want to redraw the square a few times per second a little step forward (z-translation) and keep the camera focussed on that newly drawn square.
Now I have a few problems;
the camera seems to be on an angle in comparance to the camera (thats where I get my four points which create the square from)
Somehow the square doesn't want to be redrawn in a z-translation.

To make it a bit clearer, I want to create some sort of a tunnel effect. a section of square behind each other while the camera keep foccussing on the front square.

Hope someone can help me,
Let me know if you need to see the patch
Rik