[NTG-context] randomize a color

[Taco Hoekwater]

Johan Sandblom wrote:
> The following produces one red square and two black ones, as opposed
> to one red and two randomly perturbed but also red ones I was hoping
> for. To my poor understanding this usage seems to comply with that
> defined in mp-tool.mp. What am I doing wrong.

hint: your redpart gets a random value between 0 and 0.0425

Cheers, taco