[main12] 3 cameras, iterative placement, the optimum is not found
[main12_2] two cameras are placed on two parametric lines, contour is plotted
[main12_3] three cameras are placed on three parametric lines;
fmincon is applied;
steps and the resulting positions are plotted;
[main12_3] optimal positions only inside their line segments, not at a vertex
[main12_3] outputfun() only stores the positions and measure values through the iterations, plot is performed after all calculations
[main12_3] four camera optimized parallel, segments and plot generated with for loops
[main12_3] other 4 segments defined
[main12_4] measure calculated on an ndgrid defined on the main12_3 segments