Hi Pilou,

re:
> how many significant digits can be admissible ?
> 7 max in the right decimal point box
> how many in the left part ?

Well it's a bit complicated, there is not really a fixed limit on that.

The way floating point mathematics works on the computer allows for a floating point number to have a very wide range of values but larger values have less precision. Also precision is greater the closer you are to the origin.

To keep things the most robust and avoid arithmetic precision problems it's generally good to keep numeric values say not larger than 5000 and not smaller than say 0.05 or so. But those are not hard limits.

- Michael

Hi Alex,

re:
> How did you get to show the control points?

They'll show up if you turn on points and then do a "Select all". The extreme size probably messes with the depth buffering in the regular display.

- Michael

>> To keep things the most robust and avoid arithmetic precision problems it's generally good to keep numeric values say not larger than 5000 and not smaller than say 0.05 or so.

Perfect !