Hello everybody: I want creating a spline along exisiting line cell to catch up. However the command 'splc' only operating interactinvely on screen. There is no other command wayaround. I plan to run a loop to chase up a line. What I doing this is because 'splin chase' functioning very badly, could not go along slightly charpen curves.

I don't think you can do this, I asked the same question about two years ago at cd-adapco support, and I was told it couldn't be done. However things may have changed!

It is done simple.

The use of a negative vertex number in the vertex definition list provides for slope discontinuity at the location of the (absolute value) of the vertex. Use it to build you slightly charpen curves.