Begin / End curve ?

 From:  Frenchy Pilou (PILOU)
4237.16 In reply to 4237.14 
< it's not a good practice for a good clean and proper model structure.
yes for construction of buildings but for grafic that is no importance :)

"+" = more :)

green start button was for make a difference with white buttons default who can be present on the same time on the screen ;)
So maybe your script can draw a green point ? :)