I’d like to use the Draw Spline tool as seen in the editor to freely place knots and splines with a realtime preview within runtime so that the player can place pipes, roads, powerlines, etc. with a preview. I’ve been exploring the API in the docs but it doesn’t seem to help my situation, as far as I can see.
If you have editor-only code then it needs to be lifted out of the editor-only area of your project and made to work in the main area.
If this draw-spline tool uses editor input / output / visualization, you need to refactor it to use runtime equivalents, which you may need to write yourself, or at least wrap and present it the way the editor expects it.
If this is Unity’s code be sure to check the Terms of Service about rewriting and repackaging it in your own game(s).