Aleksandar Thanks for this - this is what I was thinking, but it ended up putting the drain in a zigzag path based on the adjacent rail heights I have done what you said only with a bit of a change. I have used a horizontal point control on this drain point to constrain it to the centre of the platform. This means that only one of the 1:80 slopes is solved in the template, as the drain point is overconstrained. However it give me enough to work on. What I would love is to have a 1:80 (shallowest) and 1:40 (steepest) gradient line as end conditions and solve for the intersection of them based on priority. Or have them solve for the intersection area of all 4 of the slopes to give me an area that any drain CL can be placed.
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