How to apply pattern in curve surface

dear all, i need ur advice to apply pattern in curved surface. i need the pattern to follow the rail. what should i do first am i need to make the pattern in grasshopper first ? or you guys have advice.

your help its needed thankyou

study.3dm (13.5 MB)

Just a quick thought. Have you consider FlowAlongSrf?

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hai thanks for answering, i already do with flow along surface but it stretch

Is this what you want?

Array the surface with ZNumber=7 and Join the result into a single polysurface.
Create a base surface

hai david thankyou for you help its work!, but i want ask you, have advice if i use grasshopper?

Find the Grasshopper equivalents to Array and FlowAlongSrf.