I am trying to get this surface to be one surface. When I place a material on it shows as if there are separate surfaces, but I joined the curve before extruding it.
i think it a polysurface because of the lines you use to build it.
Can you share your file?
Curve Wall.3dm (60.9 KB)
Here you go
I am far from an expert, but I dragged both of these materials onto the surface and it worked. Maybe I am missing something?
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you have a polycurve and it gives you a polysurface, it the normal behaviour.
if you need a single surface you need to redraw the curve, for rendering purposes you don’t need to.
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When Join is used on multiple curves the result is a polycurve, not a single curve. As nachetz said, extruding a polycurve results in a polysurface.
You could create a single surface from the polysurface but it will have multi-knots and/or change shape.
Explode the polysurface
MergeSrf adjacent surfaces. Smooth=No and Round=0 results in no change in the shape but multi-knots where the internal surface edges were.
https://docs.mcneel.com/rhino/8/help/en-us/index.htm#commands/mergesrf.htm
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Thank you Nachetz, in twin motion, it was showing material in multiple directions.
you can do as @davidcockey explained step by step and get a clean srf or apply some mapping in Twinmotion (i suposse it uses uv mapping by default) and you have to unwrapp