Grasshopper Select Surface Issue

Stadium Facade.3dm (7.9 MB)

Complete amateur here.

I am trying to apply a facade using Grasshopper but it will not let me select my rhino model as an object/surface. I have tried exploding etc but am at a real struggle.

Apologies if I am missing something obvious but I’d be very grateful for any help you could give me!

your object is a SubD, and keep in mind that you have a self-intersecting section here:

that ribbon continues for half the total circumference:

how did you generate the curves used to create the SubD? I think the trick to get the best result might be to do a step back and use earlier data to re-generate your shape from scratch

Your geometry is a Brep (or SubD?), not a surface. Now internalized, no need for R8 file.

Stadium (419.2 KB)

Thanks for the reply! I used a subD cylinder as my base and then scaled and refined geometry as required. I am very new to this all so appreciate your patience, I have seen another response below indicating I can apply a facade (I believe) but not using a surface. That’s where I have gone wrong! I have also gone back to before I started messing around with it so I have removed the section you have highlighted, thanks for pointing it out.

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Hi Joseph,

That’s great, thankyou so much. Sincerest apologies if it was outright stupid on my behalf,I had assumed I’d need to use a surface to apply a facade but clearly didn’t think it through.

Am I right in saying that I can apply a curved facade even though the base model is a SubD

You can take it one step further and get the bottom portion as a surface:

Stadium (423.6 KB)

I don’t know much about SubDs.

I got mixed up somehow trying to get the top portion (pink) as a single surface. Started trying to get a Sweep 2 surface but ended up with a loft, after flipping, chopping and sorting section curves. Green group in purple group. :sweat_smile:

Stadium (440.0 KB)

P.S. Improved. Not chopping the section curves (not sure why I did). Works fine in R7.

Stadium (444.1 KB)



Thank you so much for this. I have been following tutorials on youtube and trying to self teach, seems like you have it down!

I really appreciate your help and hope to stay in touch.